Linked List of Useful Libraries

Just an a collection libraries starred during some years of Android Development. Here is the definitely list of android Open Source libraries

List Menu(#list-menu)

Coming Soon...!

1. Personalized Views

Customed View. include ListView, ActionBar, Menu, ViewPager, Gallery, GridView, ImageView, ProgressBar, Dialog, Toast, EditText, TableView, Activity Animation and so on。

1. ListView

android-pulltorefresh
Provide a reusable Pull to Refresh widget for Android, support ListView, ExpandableListView, GridView, WebView, ScrollView, HorizontalScrollView, ViewPager, support pulling Down from the top, and Pulling Up from the bottom and so on.
Project Address: https://github.com/chrisbanes/Android-PullToRefresh
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/pull-to-refreshview-demo.apk?raw=true
Similar App: Sina Weibo Pages
android-pulltorefresh-listview
Pull to refresh listView for android, There is some bug for this
Project Address: https://github.com/johannilsson/android-pulltorefresh
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/pull-to-refresh-listview-demo.apk?raw=true
android-Ultra-Pull-to-Refresh
It's a replacement for the deprecated pull to refresh solution. It can contain any view you want. It's easy to use and more powerful than SwipeRefreshLayout. It's well designed, you can customize the UI effect you want as easy as adding a headview to ListView. Support API LEVEL >= 8 Project Address: https://github.com/liaohuqiu/android-Ultra-Pull-To-Refresh
Demo Apk: https://github.com/liaohuqiu/android-Ultra-Pull-To-Refresh/blob/master/ptr-demo/target/ultra-ptr-demo.apk?raw=true

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DropDownListView
Pull to refresh and load more when on bottom listView for android
Project Address: https://github.com/Trinea/AndroidCommon
Demo Apk: https://play.google.com/store/apps/details?id=cn.trinea.android.demo
Document: http://www.trinea.cn/android/dropdown-to-refresh-and-bottom-load-more-listview/
DragSortListView
Android ListView with drag and drop reordering.
Project Address: https://github.com/bauerca/drag-sort-listview
Demo Apk: https://play.google.com/store/apps/details?id=com.mobeta.android.demodslv
Similar App: Wordpress Android
SwipeListView
An Android List View implementation with support for drawable cells and many other swipe related features
Project Address: https://github.com/47deg/android-swipelistview
Demo Apk: https://play.google.com/store/apps/details?id=com.fortysevendeg.android.swipelistview
Similar App: 微信
Android-SwipeToDismiss
Android swipe to dismiss listView
Project Address: https://github.com/romannurik/Android-SwipeToDismiss
Demo Apk: https://github.com/JakeWharton/SwipeToDismissNOA/SwipeToDismissNOA.apk/qr_code
StickyListHeaders
An android library for section headers of listView that stick to the top
Project Address: https://github.com/emilsjolander/StickyListHeaders
Similar App: Contacts app of Android 4.0 Ice Cream Sandwich
Renderings:
pinned-section-listview
Easy to use ListView with pinned sections for Android. Pinned section is a header view which sticks to the top of the list until at least one item of that section is visible.
Project Address: https://github.com/beworker/pinned-section-listview
Renderings:
PinnedHeaderListView
A ListView with pinned section headers for Android
Project Address: https://github.com/JimiSmith/PinnedHeaderListView
QuickReturnHeader
A ListView/ScrollView header that hides when scrolling down and reappears immediately when scrolling up, regardless of how far down the list we've gone.
Project Address: https://github.com/ManuelPeinado/QuickReturnHeader
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/quick-return-header-demo.apk?raw=true
Similar App: google plus
IndexableListView
iPhone like fast scroll ListView on Android with non-alphabetic overlays
Project Address: https://github.com/woozzu/IndexableListView
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/indexable-listview.apk?raw=true
Similar App: Weichat contact
CustomFastScrollView
A FastScrollView with non-alphabetic overlays
Project Address: https://github.com/nolanlawson/CustomFastScrollViewDemo
Renderings:
Android-ScrollBarPanel
Android-ScrollBarPanel allows to attach a View to a scroll indicator like it's done in Path 2.0
Project Address: https://github.com/rno/Android-ScrollBarPanel
Renderings:
SlideExpandableListView
A better ExpandableListView, with animated expandable views for each list item
Project Address: https://github.com/tjerkw/Android-SlideExpandableListView
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/slide-expandable-listView-demo.apk?raw=true
JazzyListView
JazzyListView is an extension of ListView designed to animate list item views as they become visible. There are a number of pre-built, bundled effects that can be used by setting the effect in code or an XML layout attribute, like grow, cards, curl, wave, flip, fly. Also, it is possible to use a custom effect by implementing a JazzyEffect.
Project Address: https://github.com/twotoasters/JazzyListView
Demo Apk: https://play.google.com/store/apps/details?id=com.twotoasters.jazzylistview.sample
ListViewAnimations
An Android library which allows developers to easily add animations to ListView items
Project Address: https://github.com/nhaarman/ListViewAnimations
Demo Apk: https://play.google.com/store/apps/details?id=com.haarman.listviewanimations
Similar App: Google plus, Google Now, Ultimate, Light Flow Lite, TreinVerkeer, Running Coach, Pearl Jam Lyrics, Calorie Chart, Car Hire, Super BART, DK FlashCards, Counter Plus, Voorlees Verhaaltjes 2.0
DevsmartLib-Android
A Horizontal ListView for Android
Project Address: https://github.com/dinocore1/DevsmartLib-Android
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/horizontal-listview-demo.apk?raw=true
HorizontalVariableListView
Horizontal list view for Android which allows variable items widths
Project Address: https://github.com/sephiroth74/HorizontalVariableListView
LinearListView
Android library that allows you to bind a LinearLayout with a ListAdapter.
Project Address: https://github.com/frankiesardo/LinearListView
MultiChoiceAdapter
A ListView adapter with support for multiple choice modal selection
Project Address: https://github.com/ManuelPeinado/MultiChoiceAdapter
Demo Apk: https://play.google.com/store/apps/details?id=com.manuelpeinado.multichoiceadapter.demo
EnhancedListView
An Android ListView with enhanced functionality (e.g. Swipe To Dismiss and Undo)
Project Address: https://github.com/timroes/EnhancedListView
Demo Apk: https://play.google.com/store/apps/details?id=de.timroes.android.listviewdemo&rdid=de.timroes.android.listviewdemo
ListBuddies
Android library of a pair of auto-scroll circular parallax ListViews like the ones on the expedia app home page.
Project Address: https://github.com/jpardogo/ListBuddies
Demo Apk: https://play.google.com/store/apps/details?id=com.jpardogo.android.listbuddies
Renderings:
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2. ActionBar

ActionBarSherlock
Action bar implementation which uses the native action bar on Android 4.0+ and a custom implementation on pre-4.0 through a single API and theme.
Project Address: https://github.com/JakeWharton/ActionBarSherlock
Demo Apk: https://play.google.com/store/apps/details?id=com.actionbarsherlock.sample.demos
ActionBar-PullToRefresh
ActionBar-PullToRefresh provides an easy way to add a modern version of the pull-to-refresh interaction to your application.
Project Address: https://github.com/chrisbanes/ActionBar-PullToRefresh
Demo Apk: https://play.google.com/store/apps/details?id=uk.co.senab.actionbarpulltorefresh.samples.stock
Similar App: Gmail，Google plus
FadingActionBar
Android library implementing a fading effect for the action bar, similar to the one found in the Play Music app
Project Address: https://github.com/ManuelPeinado/FadingActionBar
Demo Apk: https://play.google.com/store/apps/details?id=com.manuelpeinado.fadingactionbar.demo
Similar App: google music
NotBoringActionBar
Auto dismis actionbar when content scroll down
Project Address: https://github.com/flavienlaurent/NotBoringActionBar
Demo Apk: http://flavienlaurent.com/blog/2013/11/20/making-your-action-bar-not-boring/
Similar App: google music
RefreshActionItem
An action bar item which acts both as a refresh button and as a progress indicator
Project Address: https://github.com/ManuelPeinado/RefreshActionItem
Demo Apk: https://play.google.com/store/apps/details?id=com.manuelpeinado.refreshactionitem.demo
Similar App: The New York Times，DevAppsDirect.
GlassActionBar
An Android library which implements a glass-like effect for the action bar
Project Address: https://github.com/ManuelPeinado/GlassActionBar
Demo Apk: https://play.google.com/store/apps/details?id=com.manuelpeinado.glassactionbardemo
Similar App: google music
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3. Menu

MenuDrawer
A slide-out menu implementation, which allows users to navigate between views in your app. Most commonly the menu is revealed by either dragging the edge of the screen, or clicking the 'up' button in the action bar. It support content below or up to menu when compare to SlidingMenu.
Project Address: https://github.com/SimonVT/android-menudrawer
Demo Apk: http://simonvt.github.io/android-menudrawer/
Similar App: Gmail, Google Music
SlidingMenu
An Android library that allows you to easily create applications with slide-in menus. It support animation when compare to MenuDrawer.
Project Address: https://github.com/jfeinstein10/SlidingMenu
Demo Apk: https://play.google.com/store/apps/details?id=com.slidingmenu.example
Similar App: Foursquare, LinkedIn, Zappos, Rdio, Evernote Food, Plume, VLC for Android, ESPN ScoreCenter, MLS MatchDay, 9GAG, Wunderlist 2, The Verge, MTG Familiar, Mantano Reader, Falcon Pro (BETA), MW3 Barracks
ArcMenu
An android custom view which looks like the menu in Path 2.0 for iOS.
Project Address: https://github.com/daCapricorn/ArcMenu
Similar App: Path
Renderings:
android-satellite-menu
Android Satellite Menu
Project Address: https://github.com/siyamed/android-satellite-menu
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/satellite-menu-demo.apk?raw=true
Similar App: Path
radial-menu-widget
A radial (pie) menu for Android
Project Address: https://code.google.com/p/radial-menu-widget/
Renderings: http://farm8.staticflickr.com/7377/11621125154_d1773c2dcc_o.jpg
Android Wheel Menu
Circular menu widget for Android.
Project Address: https://github.com/anupcowkur/Android-Wheel-Menu
Renderings:
FoldingNavigationDrawer
Folding navigation drawer for android.
Project Address: https://github.com/tibi1712/FoldingNavigationDrawer-Android
Demo Apk: https://play.google.com/store/apps/details?id=com.ptr.folding.sample
Renderings:
AndroidResideMenu
The idea of ResideMenu is from Dribbble 1 and 2 likes iOS ResideMenu
Project Address: https://github.com/SpecialCyCi/AndroidResideMenu
Renderings:
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4. ViewPager Gallery

Android-ViewPagerIndicator
Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock. Originally based on Patrik Åkerfeldt's ViewFlow.
Project Address: https://github.com/JakeWharton/Android-ViewPagerIndicator
Demo Apk: https://play.google.com/store/apps/details?id=com.viewpagerindicator.sample
JazzyViewPager
An easy to use ViewPager that adds an awesome set of custom swiping animations. Just change your ViewPagers to JazzyViewPagers and you'return good to go!
Project Address: https://github.com/jfeinstein10/JazzyViewPager
Demo Apk: https://github.com/jfeinstein10/JazzyViewPager/blob/master/JazzyViewPager.apk?raw=true
Android-DirectionalViewPager
ViewPager class that supports paging both vertically and horizontally as well as changing between the two at runtime.
Project Address: https://github.com/JakeWharton/Android-DirectionalViewPager
Demo Apk: https://market.android.com/details?id=com.directionalviewpager.sample
android-pulltorefresh
Provide a reusable Pull to Refresh widget for Android, support ListView, ExpandableListView, GridView, WebView, ScrollView, HorizontalScrollView, ViewPager, support pulling Down from the top, and Pulling Up from the bottom and so on.
Project Address: https://github.com/chrisbanes/Android-PullToRefresh
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/pull-to-refreshview-demo.apk?raw=true
FancyCoverFlow
FancyCoverFlow is a flexible Android widget providing out of the box view transformations to give your app a unique look and feel.
Project Address: https://github.com/davidschreiber/FancyCoverFlow
Demo Apk: https://play.google.com/store/apps/details?id=at.technikum.mti.fancycoverflow.samples
Renderings:
AndroidTouchGallery
Android widget for gallery, using viewpager. Allow pinch zoom and drag for images by url. Widget allows use it in Android > 2.0
Project Address: https://github.com/Dreddik/AndroidTouchGallery
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/touch-gallery-demo.apk?raw=true
Android Auto Scroll ViewPager
Android Auto scroll ViewPager or ViewPager in ViewPager
Project Address: https://github.com/Trinea/android-auto-scroll-view-pager
Demo Apk: https://play.google.com/store/apps/details?id=cn.trinea.android.demo
Document: http://www.trinea.cn/android/auto-scroll-view-pager/
Salvage view
Generic view recycler and ViewPager PagerAdapter implementation.
Project Address: https://github.com/JakeWharton/salvage
Android PagerSlidingTabStrip
An interactive indicator to navigate between the different pages of a ViewPager
Project Address: https://github.com/astuetz/PagerSlidingTabStrip
Demo Apk: https://play.google.com/store/apps/details?id=com.astuetz.viewpager.extensions.sample
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5. GridView

StaggeredGridView
A modified version of Android's experimental StaggeredGridView. Includes own OnItemClickListener and OnItemLongClickListener, selector, and fixed position restore. contains cache, extends from ViewGroup
Project Address: https://github.com/maurycyw/StaggeredGridView
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/staggered-gridview-demo.apk?raw=true
Similar App: Pinterest
AndroidStaggeredGrid
An Android staggered grid view which supports multiple columns with rows of varying sizes. extends from AbsListView
Project Address: https://github.com/etsy/AndroidStaggeredGrid
Similar App: Pinterest
PinterestLikeAdapterView
An Android multi column list view like Pinterest. allow pull to refresh.
Project Address: https://github.com/GDG-Korea/PinterestLikeAdapterView
Similar App: Pinterest
DraggableGridView
A drag-and-drop scrolling grid view for Android, extends from ViewGroup. It can swich from up to bottom, If you want switch from left screen to right please use PagedDragDropGrid below
Project Address: https://github.com/thquinn/DraggableGridView
Demo Apk: https://github.com/thquinn/DraggableGridView/blob/master/bin/DraggableGridViewSample.apk?raw=true
StickyGridHeaders
StickyGridHeaders is an Android library that provides a GridView that shows items in sections with headers. By default the section headers stick to the top like the People app in Android 4.x but this can be turned off.
Project Address: https://github.com/TonicArtos/StickyGridHeaders
Renderings:
PagedDragDropGrid
An Android ViewGroup that implements a paged grid with drag'n'drop moveable items. It can swich from left screen to right, If you want switch from up to bottom please use DraggableGridView above
Project Address: https://github.com/mrKlar/PagedDragDropGrid
Demo视频：http://youtu.be/FYTSRfthSuQ
Android-DraggableGridViewPager
Zaker style grid view pager, support dragging & rearrange, using as zaker's main screen. Project Address: https://github.com/zzhouj/Android-DraggableGridViewPager
Demo Apk: https://github.com/Trinea/trinea-download/blob/master/draggable-grid-viewpager-demo.apk?raw=true
GridView with Header and Footer
Same with ListView. It allows you call addHeaderView(), addFooterView to add views to GridView.
Project Address：https://github.com/liaohuqiu/android-GridViewWithHeaderAndFooter
Renderings：
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6. ImageView

PhotoView
Implementation of ImageView for Android that supports zooming, by various touch gestures, like multi-touch and double-tap. Works perfectly when using used in a scrolling parent (such as ViewPager). Allows the application to be notified when the displayed Matrix has changed. Useful for when you need to update your UI based on the current zoom/scroll position.
Project Address: https://github.com/chrisbanes/PhotoView
Demo Apk: https://play.google.com/store/apps/details?id=uk.co.senab.photoview.sample
Similar App: photup
android-gif-drawable
Views and Drawable for displaying animated GIFs on Android. Bundled GIFLib via JNI is used to render frames. This way should be more efficient than WebView or Movie classes. Animation starts automatically and run only if View with attached GifDrawable is visible.
Project Address: https://github.com/koral--/android-gif-drawable
ImageViewEx
Extension of Android's ImageView that supports animated GIFs and includes a better density management.
Project Address: https://github.com/frapontillo/ImageViewEx
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/imageviewex-demo.apk?raw=true
RoundedImageView
A fast ImageView that supports rounded corners and ovals or circles
Project Address: https://github.com/vinc3m1/RoundedImageView
Renderings:
SelectableRoundedImageView
ImageView that supports different radiuses on each corner. It also supports oval(and circle) shape and border.
Project Address: https://github.com/pungrue26/SelectableRoundedImageView
Demo Apk: https://play.google.com/store/apps/details?id=com.joooonho
Renderings:
ColorArt
iTunes 11-style color matching code for Android, is a library that uses an image to create a themed image/text display
Project Address: https://github.com/MichaelEvans/ColorArt
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/color-art-demo.apk?raw=true
CircleImageView
A circular ImageView for Android
Project Address: https://github.com/hdodenhof/CircleImageView
Renderings:
ImageViewZoom
Android ImageView widget with zoom and pan capabilities
Project Address: https://github.com/sephiroth74/ImageViewZoom
Similar App: https://play.google.com/store/apps/details?id=com.aviary.android.feather
KenBurnsView
Android library that provides an extension to ImageView that creates an immersive experience by animating its drawable using the Ken Burns Effect.
Project Address: https://github.com/flavioarfaria/KenBurnsView
CustomShapeImageView
Custom shape ImageView using PorterDuffXfermode with paint shapes and SVGs.
Project Address: https://github.com/MostafaGazar/CustomShapeImageView
Renderings:
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7. ProgressBar

SmoothProgressBar
A small Android library allowing you to have a smooth and customizable horizontal indeterminate ProgressBar
Project Address: https://github.com/castorflex/SmoothProgressBar
Demo Apk: https://play.google.com/store/apps/details?id=fr.castorflex.android.smoothprogressbar.sample
ProgressWheel
A progress wheel for android, intended for use instead of the standard progress bar.
Project Address: https://github.com/Todd-Davies/ProgressWheel
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/progress-wheel-demo.apk?raw=true
android-square-progressbar
A progressbar which go's around an image.
Project Address: https://github.com/mrwonderman/android-square-progressbar
Demo Apk: https://play.google.com/store/apps/details?id=net.yscs.android.square_progressbar_example
Similar App: square
Renderings:
HoloCircularProgressBar
HoloCircularProgressBar is a Custom View implementation for Android you might know from the Android Clock App from Android 4.1
Project Address: https://github.com/passsy/android-HoloCircularProgressBar
Similar App: Android4.1 Clock App
Renderings:
ProgressButton
A custom progress indicator with a tiny footprint.
Project Address: https://github.com/f2prateek/progressbutton
Document: http://f2prateek.com/progressbutton/
Renderings:
GoogleProgressBar
Android library to display different kind of google related animations for the progressBar.
Project Address: https://github.com/jpardogo/GoogleProgressBar
Renderings:
TH-ProgressButton
Circular progress View button inspired by FFCircularProgressView
Project Address: https://github.com/torryharris/TH-ProgressButton
Renderings:
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8. TextView

include TextView and other views extend TextView, like EditText, Button, RadioButton and so on

android-flowtextview
A TextView for Android which supports text wrapping around other views
Project Address: https://code.google.com/p/android-flowtextview/
Renderings: http://i949.photobucket.com/albums/ad332/vostroman1500/1.png
Android Form EditText
Android form edit text is an extension of EditText that brings data validation facilities to the edittext.
Project Address: https://github.com/vekexasia/android-edittext-validator
Demo Apk: https://play.google.com/store/apps/details?id=com.andreabaccega.edittextformexample
Emojicon
A library to show emoji in TextView, EditText (like WhatsApp) for Android
Project Address: https://github.com/rockerhieu/emojicon
Document: http://rockerhieu.com/emojicon/
android-circlebutton
Circle button widget for Android, extend from ImageView actually
Project Address: https://github.com/markushi/android-circlebutton
Demo Apk: https://github.com/markushi/android-circlebutton/blob/master/example/example.apk
Segmented Radio Buttons for Android
Android implementation of iPhone's segmented control
Project Address: https://github.com/vinc3m1/android-segmentedradiobutton
Demo Apk: https://github.com/thquinn/DraggableGridView/blob/master/bin/DraggableGridViewSample.apk?raw=true
Renderings:
Chips EditText Library
Chips EditText, Token EditText, Bubble EditText, Spannable EditText and etc.. There are many names of this control. Implement by SpannableStringBuilder actually
Project Address: https://github.com/kpbird/chips-edittext-library
Demo Apk: https://github.com/kpbird/chips-edittext-library/tree/master/ChipsEditTextDemo/bin
AutoFitTextView
A TextView that automatically resizes text to fit perfectly within its bounds.
Project Address: https://github.com/grantland/android-autofittextview
Shimmer for Android
An Android TextView with a shimmering effect
Project Address: https://github.com/RomainPiel/Shimmer-android
Titanic
Android experiment showing a sinking TextView
Project Address: https://github.com/RomainPiel/Titanic
Renderings:
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9. Others

achartengine
AChartEngine is a charting library for Android applications. It currently supports the following chart types: line chart, area chart, scatter chart, time chart, bar chart, pie chart, bubble chart, doughnut chart, range (high-low) bar chart, dial chart / gauge, combined (any combination of line, cubic line, scatter, bar, range bar, bubble) chart, cubic line chart and so on.
Project Address: https://code.google.com/p/achartengine/
Official Website: http://www.achartengine.org/
Renderings:
http://www.achartengine.org/dimages/sales_line_and_area_chart.png
http://www.achartengine.org/dimages/temperature_range_chart.png
http://www.achartengine.org/dimages/combined_chart.png
http://www.achartengine.org/dimages/budget_chart.png
Similar App: Wordpress Android，Google Analytics
GraphView
Android Graph Library for creating zoomable and scrollable line and bar graphs.
Project Address: https://github.com/jjoe64/GraphView
Demo Project: https://github.com/jjoe64/GraphView-Demos
Demo Apk: https://play.google.com/store/apps/details?id=com.sothree.umano
Similar App: Wordpress Android，Google Analytics
android-flip
A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
Project Address: https://github.com/openaphid/android-flip
Demo Apk: https://github.com/openaphid/android-flip/blob/master/FlipView/Demo/APK/Aphid-FlipView-Demo.apk?raw=true
Similar App: flipboard
FlipImageView
Small android lib allowing you to make a flip imageview easily, by extending FlipImageView.
Project Address: https://github.com/castorflex/FlipImageView
Demo Apk: https://play.google.com/store/apps/details?id=fr.castorflex.android.flipimageview
SwipeBackLayout
An Android library that help you to build app with swipe back gesture.
Project Address: https://github.com/Issacw0ng/SwipeBackLayout
Demo Apk: https://play.google.com/store/apps/details?id=me.imid.swipebacklayout.demo
Similar App: Zhihu
Cards-UI
A library that allows you to easily mimic Google Play's card layout on Android.
Project Address: https://github.com/afollestad/Cards-UI
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/cards-ui-demo.apk?raw=true
cardslib
Card Library provides an easy way to display a UI Card in your Android app. You can display single cards, list of cards and grid or staggered grid of Cards.
Project Address: https://github.com/gabrielemariotti/cardslib
Demo Apk: https://play.google.com/store/apps/details?id=it.gmariotti.cardslib.demo
android-styled-dialogs
A simple library for styling Android dialogs in the Holo theme. It also removes boilerplate code for displaying simple dialogs.
Project Address: https://github.com/inmite/android-styled-dialogs
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/styled-dialogs-demo.apk?raw=true
Crouton
Context sensitive notifications for Android, like toast. include style like alert, comfirm, info and click to dismiss, allow to set time of diaplay and customed view
Project Address: https://github.com/keyboardsurfer/Crouton
Demo Apk: http://play.google.com/store/apps/details?id=de.keyboardsurfer.app.demo.crouton
supertooltips
SuperToolTips is an Open Source Android library that allows developers to easily create Tool Tips for views.
Project Address: https://github.com/nhaarman/supertooltips
Demo Apk: https://play.google.com/store/apps/details?id=com.haarman.supertooltips
Android ViewBadger
A simple way to "badge" any given Android view at runtime without having to cater for it in layout
Project Address: https://github.com/jgilfelt/android-viewbadger
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/android-viewbadger.apk?raw=true
Renderings: https://github-camo.global.ssl.fastly.net/a705a3e88c75ae2394943bd7c56f725697616ea8/687474703a2f2f7777772e6a65666667696c66656c742e636f6d2f766965776261646765722f76622d31612e706e67
Android Sliding Up Panel
This library provides a simple way to add a draggable sliding up panel (popularized by Google Music, Google Maps and Rdio) to your Android application. Umano Team <3 Open Source.
Project Address: https://github.com/umano/AndroidSlidingUpPanel
Demo Apk: https://play.google.com/store/apps/details?id=com.sothree.umano
Similar App: Google Music
android-times-square
Standalone Android widget for picking a single date from a calendar view.
Project Address: https://github.com/square/android-times-square
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/times-square-demo.apk?raw=true
android-calendar-card
Android calendar view (like card)
Project Address: https://github.com/kenumir/android-calendar-card
Demo Apk: https://play.google.com/store/apps/details?id=com.wt.calendarcardsample
Renderings:
ColorPickerView
A simple yet beautiful color picker component for Android.
Project Address: https://code.google.com/p/color-picker-view/
Renderings:
HoloColorPicker
An Android Holo themed colorpicker
Project Address: https://github.com/LarsWerkman/HoloColorPicker
Demo Apk: https://docs.google.com/file/d/0BwclyDTlLrdXRzVnTGJvTlRfU2s/edit
AndroidWheel
Custom wheel widget for android
Project Address: https://github.com/sephiroth74/AndroidWheel
Renderings:
TableFixHeaders
Android library that implements a table with fixed headers.
Project Address: https://github.com/InQBarna/TableFixHeaders
Demo Apk: http://bit.ly/13buAIq
UITableView
Library and example project on how to use the UITableView component
Project Address: https://github.com/thiagolocatelli/android-uitableview
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/ui-tableview-demo.apk?raw=true
ATableView
Create iOS-like tables (UITableView) for Android, using UIKit object model
Project Address: https://github.com/dmacosta/ATableView
Demo Apk: https://play.google.com/store/apps/details?id=com.nakardo.atableview.demo
UndoBar
The UI component for Android advanced UI pattern undo-bar, used in Gmail app
Project Address: https://github.com/soarcn/UndoBar
Renderings:
Inscription
Inscription is an open source library to display information about your Android app, like info of change or new feature
Project Address: https://github.com/MartinvanZ/Inscription
ActivityTransition
An android project presenting some transitions you can use between activities, like fade, flip, fly into and so on
Project Address: https://github.com/ophilbert/ActivityTransition
Demo Apk： https://github.com/jfeinstein10/JazzyViewPager/blob/master/JazzyViewPager.apk?raw=true
GlowPadBackport
A backport of the Android 4.2 GlowPadView that works on the SDK on API levels 4+
Project Address: https://github.com/rock3r/GlowPadBackport
Demo Apk: https://play.google.com/store/apps/details?id=net.sebastianopoggi.samples.ui.GlowPadSample
Renderings:
GlowPadView
GlowPadView for Android is a great library to implement Google's lockscreen and new alarmclock style.
Project Address: https://github.com/nadavfima/GlowPadView
Renderings: https://raw.github.com/nadavfima/GlowPadView/master/example.png
android-lockpattern
Lockpattern activity for Android
Project Address: https://code.google.com/p/android-lockpattern/
Demo Apk: https://play.google.com/store/apps/details?id=group.pals.android.lib.ui.lockpattern.demo
Document: https://code.google.com/p/android-lockpattern/wiki/QuickUse
PatternLock
Yet another pattern lock library for Android
Project Address：https://github.com/DreaminginCodeZH/PatternLock
Demo Apk：https://github.com/DreaminginCodeZH/PatternLock/raw/master/dist/sample.apk
Renderings：
RangeBar
Android widget for selecting a range of values. It provides for the selection of a range of values rather than a single value.
Project Address: https://github.com/edmodo/range-bar
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/range-bar-demo.apk?raw=true
Renderings:
SuperToasts
The SuperToasts library enhances and builds upon the Android Toast class. Some of the features of this library include context sensitive toasts (SuperActivityToasts), toasts with buttons and icons, non context sensitive toasts (SuperToasts), and a new style of toasts (SuperCardToasts) with many customization options for each.
Project Address: https://github.com/JohnPersano/SuperToasts
Demo Apk: https://play.google.com/store/apps/details?id=com.supertoastsdemo
Renderings:
GoogleDateTimePickers
New Google Date and time pickers
Project Address: https://github.com/Mirkoddd/GoogleDateTimePickers
Document: https://play.google.com/store/apps/details?id=com.mirko.sample&hl=it
UndoBar
An implementation of Android's Undo Bar as seen in Google's Gmail app.
Project Address: https://github.com/jenzz/Android-UndoBar
Renderings:
ColorPickerPreference
ColorPickerPreference for android to create color picker in preferences.
Project Address: https://github.com/attenzione/android-ColorPickerPreference
Renderings:
HoloGraphLibrary
This is a library written to allow beautiful graphs and charts to be easily incorporated into your Android application.
Project Address: https://bitbucket.org/danielnadeau/holographlibrary/src
Document: https://bitbucket.org/danielnadeau/holographlibrary/wiki/Home
ChromeView
Android WebView implementation that uses the latest Chromium code
Project Address: https://github.com/pwnall/chromeview
Discrollview
DiscrollView support Item fading in or out, translate or scale
Project Address: https://github.com/flavienlaurent/discrollview
Demo Apk: https://github.com/flavienlaurent/discrollview/raw/master/sample.apk
Android Slider Preference Library
Android library that allows applications to add dialog-based slider widgets to their settings
Project Address: https://github.com/jayschwa/AndroidSliderPreference
ShowcaseView library
Highlight the best bits of your app to users quickly
Project Address: https://github.com/amlcurran/ShowcaseView
android-segmented-control
ios7 UISegmentedControl for android
Project Address: https://github.com/hoang8f/android-segmented-control
PullScrollView
Pull and background rebound effect
Project Address: https://github.com/MarkMjw/PullScrollView
Renderings:
a>

2. Common Util Libs

Include Dependency Injection, ImageCache, Network, Database ORM, Android common lib, Compatible low version, Multimedia, Event Bus, Sensor, Security, Plug-in, File, Othersa>

1. Dependency Injection

Speeds up Android development by dependency injection

AndroidAnnotations(Code Diet)
AndroidAnnotations is an Open Source framework that speeds up Android development. It takes care of the plumbing, and lets you concentrate on what's really important.
Project Address: https://github.com/excilys/androidannotations
Document: https://github.com/excilys/androidannotations/wiki
Official Website: http://androidannotations.org/
roboguice
RoboGuice 2 takes the guesswork out of development. Inject your View, Resource, System Service, or any other object, and let RoboGuice 2 take care of the details.
Project Address: https://github.com/roboguice/roboguice
Document: https://github.com/roboguice/roboguice/wiki
butterknife
View "injection" library for Android.
Project Address: https://github.com/JakeWharton/butterknife
Document: http://jakewharton.github.io/butterknife/
Dagger
A fast dependency injector for Android and Java.
Project Address: https://github.com/square/dagger
Document: http://square.github.io/dagger/
a>

2. Image Cache

Android-Universal-Image-Loader
Powerful and flexible library for loading, caching and displaying images on Android.
Project Address: https://github.com/nostra13/Android-Universal-Image-Loader
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/universal-imageloader-demo.apk?raw=true
Document: http://www.intexsoft.com/blog/item/74-universal-image-loader-part-3.html
picasso
A powerful image downloading and caching library for Android
Project Address: https://github.com/square/picasso
Document: http://square.github.io/picasso/
ImageCache
Image Cache, support multi caching algorithms
Project Address: https://github.com/Trinea/AndroidCommon
Demo Apk: https://play.google.com/store/apps/details?id=cn.trinea.android.demo
Document: http://www.trinea.cn/android/android-imagecache/
Cube ImageLoader
Easy to use, high performance, used in some of the Apps in Alibaba Group. Project Address：https://github.com/etao-open-source/cube-sdk
Demo Apk：https://github.com/liaohuqiu/cube-sdk/raw/master/cube-sdk-sample.apk
Document：http://cube-sdk.liaohuqiu.net/
Renderings: a>

3. Network

Retrofit
Type-safe REST client for Android and Java by Square
Project Address: https://github.com/square/retrofit
Document: http://square.github.io/retrofit/
okhttp
An HTTP+SPDY client for Android and Java applications.
Project Address: https://github.com/square/okhttp
Document: http://square.github.io/okhttp/
Asynchronous Http Client for Android
An asynchronous, callback-based Http client for Android built on top of Apache's HttpClient libraries.
Project Address: https://github.com/loopj/android-async-http
Document: http://loopj.com/android-async-http/
android-query
Android-Query (AQuery) is a light-weight library for doing asynchronous tasks and manipulating UI elements in Android.
Project Address: https://code.google.com/p/android-query/
Document: https://code.google.com/p/android-query/#Why_AQuery?
Demo Apk: https://play.google.com/store/apps/details?id=com.androidquery
Async Http Client
Asynchronous Http and WebSocket Client library for Java
Project Address: https://github.com/AsyncHttpClient/async-http-client
Document: http://sonatype.github.io/async-http-client/
Ion
Android Asynchronous Networking and Image Loading
Project Address: https://github.com/koush/ion
Document: https://github.com/koush/ion#more-examples
Http Request
A simple convenience library for using a HttpURLConnection to make requests and access the response.
Project Address: https://github.com/kevinsawicki/http-request
Document: https://github.com/kevinsawicki/http-request#examples
RoboSpice
RoboSpice is a modular android library that makes writing asynchronous network requests easy
Project Address: https://github.com/stephanenicolas/robospice
Demo Apk: https://github.com/stephanenicolas/RoboDemo/downloads
a>

4. Database

greenDAO
GreenDAO is a light & fast ORM solution for Android that maps objects to SQLite databases. Being highly optimized for Android, greenDAO offers great performance and consumes minimal memory.
Project Address: https://github.com/greenrobot/greenDAO
Document: http://greendao-orm.com/documentation/
Official Website: http://greendao-orm.com/
ActiveAndroid
Active record style SQLite persistence for Android
Project Address: https://github.com/pardom/ActiveAndroid
Document: https://github.com/pardom/ActiveAndroid/wiki/_pages
Sprinkles
Sprinkles is a boiler-plate-reduction-library for dealing with databases in android applications
Project Address: https://github.com/emilsjolander/sprinkles
Document: http://emilsjolander.github.io/blog/2013/12/18/android-with-sprinkles/
ormlite-android
ORMLite Android functionality used in conjunction with ormlite-core
Project Address: https://github.com/j256/ormlite-android
Document: http://ormlite.com/sqlite_java_android_orm.shtml
a>

5. Android common lib

Guava
The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.
Project Address: https://code.google.com/p/guava-libraries/
Document: https://code.google.com/p/guava-libraries/wiki/GuavaExplained
Volley
Easy, Fast Networking for Android
Project Address: https://android.googlesource.com/platform/frameworks/volley
Github Address: https://github.com/mcxiaoke/android-volley
Document: http://commondatastorage.googleapis.com/io-2013/presentations/110%20-%20Volley-%20Easy,%20Fast%20Networking%20for%20Android.pdf
AndroidCommon
Android common lib, include ImageCache, HttpCache, DropDownListView, DownloadManager, Utils and so on
Project Address: https://github.com/Trinea/AndroidCommon
Demo Apk: https://play.google.com/store/apps/details?id=cn.trinea.android.demo
Document: http://www.trinea.cn/android/android-common-lib/
shipfaster
Sample project demonstrating usage of Dagger + Otto + Robolectric + Retrofit + Picasso + OkHttp
Project Address: https://github.com/pyricau/shipfaster
CleanAndroidCode
This project is a proof of concept to show how to integrate Dagger, Otto and AndroidAnnotations.
Project Address: https://github.com/pyricau/CleanAndroidCode
a>

6. Android Compatible low version

ActionBarSherlock
Action bar implementation which uses the native action bar on Android 4.0+ and a custom implementation on pre-4.0 through a single API and theme.
Project Address: https://github.com/JakeWharton/ActionBarSherlock
Demo Apk: https://play.google.com/store/apps/details?id=com.actionbarsherlock.sample.demos
Nine Old Androids
Android library for using the Honeycomb animation API on all versions of the platform back to 1.0!
Project Address: https://github.com/JakeWharton/NineOldAndroids
Demo Apk: https://play.google.com/store/apps/details?id=com.jakewharton.nineoldandroids.sample
Document: http://nineoldandroids.com/
HoloEverywhere
Bringing Holo Theme from Android 4.1 to 2.1 and above.
Project Address: https://github.com/Prototik/HoloEverywhere
Demo Apk: https://raw.github.com/Prototik/HoloEverywhere/repo/org/holoeverywhere/demo/2.1.0/demo-2.1.0.apk
Document: http://android-developers.blogspot.com/2012/01/holo-everywhere.html
SherlockNavigationDrawer
Modification of the Android NavigationDrawer sample to use ActionbarSherlock so that we can use the NavigationDrawer on older devices
Project Address: https://github.com/tobykurien/SherlockNavigationDrawer
Notifications4EveryWhere
Bringing Notifications from Android 4.1 to 2.2 and above.
Project Address: https://github.com/youxiachai/Notifications4EveryWhere
NavigationDrawerDocument: http://developer.android.com/training/implementing-navigation/nav-drawer.html
Android Switch Widget Backport
A backport of the Switch widget that was introduced on Android 4.X to Android2.1++
Project Address: https://github.com/BoD/android-switch-backport
Demo Apk: https://play.google.com/store/apps/details?id=org.jraf.android.backport.switchwidget.sample
Document: https://github.com/BoD/android-switch-backport#using-the-switch
android-datepicker
Android 4.0 DatePicker backported to 2.2
Project Address: https://github.com/SimonVT/android-datepicker
a>

7. Multimedia

cocos2d-x
cocos2d-x is a multi-platform framework for building 2d games, interactive books, demos and other graphical applications. It is based on cocos2d-iphone, but instead of using Objective-C, it uses C++. It works on iOS, Android, Windows Phone, OS X, Windows and Linux.
Project Address: https://github.com/cocos2d/cocos2d-x
Document: http://www.cocos2d-x.org/wiki
Official Website: http://www.cocos2d-x.org/
Vitamio
Vitamio is an open multimedia framework for Android and iOS, with full and real hardware accelerated decoder and renderer.
Project Address: https://github.com/yixia/VitamioBundle
Document: http://www.vitamio.org/docs/
PhotoProcessing
A demo of how you can process photos leveraging the ndk, support Instafix, Ansel, Testino, XPro, Retro, BW, Sepia, Cyano, Georgia, Sahara, HDR, Rotate, Flip and so on
Project Address: https://github.com/lightbox/PhotoProcessing
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/photo-processing.apk?raw=true
Android StackBlur
Android StackBlur is a library that can perform a blurry effect on a Bitmap based on a gradient or radius, and return the result.
Project Address: https://github.com/kikoso/android-stackblur
Demo Apk: https://github.com/kikoso/android-stackblur/blob/master/StackBlurDemo/bin/StackBlurDemo.apk?raw=true
Document: https://github.com/kikoso/android-stackblur#usage
Bitmap Smart Clipping using OpenCV
Bitmap Smart Clipping using OpenCV
Project Address: https://github.com/beartung/tclip-android
Cropper
Android widget for cropping and rotating an image.
Project Address: https://github.com/edmodo/cropper
Document: https://github.com/edmodo/cropper/wiki
Renderings:
android-crop
Android library project for cropping images
Project Address: https://github.com/jdamcd/android-crop
Renderings:
TileView
The TileView widget is a subclass of ViewGroup that provides a mechanism to asynchronously display tile-based images, with additional functionality for 2D dragging, flinging, pinch or double-tap to zoom, adding overlaying Views (markers), built-in Hot Spot support, dynamic path drawing, multiple levels of detail, and support for any relative positioning or coordinate system.
Project Address: https://github.com/moagrius/TileView
Demo Apk: http://moagrius.github.io/TileView/TileViewDemo.apk
BlurEffectForAndroidDesign
Sample to show how to implement blur graphical tricks
Project Address: https://github.com/PomepuyN/BlurEffectForAndroidDesign
android-eye
Change your android phone to surveillance camera
Project Address: https://github.com/Teaonly/android-eye
Demo Apk: https://play.google.com/store/apps/details?id=teaonly.droideye
libpng for Android
libpng for Android NDK
Project Address: https://github.com/julienr/libpng-android
Document: http://www.libpng.org/pub/png/libpng.html
a>

8. Event Bus

A typical use case for Android apps is gluing Activities, Fragments, and background threads together. Conventional wiring of those elements often introduces complex and error-prone dependencies and life cycle issues.

EventBus
Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.
Project Address: https://github.com/greenrobot/EventBus
Document: https://github.com/greenrobot/EventBus#general-usage-and-api
Otto
An enhanced Guava-based event bus with emphasis on Android support.
Project Address: https://github.com/square/otto
Document: http://square.github.io/otto/
Demo Apk: https://play.google.com/store/apps/details?id=de.greenrobot.eventperf
a>

9. Sensor

Great Android Sensing Toolkit
GAST is a toolkit for using Android's Sensing capabilities. It contains the examples, boiler plate code, and algorithms you need to properly use Android sensors.
Project Address: https://github.com/gast-lib/gast-lib
Demo Apk: https://play.google.com/store/apps/details?id=root.gast.playground
Document: https://github.com/gast-lib/gast-lib#documentation
SensorManager
Android Sensor Manager Library
Project Address: https://github.com/nlathia/SensorManager
Document: https://docs.google.com/document/d/1TqThJULb-4e6TGb1gdkAaPCfyuXStjJpbnt7a0OZ9OE/edit
GPSLogger
GPSLogger is an Android app that logs GPS information to GPX, KML or text files and has options for annotating and sharing.
Project Address: https://github.com/mendhak/gpslogger
Demo Apk: https://play.google.com/store/apps/details?id=com.mendhak.gpslogger
Document: http://code.mendhak.com/gpslogger/
Pedometer
Lightweight pedometer app for Android using the hardware step sensor
Project Address: https://github.com/j4velin/Pedometer
leapcast
ChromeCast emulation app for any device
Project Address: https://github.com/dz0ny/leapcast
Arduino-Communicator
Very simple Android application for communicating with Arduino
Project Address: https://github.com/jeppsson/Arduino-Communicator
android-pedometer
App for Android phones that counts your steps.
Project Address: https://github.com/bagilevi/android-pedometer
Demo Apk: http://pedometer.googlecode.com/files/Pedometer-1.4.apk
OwnTracks for Android
OwnTracks Android App
Project Address: https://github.com/owntracks/android
Shake Detector library for Android
This library provides a easy way to detect a shake movement using the build-in accelerometer and fire a callback on the UI thread every times it happens.
Project Address: https://github.com/tbouron/ShakeDetector
Demo Apk: https://play.google.com/store/apps/details?id=com.github.tbouron.shakedetector.example
Android heart rate monitor
Android heart rate monitor
Project Address: https://github.com/phishman3579/android-heart-rate-monitor
Bluetooth LE Library for Android
This library allows for easy access to a Bluetooth LE device's AdRecord and RSSI value. It offers additional functionality for iBeacons.
Project Address: https://github.com/alt236/Bluetooth-LE-Library---Android
Demo Apk: https://play.google.com/store/apps/details?id=uk.co.alt236.btlescan
a>

10. Security

SQLCipher
SQLCipher is an SQLite extension that provides 256 bit AES encryption of database files.
Project Address: https://github.com/sqlcipher/sqlcipher
Document: http://sqlcipher.net/sqlcipher-for-android/
Conceal
Conceal provides easy Android APIs for performing fast encryption and authentication of data, such as that stored on SD cards
Project Address: https://github.com/facebook/conceal
Document: https://github.com/facebook/conceal#usage
Android-PasscodeLock
Android Library that provides passcode lock to your app
Project Address: https://github.com/wordpress-mobile/Android-PasscodeLock
Demo Apk: https://play.google.com/store/apps/details?id=com.sothree.umano
Similar App: Wordpress Android, Alipay
GlowPadBackport
A backport of the Android 4.2 GlowPadView that works on the SDK on API levels 4+
Project Address: https://github.com/rock3r/GlowPadBackport
Demo Apk: https://play.google.com/store/apps/details?id=net.sebastianopoggi.samples.ui.GlowPadSample
Renderings:
GlowPadView
GlowPadView for Android is a great library to implement Google's lockscreen and new alarmclock style. (Taken from Android's Source Code)
Project Address: https://github.com/nadavfima/GlowPadView
Renderings: https://raw.github.com/nadavfima/GlowPadView/master/example.png
android-lockpattern
lockpattern activity for Android
Project Address: https://code.google.com/p/android-lockpattern/
Demo Apk: https://play.google.com/store/apps/details?id=group.pals.android.lib.ui.lockpattern.demo
Document: https://code.google.com/p/android-lockpattern/wiki/QuickUse
a>

11. Others

Salvage view
Generic view recycler and ViewPager PagerAdapter implementation.
Project Address: https://github.com/JakeWharton/salvage
Android Priority Job Queue
A Job Queue specifically written for Android to easily schedule jobs (tasks) that run in the background, improving UX and application stability.
Project Address: https://github.com/path/android-priority-jobqueue
Document: https://github.com/path/android-priority-jobqueue#getting-started
jsoup
Java HTML Parser, with best of DOM, CSS, and jquery
Project Address: https://github.com/jhy/jsoup
Official Website: http://jsoup.org/
ZIP
ZeroTurnaround ZIP Library
Project Address: https://github.com/zeroturnaround/zt-zip
Document: https://github.com/zeroturnaround/zt-zip#examples
Cobub Razor
Cobub Razor - Open Source Mobile Analytics Solution, include web, android，ios, window phone
Project Address: https://github.com/cobub/razor
Demo Apk: http://demo.cobub.com/razor
Document: http://dev.cobub.com/
aFileChooser
Android library that provides a file explorer to let users select files on external storage.
Project Address: https://github.com/iPaulPro/aFileChooser
androidpn
An open source project to provide push notification support for Android -- a xmpp based notification server and a client tool kit.
Project Address: https://github.com/dannytiehui/androidpn
purePDF
A complete actionscript PDF library
Project Address: https://github.com/sephiroth74/purePDF
Bolts
Bolts is a collection of low-level libraries designed to make developing mobile apps easier.
Project Address: https://github.com/BoltsFramework/Bolts-Android/
CastCompanionLibrary-android
CastCompanionLibrary-android is a library project to enable developers integrate Cast capabilities into their applications faster and easier.
Project Address: https://github.com/googlecast/CastCompanionLibrary-android
Document: https://developers.google.com/cast/
CastVideos-android
CastVideos-android application shows how to cast videos from an android device in a way that is fully compliant with the Design Checklist.
Project Address: https://github.com/googlecast/CastVideos-android
Document: https://developers.google.com/cast/
Uninstall_Statics
Android Statistical application is uninstalled
Project Address: https://github.com/sevenler/Uninstall_Statics
Document: http://www.cnblogs.com/zealotrouge/p/3157126.html
xCombine
Android Plugin Framework
Project Address: https://github.com/wyouflf/xCombine
Document: http://my.oschina.net/u/1171837/blog/155377
Memento
Memento is an annotation processor for Android that gives your activities a memory. It introduces the @Retain annotation, which allows you to retain arbitrary fields of an activity across configuration changes in a simple and type-safe manner.
Project Address: https://github.com/mttkay/memento
Document: https://github.com/mttkay/memento#usage
svg-android
SVG parsing and rendering for Android
Project Address: https://code.google.com/p/svg-android/
Office 365 SDK for Android Preview
Office 365 SDK for Android Preview by Microsoft Open Technologies, Inc. support Microsoft SharePoint Lists, Microsoft SharePoint Files, Microsoft Exchange Calendar, Microsoft Exchange Contacts, Microsoft Exchange Mail
Project Address: https://github.com/OfficeDev/Office-365-SDK-for-Android
OpenSpritz-Android
OpenSpritz concept for Android, is a Spritz-like .epub and website reader for Android 3.0+
Project Address: https://github.com/OnlyInAmerica/OpenSpritz-Android
FreeFlow
A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition animations as data and layouts change
Project Address: https://github.com/Comcast/FreeFlow
Demo Apk: https://github.com/Comcast/FreeFlow/releases
Android Gesture Detectors Framework
Gesture detector framework for multitouch handling on Android
Project Address: https://github.com/Almeros/android-gesture-detectors
a>

3. Excellent projects

Linux
Project Address: https://github.com/torvalds/linux
Android
Project Address: https://android.googlesource.com/

(1) ZXing
ZXing ("zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages.
Project Address: https://github.com/zxing/zxing
Demo Apk: https://play.google.com/store/apps/details?id=com.google.zxing.client.android

(2) photup
With photup you can share your photos to your Facebook profile, quicker than ever before.
Project Address: https://github.com/chrisbanes/photup
Demo Apk: https://play.google.com/store/apps/details?id=uk.co.senab.photup

(3) github-android GitHub Android App
Project Address: https://github.com/github/android
Demo Apk: https://play.google.com/store/apps/details?id=com.github.mobile

(4) Notes
MIUI Notes Project Address: https://github.com/MiCode/Notes
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/miui-note-demo.apk?raw=true

(5) weicuiyuan
Sina Weibo Android Client
Project Address: https://github.com/qii/weiciyuan
Demo Apk: https://play.google.com/store/apps/details?id=org.qii.weiciyuan

(6) gnucash-android
Gnucash for Android mobile companion application.
Project Address: https://github.com/codinguser/gnucash-android
Demo Apk: http://play.google.com/store/apps/details?id=org.gnucash.android

(7) AntennaPod
A podcast manager for Android
Project Address: https://github.com/danieloeh/AntennaPod
Demo Apk: https://play.google.com/store/apps/details?id=de.danoeh.antennapod

(8) ChaseWhisplyProject
An augmented reality attempt
Project Address: https://github.com/tvbarthel/ChaseWhisplyProject
Demo Apk: https://play.google.com/store/apps/details?id=fr.tvbarthel.games.chasewhisply

(9) Tweet Lanes
Tweet Lanes for Android
Project Address: https://github.com/chrislacy/TweetLanes
Demo Apk: https://play.google.com/store/apps/details?id=com.tweetlanes.android

(10) Financius
Android Expense Manager
Project Address: https://github.com/mvarnagiris/Financius
Demo Apk: https://play.google.com/store/apps/details?id=com.code44.finance

(11) todo.txt-android
Official Todo.txt Android app for managing your todo.txt file stored in Dropbox.
Project Address: https://github.com/ginatrapani/todo.txt-android
Demo Apk: https://play.google.com/store/apps/details?id=com.todotxt.todotxttouch

(13) Muzei Live Wallpaper
Muzei Live Wallpaper for Android
Project Address: https://github.com/romannurik/muzei
Demo Apk: https://play.google.com/store/apps/details?id=net.nurik.roman.muzei
a>

4: Development and testing tools

Android open source projects about development tools and testing tools. a>

1. Development productivity tools

Json2Java
Automate processing Java classes to mirror json models.
Project Address: https://github.com/jonfhancock/JsonToJava
Online Demo: http://jsontojava.appspot.com/
IntelliJ Plugin for Android Parcelable boilerplate code generation
IntelliJ Plugin for Android Parcelable boilerplate code generation.
Project Address: https://github.com/mcharmas/android-parcelable-intellij-plugin
Renderings:
Android Holo Colors IntelliJ Plugin
IntelliJ / Android Studio plugin for Android Holo Colors
Project Address: https://github.com/jeromevdl/android-holo-colors-idea-plugin
Renderings:
Android Drawable Factory
A Java Application to create appropriate Drawable resources for your Android application
Project Address: https://github.com/tizionario/AndroidDrawableFactory
Renderings:
SelectorChapek for Android
Android Studio plugin which automatically generates drawable selectors from appropriately named resources.
Project Address: https://github.com/inmite/android-selector-chapek
Android Action Bar Style Generator
Easily create a simple, attractive and seamless custom action bar style for your Android application
Project Address: https://github.com/jgilfelt/android-actionbarstylegenerator
Online Demo: http://jgilfelt.github.io/android-actionbarstylegenerator/
ButterKnifeZelezny
Android Studio plug-in for generating ButterKnife injections from selected layout XML.
Project Address: https://github.com/inmite/android-butterknife-zelezny
RoboCoP
Pure Java code generation tool for generating a fully functional ContentProvider for Android.
Project Address: https://github.com/mediarain/RoboCoP
appiconsizes
IOS and Android App Icon size generator
Project Address: http://www.appiconsizes.com/
Gradle Retrolambda Plugin
This plugin will automatically build your java or android project with Retrolambda, giving you lambda goodness on java 6 or 7. It relies on the wonderful retrolambda by Esko Luontola.
Project Address: https://github.com/evant/gradle-retrolambda
jsonschema2pojo
Generates Java types from JSON Schema (or example JSON) and annotates those types for data-binding with Jackson 1.x or 2.x, Gson.
Project Address: https://github.com/joelittlejohn/jsonschema2pojo
Online Demo: http://www.jsonschema2pojo.org/

2. Develop self-test related

Quality Tools for Android
This is an Android sample app + tests that will be used to work on various project to increase the quality of the Android platform.
Project Address: https://github.com/stephanenicolas/Quality-Tools-for-Android
android-test-kit
Google's Testing Tools For Android
Project Address: https://code.google.com/p/android-test-kit/
Document: https://code.google.com/p/android-test-kit/w/list
robolectric
Robolectric is a unit test framework that de-fangs the Android SDK so you can test-drive the development of your Android app.
Project Address: https://github.com/robolectric/robolectric
Demo Apk: https://github.com/robolectric/robolectricsample
Document: http://robolectric.org/
Android FEST
A set of FEST assertion helpers geared toward testing Android.
Project Address: https://github.com/square/fest-android
BoundBox
BoundBox provides an easy way to test an object by accessing all its fields, constructor and methods, public or not. BoundBox breaks encapsulation.
Project Address: https://github.com/stephanenicolas/boundbox
Hugo
Annotation-triggered method call logging for your debug builds.
Project Address: https://github.com/JakeWharton/hugo
scalpel
A surgical debugging tool to uncover the layers under your app.
Project Address: https://github.com/JakeWharton/scalpel
Android Screenshot library
On-demand screenshots for your Android integration tests
Project Address: https://github.com/rtyley/android-screenshot-lib
sonar-android-lint-plugin
Extension plugin for Android Lint in Sonar
Project Address: https://github.com/SonarCommunity/sonar-android
Document: http://docs.codehaus.org/display/SONAR/Android+Plugin
a>

3. Testing tools

Spoon
Distributing instrumentation tests to all your Androids.
Project Address: https://github.com/square/spoon
a>

4. Development and build environment

Buck
Buck is an Android build tool, is more powerful than ant.
Project Address: https://github.com/facebook/buck
Android Maven Plugin
A plugin for Android application development with Apache Maven 3.1.1+ and the Android SDK.
Project Address: https://github.com/jayway/maven-android-plugin
umeng-muti-channel-build-tool
Umeng packaing tools
Project Address: https://github.com/umeng/umeng-muti-channel-build-tool
Genymotion
THE FASTER ANDROID EMULATOR
Project Address: http://www.genymotion.com/
gradle-mvn-push
Helper to upload Gradle Android Artifacts to Maven repositories
Project Address: https://github.com/chrisbanes/gradle-mvn-push
Document: https://github.com/chrisbanes/gradle-mvn-push#usage
Android Emulator Plugin for Jenkins
Android Emulator plugin for Jenkins
Project Address: https://github.com/jenkinsci/android-emulator-plugin
Android Maven Plugin
A tool to install components of the Android SDK to use with the Maven Android Plugin.
Project Address: https://github.com/mosabua/maven-android-sdk-deployer
SDK Manager Plugin
Gradle plugin which downloads and manages your Android SDK.
Project Address: https://github.com/JakeWharton/sdk-manager-plugin
a>

5. Others

ViewServer
Local server for Android's HierarchyViewer
Project Address: https://github.com/romainguy/ViewServer
GridWichterle for Android
This app will show grid overlay over whole system which helps you to verify your excellent app design.
Project Address: https://github.com/inmite/android-grid-wichterle
Demo Apk: https://play.google.com/store/apps/details?id=eu.inmite.android.gridwichterle
Catlog
Logcat-reading app for Android
Project Address: https://github.com/nolanlawson/Catlog
Online Demo: https://play.google.com/store/apps/details?id=com.nolanlawson.logcat
PID Cat
Colored logcat script which only shows log entries for a specific application package.
Project Address: https://github.com/JakeWharton/pidcat
ACRA
ACRA is a library enabling Android Application to automatically post their crash reports to a GoogleDoc form. It is targetted to android applications developers to help them get data from their applications when they crash or behave erroneously.
Project Address: https://github.com/ACRA/acra
Document: https://github.com/ACRA/acra/wiki/BasicSetup
Android Resource Navigator
Chrome Extension providing enhanced resource navigation for GitHub hosted Android projects
Project Address: https://github.com/jgilfelt/android-resource-navigator
Online Demo: https://chrome.google.com/webstore/detail/android-resource-navigato/agoomkionjjbejegcejiefodgbckeebo?hl=en&gl=GB
a>

4. Outstanding individuals and groups

1. Individual

JakeWharton
Github Address: https://github.com/JakeWharton
Masterpiece: ActionBarSherlock，Android-ViewPagerIndicator，Nine Old Androids，SwipeToDismissNOA，hugo，butterknife，Android-DirectionalViewPager, scalpel
HomePage: http://jakewharton.com/
Chris Banes
Github Address: https://github.com/chrisbanes
Masterpiece: ActionBar-PullToRefresh，PhotoView，Android-BitmapCache，Android-PullToRefresh
HomePage: http://chris.banes.me/
Koushik Dutta
Github Address: https://github.com/koush
Masterpiece: Superuser，AndroidAsync，UrlImageViewHelper，ion
HomePage: http://koush.com/
Simon Vig
Github Address: https://github.com/SimonVT
Masterpiece: android-menudrawer，MessageBar
HomePage: http://simonvt.net/
Manuel Peinado
Github Address: https://github.com/ManuelPeinado
Masterpiece: FadingActionBar，GlassActionBar，RefreshActionItem，QuickReturnHeader
Emil Sj?lander
Github Address: https://github.com/emilsjolander
Masterpiece: StickyListHeaders，sprinkles，android-FlipView
HomePage: http://emilsjolander.se/
greenrobot
Github Address: https://github.com/greenrobot
Masterpiece: greenDAO，EventBus
HomePage: http://greenrobot.de/
Jeff Gilfelt
Github Address: https://github.com/jgilfelt
Masterpiece: android-mapviewballoons，android-viewbadger，android-actionbarstylegenerator，android-sqlite-asset-helper
HomePage: http://jeffgilfelt.com
Romain Guy
Github Address: https://github.com/romainguy
Masterpiece: ViewServer
HomePage: http://www.curious-creature.org/category/android/
Other：http://www.flickr.com/photos/romainguy
sephiroth74
Github Address: https://github.com/sephiroth74
Masterpiece: ImageViewZoom，HorizontalVariableListView，AndroidWheel，purePDF
HomePage: http://www.sephiroth.it/
Cyril Mottier
Github Address: https://github.com/cyrilmottier
Masterpiece: GreenDroid，Polaris
HomePage: http://cyrilmottier.com/
a>

2. Group

Square
Github Address: https://github.com/square
Masterpiece: okhttp, fest-android，android-times-square, picasso, dagger, spoon and so on HomePage: http://square.github.io/
Inmite s.r.o.
Github Address: https://github.com/inmite
Masterpiece: android-styled-dialogs，android-grid-wichterle，android-selector-chapek
HomePage: http://www.inmite.eu/
a>

News:

Android Weekly - a free newsletter that helps you remain on the cutting-edge with your Android Development.

Tutorials:

Google's Android Developer Training

CommonsWare - AdvAndroid

Vogella

DZone Javalobby

Java Code Geeks

Architecture:

Ignition - Helps you get your Android applications off the ground quickly by offering ready-to-use components and utility classes

GreenDroid - Makes UI development easier and consistent throughout your applications

Spring For Android - An extension of the Spring Framework that aims to simplify the development of native Android applications

DroidParts - a framework that includes DI, ORM, logging, a REST Client and more

ORM:

OrmLite - Provides some lightweight functionality for persisting Java objects to SQL databases

Active Record for Android - Lightweight persistence library for Android

GreenDao - Open source project to help Android developers working with data stored in SQLite

Design:

Android Patterns - Interaction patterns that can help you design Android apps.

Google Android Design Guide - Official android design guide by Google.

Android App Patterns - 1225 app screenshots in 29 categories all in one.

Android 4.0 Design Startkit - Some starter kits with Photoshop PSD's.

Android Niceties - A collection of screenshots encompassing some of the most beautiful looking Android apps.

Android Holo Colors Generator - Allows you to easily create Android components with your own color scheme

ICS Apps - IceCream sandwich app screenshots

Dependency Injection:

RoboGuice - Smoothes out some of the wrinkles in your Android development and slims down your application code

Android Annotations - Takes care of the plumbing and lets you concentrate on what's really important. By simplifying your code, it facilitates its maintenance.

Networking:

Loopj - An asynchronous, callback-based HTTP client for Android

Volley - It manages the processing and caching of network requests and it saves developers valuable time from writing the same network call/cache code again and again

UI:

ActionBarSherlock - Designed to facilitate the use of the action bar design pattern across all versions of Android with a single API

NineOldAndroids - Library for using the Honeycomb (Android 3.0) animation API on all versions of the platform back to 1.0

Pull To Refresh - Provides a reusable pull-to-refresh widget for Android.

Android Validator - Form validator library

Progress Wheel - A custom component for Android that replaces the progress bar

Scroll Bar Panel - Attaches a view to a scroll indicator

View Page Indicator - Provides widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock.

View Badger - A simple way to "badge" any given Android view at runtime

Universal Image Loader - Powerful and flexible instrument for asynchronous loading, caching and displaying images

ColorPicker - To create a color picker in preferences

Segmented Radio Button - Implementation of iOS's segmented control

PhotoView - Implementation of ImageView, which supports zooming by various touch gestures

Smart Image View - ImageView replacement that allows image loading from URLs or the contact address book with caching.

Android Lock Pattern - Users can define their own lock pattern ‒ which is a combination of 4+ dots

Testing:

Android Mock - A framework for mocking interfaces and classes on the Dalvik VM

Robotium - A test automation framework that has full support for native and hybrid applications

Tools:

Application Crash Report - ACRA - A library enabling Android Applications to automatically post their crash reports in a GoogleDoc form

Android Studio - A new Android development environment based on IntelliJ IDEA

Hungry for more?

App Dev Wiki

Android Views

Open Intents Android Libraries

Basic4Android Wiki

Vogella Useful Android Libs

    IO
    Network
    Event Bus
    Tasks
    Open GL
    Dependency Injection
    Testing
    Reverse Engineering
    Bluetooth
    Scan
    File Pickers

EXAMPLES

    Network
    Tasks
    Dependency Injection

TOOLS

    Proguard
    Testing
    Log
    Localization

OPEN SOURCE APPS

    Camera
    P2P
    Chat
    Pedometer
    NFC
    Media
    Other

Libraries

UI

Widgets

TextView

Title	Description
AutoFit TextView	A TextView that automatically resizes text to fit perfectly within its bounds
Token AutoComplete	Gmail style MultiAutoCompleteTextView for Android
Android RobotoTextView	Implementation of a TextView and all its direct/indirect subclasses with native support for the Roboto fonts, includes the brand new Roboto Slab fonts
Android Ago	An Android TextView that always displays an auto refreshing relative time span with respect to a reference time
Timely TextView	Animated TextView like Timely app
Email AutoComplete TextView	An AutoCompleteTextView optimized for email auto-complete
Shimmer Android	An Android TextView with a shimmering effect
Titanic	Android experiment showing a sinking TextView
Blink TextView	Remember the '90s? Geocities? Blinking text? Dat. On Android
Secret TextView	A TextView that simulates the effect from the app Secret where the characters fade in/out at different speeds

Button

Title	Description
Android Process Button	Custom android button which can indicate progress

EditText

Title	Description
Float Label EditText	Floating hint from edit text
EditText Mentions	EditText subclass with mentions detection (like Facebook or Twitter)
History EditText	Android EditText that auto-saves previous values and displays them in a dropdown when used again
Single Input Form	A single EditText instead of a classical form

ImageView

Title	Description
Ken Burns View	Android ImageViews animated by Ken Burns Effect
PhotoView	Implementation of ImageView for Android that supports zooming, by various touch gestures
Circle ImageView	A circular ImageView for Android
Custom Shape ImageView	Custom shape ImageView using PorterDuffXfermode with paint shapes and SVGs
Rounded ImageView	a fast ImageView that supports rounded corners and ovals or circles
Flip ImageView	Small android lib allowing you to make a flip imageview easily, by extending FlipImageView
Glide	An image loading and caching library for Android focused on smooth scrolling
Circular ImageView	Custom view for circular images in Android while maintaining the best draw performance

ProgressBar

Title	Description
Android Holo Circular ProgressBar	is a Custom View implementation for Android you might know from the Android Clock
Google ProgressBar	Android library to display progress like google does in some of his services
Smooth ProgressBar	A small Android library allowing you to have a smooth and customizable horizontal indeterminate ProgressBar
Progress Wheel	A progress wheel for android, intended for use instead of the standard progress bar
Number ProgressBar	A more beautiful, slim, sexy Android progressbar
Android Process Button *	Custom android button which can indicate progress

ListView

Title	Description
Flabby ListView	Android library to display a ListView which cells are not rigid but flabby and react to ListView scroll and touch events
Dob List	DobLis is an Open Source Android library that provides to ListView adding ProgressBar (or any view) to the footer of ListView to be shown in loading more, and callback that is called when reaching last item in ListView
Android Swipe ListView	An Android List View implementation with support for drawable cells and many other swipe related features
Multi Choice Adapter	A ListView adapter with support for multiple choice modal selection
Jazzy ListView	JazzyListView is an extension of ListView designed to animate list item views as they become visible
ListView Animations	An Android library which allows developers to easily add animations to ListView items
Slide Expandable ListView	A better ExpandableListView, with animated expandable views for each list item
Swipe ListView	An Android List View implementation with support for drawable cells and many other swipe related features
Super ListView	Way more than just a listview

ViewPager

Title	Description
Jazzy ViewPager	An easy to use ViewPager that adds an awesome set of custom swiping animations. Just change your ViewPagers to JazzyViewPagers, two more steps, and you're good to go!
Android ViewPager Indicator	Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock
Salvage	Generic view recycler and ViewPager PagerAdapter implementation
Android Auto Scroll ViewPager	auto scroll ViewPager or ViewPager in ViewPager. http://www.trinea.cn/
Pager Sliding Tab Strip	An interactive indicator to navigate between the different pages of a ViewPager
Numeric Page Indicator	A ViewPager page indicator that displays the current page number and (optionally) the page count
Wizard Pager	Wizard Pager is a library that provides an example implementation of a Wizard UI on Android, it's based of Roman Nurik's wizard pager (https://code.google.com/p/romannurik-code/source/browse/misc/wizardpager)
ViewPager Transformations	Library containing common animations needed for transforming ViewPager scrolling for Android v13+

SeekBar

Title	Description
Start Point SeekBar	StartPointSeekBar is a custom view for the Android platform that makes it possible to have a SeekBar to have custom start point

GridView

Title	Description
Asymmetric GridView	Crazy-ass Android GridView with asymmetric items
Sticky Grid Headers	An Android Library that makes it easy to make grid views with sectioned data and headers that stick to the top. http://tonicartos.github.io/StickyGridHeaders/

ScrollView

Title	Description
Discroll View	Scroll + discover = DiscrollView

ActionBar

Title	Description
Not Boring ActionBar	News Stand app makes the ActionBar not boring!
Glass ActionBar	A library that adds a glass-like effect to the action bar
Fading ActionBar	Android library implementing a fading effect for the action bar, similar to the one found in the Play Music app
ActionBar PullToRefresh	A modern implementation of the pull-to-refresh interaction for #android
Refresh Action Item	An action bar item which acts both as a refresh button and as a progress indicator

Sliding Views

Title	Description
Android Sliding Up Panel	This type of a panel is a common pattern also used in the Google Music app and the Rdio app
DobSliding	DobSliding is an Open Source Android library that allows developers to develop applications with vertical sliding menus just like the Android notifications menu
Android Menu Drawer	A slide-out menu implementation, which allows users to navigate between views in your app. http://simonvt.github.com/android-menudrawer/
Sliding Menu	An Android library that allows you to easily create applications with slide-in menus
Side Navigation	Implementation of "SIde Navigation" or "Fly-in app menu" pattern for Android (based on Google+ app). http://johnkil.github.com/SideNavigation

Other

Title	Description
Android FlipView	A small, easy to use android library for implementing flipping between views as seen in the popular Flipboard application
Android Flip	A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
Android PDF View	A fast PDF reader component for Android development
Android ViewBadger	A simple way to "badge" any given Android view at runtime without having to cater for it in layout
Quilt View Library	QuiltView displays views of different sizes in a scrollable grid
FreeFlow	A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition animations as data and layouts change
Draggable Panel	Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component
Android Reside Menu	The idea of ResideMenu is from Dribbble 1 and 2. It has come true and run in iOS devices. iOS ResideMenu This project is the RefsideMenu Android version. The visual effect is partly referred to iOS version of ResideMenu
ShowCase View	Highlight the best bits of your app to users quickly, simply, and cool. http://amlcurran.github.io/ShowcaseView/
Foldable Layout	Android widgets to implement folding animation
Image Layout	Android - A layout that arranges its children in relation to a background image
Swipeable cards	A native library providing a Tinder-like cards effect. A card can be constructed using an image and displayed with animation effects, dismiss-to-like and dismiss-to-unlike, and use different sorting mechanisms

Dialogs & Pickers

Title	Description
Update Checker	Increase your app's updates
Android Style Dialogs	A simple library for styling Android dialogs in the Holo theme. It also removes boilerplate code for displaying simple dialogs
DateTime Picker	DateTimePicker is a library which contains the beautiful DatePicker that can be seen in the new Google Agenda app
Recurrence Picker	Google Calendar Recurrence picker

Toasts

Title	Description
Android AppMsg	In-layout notifications. Based on Toast notifications and article by Cyril Mottier (http://android.cyrilmottier.com/?p=773)
Super Toasts	A library that extends the Android toast framework
Message Bar	An Android Toast replacement, similar to the one seen in the GMail app. http://simonvt.github.com/MessageBar/
Undo Bar	The UI component for Android advanced UI pattern undo-bar, used in Gmail app, create by Roman Nurik. http://soarcn.github.io/UndoBar

Animation

Parallax

Title	Description
Motion	An Android library allowing images to exhibit a parallax effect
Parallax Pager	Add some depth to your Android scrolling

Other

Title	Description
Android Sliding Up Panel *	Android Sliding Up Panel Demo
Android FlipView *	A small, easy to use android library for implementing flipping between views as seen in the popular Flipboard application
Android Flip *	A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
Flabby ListView *	Android library to display a ListView which cells are not rigid but flabby and react to ListView scroll and touch events
FreeFlow *	A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition animations as data and layouts change
Ken Burns View *	Android ImageViews animated by Ken Burns Effect
Draggable Panel *	Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component
DobSliding *	DobSliding is an Open Source Android library that allows developers to develop applications with vertical sliding menus just like the Android notifications menu
Jazzy ListView *	JazzyListView is an extension of ListView designed to animate list item views as they become visible
ListView Animations *	An Android library which allows developers to easily add animations to ListView items
Slide Expandable ListView *	A better ExpandableListView, with animated expandable views for each list item
Sticky List Headers	An android library for section headers that stick to the top
Android ScrollBar Panel	Android ScrollBarPanel allows to attach a View to a scroll indicator like it's done in Path 2.0
Foldable Layout *	Android widgets to implement folding animation
Animation Easing Functions	Android Animation Easing Functions. Let's make animation more real!
Android View Animations	Cute view animation collection

Maps

Title	Description
Clusterer	Clustering in Maps v2 for Android

Validation

Title	Description
Android Saripaar	UI Validation Library for Android

Camera

Title	Description
Easy Camera	Wrapper around the android Camera class that simplifies its usage

Charts

Title	Description
Eaze Graph	An Android chart and graph library

Other

Title	Description
Shake Detector	This library provides a easy way to detect a shake movement using the build-in accelerometer and fire a callback on the UI thread every times it happens
Android Face Cropper	Android bitmap Face Cropper

Location

Title	Description
Fluffy	Battery-friendly background location updates for Android, using Google Play Location where available
Fused Location	This project aims to bring the Fused location provider to android apps without requiring the Play Services library
Reactive Location	Small library that wraps Google Play Service API in brilliant RxJava Observables reducing boilerplate to minimum

Social

Title	Description
Twitter 4J	Twitter4J is an open-sourced, mavenized and Google App Engine safe Java library for the Twitter API
Twitter Android SDK	Twitter SDK for Android, using Twitter4j
Facebook Android SDK	Use the Facebook SDK for Android to integrate with Facebook, help build engaging social apps
Android Social Networks	Library for easy work with Facebook, Twitter, LinkedIn and Google on Android

DB & Preferences

ContentProvider / ContentResolver / Cursor

Title	Description
Android DB Commons	Some common utilities for ContentProvider/ContentResolver/Cursor and other db-related android stuff
Schematic	Automatically generate ContentProviders
Android Content Provider Generator	A small tool to generate an Android ContentProvider

Preferences

Title	Description
Esperandro	Easy SharedPreference Engine for Android
Secure Preferences	Android SharedPreference wrapper that encrypts keys and values of Shared Preferences. It's not bullet proof security but rather a quick win for incrementally making your android app more secure
AES Secure Preferences	Secure AES Encryiption decorated Android Shared Preferences implementation

Other

Title	Description
Snappy DB	A key-value database for Android
Cupboard	Cupboard for Android is simple persistence that gets out of your way and is easy to add to your existing code base
Android SQLite Asset Helper	An Android helper class to manage database creation and version management using an application's raw asset files
Sprinkles	Sprinkles is a boiler-plate-reduction-library for dealing with databases in android applications
Sugar	Insanely easy way to work with Android Database. http://satyan.github.com/sugar/

IO

Title	Description
Conceal	Conceal provides easy Android APIs for performing fast encryption and authentication of data, such as that stored on SD cards. http://facebook.github.io/conceal/

Network

Title	Description
Merlin	Observes network connection status & gives callbacks
Robospice	RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules
Android Volley	Android Volley Mirror
Retrofit	Type-safe REST client for Android and Java by Square, Inc
OkHttp	An HTTP+SPDY client for Android and Java applications
KSOAP 2 Android	Lightweight and efficient SOAP client library for the Android platform
Android Async Http	An Asynchronous HTTP Library for Android
Android SSL TrustKiller	Bypass SSL certificate pinning for most applications

Event Bus

Title	Description
Otto	An enhanced Guava-based event bus with emphasis on Android support.
http://square.github.io/otto/
EventBus	Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality

Tasks

Title	Description
Robospice *	RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules
Bolts Android	Bolts is a collection of low-level libraries designed to make developing mobile apps easier

Open GL

Title	Description
Android Page Curl	An example application for creating page curl/flip effect on Android using OpenGL ES

Dependency Injection

Title	Description
Butterknife	View "injection" library for Android

Testing

Title	Description
Robotium	Like Selenium, but for Android
Spoon	Distributing instrumentation tests to all your Androids
Fest Android	A set of FEST assertion helpers geared toward testing Android
Double Espresso	A pure Gradle port of the Espresso testing utility for Android

Reverse Engineering

Title	Description
JadX	Dex to Java decompiler

File Pickers

Title	Description
NoNonSense File Picker	A file/directory-picker for android. Implemented as a library project

Bluetooth

Title	Description
Android Bluetooth SPP	Bluetooth Serial Port Profile which comfortable to developer application to communication with microcontroller via bluetooth

Scan

Title	Description
ZXing	Official ZXing ("Zebra Crossing") project home
ZXing Android Minimal	Port of the ZXing Android application as a minimal Android library project, for embedding in other Android applications
ZXing Fragment	Barcode scanner for Android fragments. Compatible with Android 2.1+
Barcode Scanner	Barcode Scanner Libraries for Android

Samples

Network

Title
Robospice Samples

Tasks

Title
Robospice Samples *

Dependency Injection

Title
Android Dagger Example

Tools

Proguard

Title	Description
Facebook Proguard	A faster fork of ProGuard. Based off of ProGuard 4.11 (http://sourceforge.net/p/proguard/code/ci/proguard4.11/tree/)

Testing

Title	Description
Quality Tools for Android	This is an Android sample app + tests that will be used to work on various project to increase the quality of the Android platform

Log

Title	Description
Hugo	Annotation-triggered method call logging for your debug builds
Phone Home	PhoneHome is a standalone library that sends logs from remote Android devices to a central server for debugging. PhoneHome requires nothing of end users
Timber	A logger with a small, extensible API which provides utility on top of Android's normal Log class. http://jakewharton.github.io/timber/
Debug Log	Create a simple and more understandable Android logs

Localization

Title	Description
DexterApps Translation Util	Automatic String Translation Utility for Android and iOS

Open Source Apps

Camera

Title	Description
PhotoUp

P2P

Title	Description
Transdroid	Manage your torrents from your Android device

Chat

Title	Description
Conversations	Conversations is an open source XMPP (formally known as Jabber) client for Android 4.0+ smart phones
Text Secure	A secure text messaging application for Android

Pedometer

Title	Description
Step Counter	A Step Counter for Android KitKat devices with Built-in Pedometers

NFC

Title	Description
Farebot	Read data from public transit cards using your NFC Android phone!

Media

Title	Description
Mizuu	Popular media indexer app for Android. http://mizuu.tv
Exo Player	Google Media Player Open Source project

Other

Title	Description
Financius	Personal expense manager
Gaug.es Android	Gaug.es Android App
White House Android	White House application for Android
Ac Display	AcDisplay is a new way of handling notifications in Android. http://acdisplay.artemchep.com
Google I/O	Google I/O application
Wordpress Android	WordPress for Android. http://android.wordpress.org
One Bus Away	The official Android app for OneBusAway.
http://www.onebusaway.org/

###Table of contents

Framework
EventBus
Orm
[Image Loading](#Image Loading)
Animations
Network
Widget
- Material
- UI
- TextView/EditText
- ImageView
- Button
- [Progressbar/Progress View](#Progressbar/Progress View)
- Menu
- Dialog
- ListView/ScrollView
- GridView
- RatingView
- Recyclerview
- ViewPager
- ActionBar
- Fragment
- Tabs
- Toast
- SeekBar
- [Calendar View](#Calendar View)
- Layout
- Other
Template
Adapter
Validation
Gesture
[Game Engine](#Game Engine)
Bluetooth
SocialNetworks
XMPP
Plugin
[Code Generation](#Code Generation)
Media
Embedded
Utility
SDK
Test
Chart
Icons
Colors
Font
OpenGL
Debug
Demo
App
Security
Tools
Decompiler
[Gradle plugin](#Gradle plugin)
[Android Wear](#Android Wear)
Other

###</ Framework

roboguice Google Guice on Android, version 2.0
https://github.com/roboguice/roboguice
AndroidAnnotations Fast Android Development. Easy maintainance.
https://github.com/excilys/androidannotations
afinal Afinal是一个android的ioc，orm框架
https://github.com/yangfuhai/afinal
xUtils** android orm, bitmap, http, view inject...
https://github.com/wyouflf/xUtils
ThinkAndroid ThinkAndroid是一个免费的开源的、简易的、遵循Apache2开源协议发布的Android开发框架，其开发宗旨是简单、快速的进行 Android应用程序的开发
https://github.com/white-cat/ThinkAndroid
KJFrameForAndroid KJFrameForAndroid 又叫KJLibrary，是一个android的orm 和 ioc 框架。
https://github.com/kymjs/KJFrameForAndroid
dagger A fast dependency injector for Android and Java.
https://github.com/square/dagger
droidparts DI, ORM, JSON, ...
https://github.com/yanchenko/droidparts
butterknife View "injection" library for Android.
https://github.com/JakeWharton/butterknife
android-common Android common lib, include ImageCache, HttpCache, DropDownListView, DownloadManager, Utils and so on
https://github.com/Trinea/android-common
android-priority-jobqueue A Job Queue specifically written for Android to easily schedule jobs (tasks) that run in the background, improving UX and application stability.
https://github.com/path/android-priority-jobqueue
SAF SAF(Simple Android Framework)是一个简单的android框架，它为开发Android app提供了基础性组件。
https://github.com/fengzhizi715/SAF
AndroidBinding MVVM for Android
https://github.com/gueei/AndroidBinding
RoboBinding A data-binding Presentation Model(MVVM) framework for the Android platform.
https://github.com/RoboBinding/RoboBinding
androidkit android开发框架，可以帮助你大量提高android应用开发效率。
https://github.com/msdx/androidkit
transfuse Transfuse - A Dependency Injection and Integration framework for Google Android
https://github.com/johncarl81/transfuse
xCombine Android Plugin Framework
https://github.com/wyouflf/xCombine
LoonAndroid 整个框架式不同于androidannotations，Roboguice等ioc框架，这是一个类似spring的实现方式。在整应用的生命周期中找到切入点，然后对activity的生命周期进行拦截，然后插入自己的功能。
https://github.com/gdpancheng/LoonAndroid
UltimateAndroid UltimateAndroid is a framework to help developing Android apps in a fast way
https://github.com/cymcsg/UltimateAndroid
BeeFramework_Android 极简化的Android App开发框架和App内调试工具
https://github.com/BeeFramework/BeeFramework_Android
RoboMVVM MVVM framework for Android
https://github.com/debdattabasu/RoboMVVM
Android-Next A Android Commons Library, include task, cache, http, custom views, utils, and so on.
https://github.com/mcxiaoke/Android-Next
SwissKnife A multi-purpose library containing view injection and threading for Android using annotations
https://github.com/Arasthel/SwissKnife
QuickAndroid 一个快速、完善的Android开发框架整合实践
https://github.com/alafighting/QuickAndroid
CJFrameForAndroid CJFrameForAndroid 是一个实现android插件化开发的框架。使用CJFrameForAndroid，apk动态加载不再是难题，更重要的是可以轻松实现插件与APP项目之间的解耦。
https://github.com/kymjs/CJFrameForAndroid

###</ EventBus

EventBus Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.
https://github.com/greenrobot/EventBus
otto An enhanced Guava-based event bus with emphasis on Android support.
https://github.com/square/otto
Guava's event bus Guava's event bus utility, explained.
https://code.google.com/p/guava-libraries/wiki/EventBusExplained
RxJava RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
https://github.com/ReactiveX/RxJava
RxAndroid RxJava bindings for Android
https://github.com/ReactiveX/RxAndroid
tinybus A lightweight and simple event bus optimized for Android
https://github.com/beworker/tinybus
NetworkEvents Android library listening network connection state and change of the Wifi signal strength
https://github.com/pwittchen/NetworkEvents
AndroidEventBus A lightweight eventbus library for android, simplifies communication between Activities, Fragments, Threads, Services, etc.
https://github.com/bboyfeiyu/AndroidEventBus

###</ Orm

greenDAO greenDAO is a light & fast ORM solution for Android that maps objects to SQLite databases.
https://github.com/greenrobot/greenDAO
ormlite ORMLite Android functionality used in conjunction with ormlite-core
https://github.com/j256/ormlite-android
ActiveAndroid Active record style SQLite persistence for Android
https://github.com/pardom/ActiveAndroid
sugar Insanely easy way to work with Android Database.
https://github.com/satyan/sugar
androrm An Object Relational Mapper for Android.
https://github.com/androrm/androrm/
orman lightweight and practical ORM for Java/Android. works with SQLite & MySQL.
https://github.com/ahmetalpbalkan/orman
ormdroid ORMDroid is a simple ORM persistence framework for your Android applications.
https://github.com/roscopeco/ormdroid
android-sqlite-asset-helper An Android helper class to manage database creation and version management using an application's raw asset files
https://github.com/jgilfelt/android-sqlite-asset-helper
sprinkles Sprinkles is a boiler-plate-reduction-library for dealing with databases in android applications
https://github.com/emilsjolander/sprinkles
android-database-sqlcipher Android SQLite API based on SQLCipher
https://github.com/sqlcipher/android-database-sqlcipher
couchbase-lite-android Lightweight, embedded, syncable NoSQL database engine for Android.
https://github.com/couchbase/couchbase-lite-android
SimpleNoSQL A simple NoSQL client for Android. Meant as a document store using key/value pairs and some rudimentary querying. Useful for avoiding the hassle of SQL code.
https://github.com/Jearil/SimpleNoSQL
SQLiteProvider Extended SQLite functionality for Android
https://github.com/novoda/SQLiteProvider
Android-AnnotatedSQL Android library for auto generating SQL schema and Content provider
https://github.com/hamsterksu/Android-AnnotatedSQL
DBExecutor DBExecutor
https://github.com/LuckyJayce/DBExecutor
LitePal An Android library that allows developers to use SQLite database extremely easy.
https://github.com/LitePalFramework/LitePal
realm-java Realm is a mobile database: a replacement for SQLite & ORMs
https://github.com/realm/realm-java
DBFlow A blazing fast, powerful, and very simple ORM android database library that writes database code for you.
https://github.com/agrosner/DBFlow

###</ Image Loading

Android-Universal-Image-Loader Powerful and flexible library for loading, caching and displaying images on Android.
https://github.com/nostra13/Android-Universal-Image-Loader
picasso A powerful image downloading and caching library for Android
https://github.com/square/picasso
picasso-transformations An Android transformation library providing a variety of image transformations for Picasso
https://github.com/wasabeef/picasso-transformations
ion Android Asynchronous Networking and Image Loading
https://github.com/koush/ion
glide An image loading and caching library for Android focused on smooth scrolling
https://github.com/bumptech/glide
glide-transformations An Android transformation library providing a variety of image transformations for Glide.
https://github.com/wasabeef/glide-transformations
ImageLoader Library for async image loading and caching on Android
https://github.com/novoda/ImageLoader
webimageloader Library to handle asynchronous image loading on Android.
https://github.com/lexs/webimageloader
AndroidImageLoader Andorid library that loads images asynchronously into cache using a thread pool
https://github.com/wuman/AndroidImageLoader

###</ Animations

ListViewAnimations An Android library which allows developers to easily add animations to ListView items
https://github.com/nhaarman/ListViewAnimations
NineOldAndroids Android library for using the Honeycomb animation API on all versions of the platform back to 1.0!
https://github.com/JakeWharton/NineOldAndroids
android-flip A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
https://github.com/openaphid/android-flip
AndroidViewAnimations Cute view animation collection.
https://github.com/daimajia/AndroidViewAnimations
AnimationEasingFunctions Android Animation Easing Functions. Let's make animation more real!
https://github.com/daimajia/AnimationEasingFunctions
ViewPagerTransforms Library containing common animations needed for transforming ViewPager scrolling for Android v13+.
https://github.com/ToxicBakery/ViewPagerTransforms
TransitionsBackport A backport of the new Transitions API for Android
https://github.com/guerwan/TransitionsBackport
RecyclerViewItemAnimators This repo provides simple animators for the item views in the RecyclerView This code is cloned from DefaultItemAnimator provided by Google customizing the animations.
https://github.com/gabrielemariotti/RecyclerViewItemAnimators
ParallaxPagerTransformer A pager for Android with parallax effect
https://github.com/xgc1986/ParallaxPagerTransformer
android-page-curl Page Curl for Android
https://github.com/MysticTreeGames/android-page-curl
android-cubic-bezier-interpolator An Android Library that helps you implement bezier animations in you application
https://github.com/codesoup/android-cubic-bezier-interpolator
ActivityTransition An android project presenting some transitions you can use between activities
https://github.com/ophilbert/ActivityTransition
EasyAndroidAnimations Easy Android Animations is an animation library that aims to make android animations easier, with 50+ builtin animations, it allows you to introduce many complex animation effects in your application with one or two lines of code.
https://github.com/2359media/EasyAndroidAnimations
AndroidImageSlider An amazing and convenient Android image slider.
https://github.com/daimajia/AndroidImageSlider
transitions-everywhere Backport of Transitions API from Android 4.4. Compatible with Android 2.2+
https://github.com/andkulikov/transitions-everywhere
android-ripple-background A beautiful ripple animation for your app
https://github.com/skyfishjy/android-ripple-background
CircleIndicator a lightweight viewpager indicator like in nexus 5 launcher
https://github.com/ongakuer/CircleIndicator
Interactive-animation Collect android animation
https://github.com/Rano1/Interactive-animation
Slidr Easily add slide to dismiss functionality to an Activity
https://github.com/r0adkll/Slidr
CircularReveal Lollipop ViewAnimationUtils.createCircularReveal for everyone 2.3+
https://github.com/ozodrukh/CircularReveal
BaseAnimation BaseAnimation network Android animation set, custom controls, nearly 200 kinds of source code！ BaseAnimation, if a new version is updated automatically to remind everyone, I hope everyone will contribute their animated XML files or other source, together to create this open source app！
https://github.com/z56402344/BaseAnimation

###</ Network

android-async-http An Asynchronous HTTP Library for Android
https://github.com/loopj/android-async-http
okhttp An HTTP+SPDY client for Android and Java applications.
https://github.com/square/okhttp
retrofit Type-safe REST client for Android and Java by Square, Inc.
https://github.com/square/retrofit
AndroidAsync Asynchronous socket, http (client+server), websocket, and socket.io library for android. Based on nio, not threads.
https://github.com/koush/AndroidAsync
async-http-client Asynchronous Http and WebSocket Client library for Java
https://github.com/AsyncHttpClient/async-http-client
http-request Java HTTP Request Library
https://github.com/kevinsawicki/http-request
android-lite-http Arrow(LiteHttp) is a simple, intelligent and flexible HTTP client for Android.
https://github.com/litesuits/android-lite-http
robospice Repo of the Open Source Android library : RoboSpice. RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules.
https://github.com/stephanenicolas/robospice
volley volley https://github.com/mcxiaoke/android-volley
enhanced-volley An enhanced version of the Volley Networking Toolkit for Android
https://github.com/vinaysshenoy/enhanced-volley
unirest-java Unirest in Java: Simplified, lightweight HTTP client library.
https://github.com/mashape/unirest-java/
wasp Android Network Solution
https://github.com/orhanobut/wasp

###</ Widget ####</ Material

MaterialDesignLibrary This is a library with components of Android L to you use in android 4.0
https://github.com/navasmdc/MaterialDesignLibrary#flat-button
Carbon Material Design implementation for Android 2.1+. Realtime shadows, ripples, animations, SVGs and more. https://github.com/ZieIony/Carbon
MaterialEverywhere Showcase of the new AppCompat 21, which includes new Material Theme, working in pre-21 devices.
https://github.com/antoniolg/MaterialEverywhere
MaterialWidget Android L design widget in Android 4.0 ~ 4.4.
https://github.com/keithellis/MaterialWidget
MaterialTabs Custom Tabs with Material Design effects. It requires 14+ API and android support v7 (Toolbar)
https://github.com/neokree/MaterialTabs
material-ripple Android L Ripple effect wrapper for Views
https://github.com/balysv/material-ripple
RippleEffect Implementation of Ripple effect from Material Design for Android API 14+
https://github.com/traex/RippleEffect
LDrawer Android drawer icon with material design animation
https://github.com/ikimuhendis/LDrawer
material-design-icons Material Design icons by Google
https://github.com/google/material-design-icons
AndroidMaterialDesignToolbar Android Sample Project with Material Design and Toolbar.
https://github.com/tekinarslan/AndroidMaterialDesignToolbar
MaterialEditText EditText in Material Design
https://github.com/rengwuxian/MaterialEditText
material-menu Morphing Android menu, back, dismiss and check buttons
https://github.com/balysv/material-menu
material-dialogs Not even AppCompat uses Material theming for AlertDialogs on pre-Lollipop. This is a beautiful and easy solution.
https://github.com/afollestad/material-dialogs
MaterialNavigationDrawer Navigation Drawer Activity with material design style and simplified methods
https://github.com/neokree/MaterialNavigationDrawer
MaterialDialog An Android library for conveniently building Material Design Dialog in Android version 2.2 ~ L.
https://github.com/drakeet/MaterialDialog
materialish-progress A material style progress wheel compatible with 2.3
https://github.com/pnikosis/materialish-progress
MaterialList An Android library aimed to get the beautiful CardViews that Google shows at its official design specifications
https://github.com/dexafree/MaterialList
android-floating-action-button Floating Action Button for Android based on Material Design specification
https://github.com/futuresimple/android-floating-action-button
Android-Material-circular-button Animated Material circular button
https://github.com/glomadrian/Android-Material-circular-button
material-drawer DrawerLayout implementation for Material design apps
https://github.com/HeinrichReimer/material-drawer
snackbar Snackbar Android Library
https://github.com/nispok/snackbar
Android-DialogFragments Various DialogFragments for Android.
https://github.com/wada811/Android-DialogFragments
material-range-bar Android widget for selecting a range of values.
https://github.com/oli107/material-range-bar
CircularProgressView A Material style circular progress bar for Android
https://github.com/rahatarmanahmed/CircularProgressView
RippleDrawable A port of Ripple Effect from Android L to non L devices
https://github.com/ozodrukh/RippleDrawable
MaterialDrawer A simple take on creating a easy to use and fast material drawer implementation
https://github.com/mikepenz/MaterialDrawer

####</ UI

android-ui Android UI library. Requires API level 14+
https://github.com/markushi/android-ui
GreenDroid GreenDroid is a development library for the Android platform. It makes UI developments easier and consistent through your applications.
https://github.com/cyrilmottier/GreenDroid
FlatUI CengaLabs - Android FlatUI Kit
https://github.com/eluleci/FlatUI
EffectiveAndroidUI Sample project created to show some of the best Android practices to work in the Android UI Layer. The UI layer of this project has been implemented using MVP or MVVM (without binding engine) to show how this patterns works. This project is used during the talk "EffectiveAndroidUI".
https://github.com/pedrovgs/EffectiveAndroidUI
ParallaxEverywhere Parallax everywhere is a library with alternative android widgets with parallax effects.
https://github.com/Narfss/ParallaxEverywhere

####</ TextView/EditText

Shimmer-android An Android TextView with a shimmering effect
https://github.com/RomainPiel/Shimmer-android
Titanic Android experiment showing a sinking TextView
https://github.com/RomainPiel/Titanic
emojicon A library to show emoji in TextView, EditText (like WhatsApp) for Android
https://github.com/rockerhieu/emojicon
android-autofittextview A TextView that automatically resizes text to fit perfectly within its bounds.
https://github.com/grantland/android-autofittextview
Android-RobotoTextView Implementation of a TextView and all its direct/indirect subclasses with native support for the Roboto fonts, includes the brand new Roboto Slab fonts.
https://github.com/johnkil/Android-RobotoTextView
SizeAdjustingTextView This is based on an open source autosizing textview for Android.
https://github.com/erchenger/SizeAdjustingTextView
SecretTextView A TextView that simulates the effect from the app Secret where the characters fade in/out at different speeds.
https://github.com/matthewrkula/SecretTextView
anytextview An extension of Android's TextView and EditText that let's you use the font of your choice
https://github.com/hanspeide/anytextview
android-formidable-validation Form validation and feedback library for Android. Provides .setText for more than just TextView and EditText widgets. Provides easy means to validate with dependencies.
https://github.com/coreform/android-formidable-validation
android-edittext-validator Android form edit text is an extension of EditText that brings data validation facilities to the edittext.
https://github.com/vekexasia/android-edittext-validator
chips-edittext-library Chips EditText, Token EditText, Bubble EditText, Spannable EditText and etc.. There are many names of this control. Here I develop easy to understand , modify and integrate Chips Edit Text widget for Android
https://github.com/kpbird/chips-edittext-library
FloatingLabel FloatingLabel Allows you to create a blow kind of EditText.
https://github.com/hardik-trivedi/FloatingLabel
AndroidFloatLabel Float Label Edit Texts for Android
https://github.com/weddingparty/AndroidFloatLabel
AndroidFloatLabel Library project with a custom view that implements the Float Label pattern
https://github.com/IanGClifton/AndroidFloatLabel
TokenAutoComplete Gmail style MultiAutoCompleteTextView for Android
https://github.com/splitwise/TokenAutoComplete
TextJustify-Android Android Text Full Jusiftication / Wrapping / Justify
https://github.com/bluejamesbond/TextJustify-Android
RoundedLetterView RoundedLetterView like the one in Android 5.0 Contacts app
https://github.com/pavlospt/RoundedLetterView
Android-SingleInputForm A single EditText instead of a classical form. Library that implements flavienlaurent's singleinputform
https://github.com/HeinrichReimer/Android-SingleInputForm
BabushkaText A simpler way to style your TextViews
https://github.com/quiqueqs/BabushkaText
MatchView Include MatchTextView and MatchButton..Come..you will like it
https://github.com/Rogero0o/MatchView
ExpandableTextView Android's TextView that can expand/collapse like the Google Play's app description
https://github.com/Manabu-GT/ExpandableTextView
AccountAutoCompleteEditText Simple extension for account suggestion and auto completion.
https://github.com/KeithYokoma/AccountAutoCompleteEditText
TokenAutoComplete Gmail style MultiAutoCompleteTextView for Android
https://github.com/splitwise/TokenAutoComplete
AwesomeText A tool that facilitates working with Spans on TextViews or any extension of them (EditTexts, Buttons...).
https://github.com/JMPergar/AwesomeText

####</ ImageView

PhotoView Implementation of ImageView for Android that supports zooming, by various touch gestures.
https://github.com/chrisbanes/PhotoView
android-smart-image-view Android ImageView replacement which allows image loading from URLs or contact address book, with caching
https://github.com/loopj/android-smart-image-view
TouchImageView Adds touch functionality to Android ImageView.
https://github.com/MikeOrtiz/TouchImageView
CircleImageView A fast circular ImageView perfect for profile images.
https://github.com/hdodenhof/CircleImageView
gesture-imageview This is a simple Android View class which provides basic pinch and zoom capability for images.
https://github.com/jasonpolites/gesture-imageview
android-shape-imageview Custom shaped android imageview components
https://github.com/siyamed/android-shape-imageview
AndroidImageCrop How select and crop image on Android
https://github.com/lorensiuswlt/AndroidImageCrop
GifImageView Android ImageView that handles animated GIF images
https://github.com/felipecsl/GifImageView
cropper Android widget for cropping and rotating an image.
https://github.com/edmodo/cropper
ImageViewZoom Android ImageView widget with zoom and pan capabilities
https://github.com/sephiroth74/ImageViewZoom
CircularImageView Custom view for circular images in Android while maintaining the best draw performance
https://github.com/Pkmmte/CircularImageView
CircularImageView Create circular image view in android
https://github.com/lopspower/CircularImageView
android-crop Android library project for cropping images
https://github.com/jdamcd/android-crop
cropimage Replacement for deprecated official Android crop image function
https://github.com/biokys/cropimage
android-cropimageCropImage Activity from Gallery.apk packaged as a reusable Android library (4.0 and up).
https://github.com/lvillani/android-cropimage
android-gpuimage Android filters based on OpenGL (idea from GPUImage for iOS)
https://github.com/CyberAgent/android-gpuimage
gif-movie-view Android View widget for displaying GIF animations. https://github.com/sbakhtiarov/gif-movie-view
WaveDrawable Drawable animation inspired by Tinder.
https://github.com/Alexrs95/WaveDrawable
DrawerArrowDrawable Visual back-port of the rotating drawer-to-arrow drawable from Android L
https://github.com/ChrisRenke/DrawerArrowDrawable
TextDrawable This light-weight library provides images with letter/text like the Gmail app. It extends the Drawable class thus can be used with existing/custom/network ImageView classes. Also included is a fluent interface for creating drawables and a customizable ColorGenerator.
https://github.com/amulyakhare/TextDrawable
SelectableRoundedImageView Android ImageView that supports different radiuses on each corner. It also supports oval(and circle) shape and border. This would be especially useful for using inside CardView which should be rounded only top left and top right corners(Don't forget to call setPreventCornerOverlap(false) on your cardview).
https://github.com/pungrue26/SelectableRoundedImageView
avatar-android Rounded and Squared Avatar for Android Applications
https://github.com/Pedroafa/avatar-android
ByakuGallery ByakuGallery is an open source Android library that allows the visualization of large images with gesture capabilities. This lib is based on AOSP Camera2.
https://github.com/diegocarloslima/ByakuGallery

####</ Button

circular-progress-button Android Circular Progress Button
https://github.com/dmytrodanylyk/circular-progress-button
android-process-button Android Buttons With Built-in Progress Meters.
https://github.com/dmytrodanylyk/android-process-button
android-circlebutton Circle button widget for Android
https://github.com/markushi/android-circlebutton
android-flat-button FButton - a flat button library for Android
https://github.com/hoang8f/android-flat-button
FloatingActionButton Android Google+ like floating action button
https://github.com/makovkastar/FloatingActionButton
ExpandableButtonMenu An Android library for an expandable button menu
https://github.com/lemonlabs/ExpandableButtonMenu
fancybuttons An Android library to easily create fancy buttons without the need of drawable files.
https://github.com/medyo/fancybuttons
Android-Bootstrap Bootstrap style buttons with Font Awesome
https://github.com/Bearded-Hen/Android-Bootstrap
SwitchButton SwitchButton
https://github.com/kyleduo/SwitchButton
ToggleButton ToggleButton Widget For Android Dev
https://github.com/zcweng/ToggleButton

####</ Progressbar/Progress View

SmoothProgressBar A small Android library allowing you to have a smooth and customizable horizontal indeterminate ProgressBar
https://github.com/castorflex/SmoothProgressBar
NumberProgressBar A beautiful, slim Android ProgressBar.
https://github.com/daimajia/NumberProgressBar
android-HoloCircularProgressBar Holo Circular ProgressBar
https://github.com/passsy/android-HoloCircularProgressBar
android-square-progressbar An android library to display a progressbar that goes around an image.
https://github.com/mrwonderman/android-square-progressbar
ProgressPieView Android library for showing progress in a highly customizable pie.
https://github.com/FilipPudak/ProgressPieView
GoogleProgressBar Android library to display progress like google does in some of his services.
https://github.com/jpardogo/GoogleProgressBar
ProgressWheel A progress wheel for android, intended for use instead of the standard progress bar.
https://github.com/Todd-Davies/ProgressWheel
RefreshActionItem Android - An action bar item which acts both as a refresh button and as a progress indicator
https://github.com/ManuelPeinado/RefreshActionItem
CircleProgress CircleProgress, DonutProgress, ArcProgress
https://github.com/lzyzsd/CircleProgress
WaveView A wave view of android,can be used as progress bar.
https://github.com/john990/WaveView
water-wave-progress 水波按进度上升，带环形进度条
https://github.com/Modificator/water-wave-progress
InfiniteIndicator This lib can be used for viewpager infinite loop with indicator easily.
https://github.com/lightSky/InfiniteIndicator
Android-RoundCornerProgressBar Round Corner Progress Bar Library for Android
https://github.com/akexorcist/Android-RoundCornerProgressBar

####</ Menu

SlidingMenu SlidingMenu is an Open Source Android library that allows developers to easily create applications with sliding menus like those made popular in the Google+, YouTube, and Facebook apps. Feel free to use it all you want in your Android apps provided that you cite this project and include the license in your app.
https://github.com/jfeinstein10/SlidingMenu
android-menudrawer A slide-out menu implementation, which allows users to navigate between views in your app.
https://github.com/SimonVT/android-menudrawer
ArcMenu An android custom view which looks like the menu in Path 2.0 (for iOS).
https://github.com/daCapricorn/ArcMenu
RibbonMenu Navigation menu for Android (based off Google+ app)
https://github.com/darvds/RibbonMenu
CircularFloatingActionMenu an animated circular menu for Android
https://github.com/oguzbilgener/CircularFloatingActionMenu
ActionsContentView ActionsContentView is an standalone library implements actions/content swiping view (AKA Side Navigation UI Pattern, AKA Facebook side menu). The library doesn't use any specific code introduced in new Android SDK versions. This allows develop an application with an action/content swiping view for every version of Android from 2.2 and up. https://github.com/StevenRudenko/ActionsContentView
Android-NewPopupMenu Android-NewPopupMenu is an android library to create popup menu with GoogleMusic app-like style.
https://github.com/u1aryz/Android-NewPopupMenu
android-floating-action-menu Floating Action Menu for Android. Inspired by the Google Plus floating menu.
https://github.com/sephiroth74/android-floating-action-menu
Android-CircleMenu Menu with items on a rotating circle
https://github.com/szugyi/Android-CircleMenu
Android Wheel Menu Simple and easy to use circular menu widget for Android.
https://github.com/anupcowkur/Android-Wheel-Menu
android-satellite-menu Android Satellite Menu
https://github.com/siyamed/android-satellite-menu
SideNavigation Implementation of "SIde Navigation" or "Fly-in app menu" pattern for Android (based on Google+ app)
https://github.com/johnkil/SideNavigation
AndroidResideMenu The idea of ResideMenu is from Dribbble 1 and 2. It has come true and run in iOS devices. iOS ResideMenu This project is the RefsideMenu Android version. The visual effect is partly referred to iOS version of ResideMenu. And thanks to the authors for the above idea and contribution.
https://github.com/SpecialCyCi/AndroidResideMenu
GoogleNavigationDrawerMenu Android Library for a DrawerLayout similar to the one in Google Apps
https://github.com/Arasthel/GoogleNavigationDrawerMenu
simple-side-drawer Simple library which enable you to add a drawer(slide-out) navigation to your android application
https://github.com/adamrocker/simple-side-drawer
BlurNavigationDrawer Android - Blur Navigation Drawer like Etsy app.
https://github.com/charbgr/BlurNavigationDrawer
ActionSheetForAndroid IOS UIActionSheet in Android
https://github.com/baoyongzhang/ActionSheetForAndroid
BottomSheet One way to present a set of actions to a user is with bottom sheets, a sheet of paper that slides up from the bottom edge of the screen. Bottom sheets offer flexibility in the display of clear and simple actions that do not need explanation.
https://github.com/soarcn/BottomSheet
Context-Menu.Android Context-Menu.Android
https://github.com/Yalantis/Context-Menu.Android
Side-Menu.Android Side-Menu.Android
https://github.com/Yalantis/Side-Menu.Android
Android-CircleMenu 自定义ViewGroup实现的圆形旋转菜单，支持跟随手指旋转以及快速旋转。图标请勿商用。 https://github.com/hongyangAndroid/Android-CircleMenu
AndroidPullMenu An Android Library that allows users to pull down a menu and select different actions. It can be implemented inside ScrollView, GridView, ListView.
https://github.com/ShkurtiA/AndroidPullMenu

####</ Dialog

QustomDialog a quick custom android dialog project
https://github.com/danoz73/QustomDialog
Android-RateThisApp Android library to show "Rate this app" dialog
https://github.com/kskkbys/Android-RateThisApp
AndroidSliderPreference Android library that allows applications to add dialog-based slider widgets to their settings
https://github.com/jayschwa/AndroidSliderPreference
L-Dialogs A small library replicating the new dialogs in android L.
https://github.com/lewisjdeane/L-Dialogs
LicensesDialog LicensesDialog is an open source library to display licenses of third-party libraries in an Android app.
https://github.com/PSDev/LicensesDialog
android-styled-dialogs A simple library for styling Android dialogs in the Holo theme. It also removes boilerplate code for displaying simple dialogs.
https://github.com/inmite/android-styled-dialogs
PostOffice This is a library for easily constructing Holo and Material Design Dialogs.
https://github.com/r0adkll/PostOffice
sweet-alert-dialog Android版的SweetAlert，清新文艺，快意灵动的甜心弹框
https://github.com/pedant/sweet-alert-dialog
BlurDialogFragment Library project to display DialogFragment with a blur effect.
https://github.com/tvbarthel/BlurDialogFragment

####</ ListView/ScrollView

pinned-section-listview Easy to use ListView with pinned sections for Android.
https://github.com/beworker/pinned-section-listview
PullToRefresh-ListView A generic, customizable, open source Android ListView implementation that has 'Pull to Refresh' functionality.
https://github.com/erikwt/PullToRefresh-ListView
FlabbyListView Android library to display a ListView whose cells are not rigid but flabby and react to ListView scroll.
https://github.com/jpardogo/FlabbyListView
XListView-Android ListView supports pull refresh and pull up to load more feature.
https://github.com/Maxwin-z/XListView-Android
PinterestListView Pinterest style ListView for Android
https://github.com/vladexologija/PinterestListView
android-pulltorefresh-and-loadmore android custom listview,with interaction pattern load more and pull to refresh to load data dinamically
https://github.com/shontauro/android-pulltorefresh-and-loadmore
PinnedHeaderListView A ListView with pinned section headers for Android
https://github.com/JimiSmith/PinnedHeaderListView
ParallaxScroll Parallax ScrollView and ListView for Android
https://github.com/nirhart/ParallaxScroll
Android-HorizontalListView HorizontalListView is an Android ListView widget which scrolls in a horizontal manner (in contrast with the SDK-provided ListView which scrolls vertically).
https://github.com/MeetMe/Android-HorizontalListView
LinearListView Android library that allows you to bind a LinearLayout with a ListAdapter.
https://github.com/frankiesardo/LinearListView
ParallaxListView A Android ListView Demo with a parallax effect header like Path.
https://github.com/Gnod/ParallaxListView
PagedHeadListView Android boosted ListView supporting paginated header with a new material page indicator.
https://github.com/JorgeCastilloPrz/PagedHeadListView
PullZoomView An Android custom ListView and ScrollView with pull to zoom-in.
https://github.com/Frank-Zhu/PullZoomView
HeaderListView Android ListView with sticky headers
https://github.com/applidium/HeaderListView
ListviewFilter Awesome Listview filter functionality in Android.
https://github.com/bhavyahmehta/ListviewFilter
android-accordion-view Simple ListView based Android AccordionView
https://github.com/hamsterready/android-accordion-view
DragNDropList An easy to use Drag & Drop List for Android. Direct replacement of the android ListView.
https://github.com/terlici/DragNDropList
QuickReturn Android ListView that implements the QuickReturn UI pattern. Written from scratch with focus on performance.
https://github.com/felipecsl/QuickReturn
Android-HorizontalListView HorizontalListView is an Android ListView widget which scrolls in a horizontal manner
https://github.com/MeetMe/Android-HorizontalListView
ZrcListView 一个顺滑又漂亮的Android下拉刷新与加载更多列表组件。
https://github.com/zarics/ZrcListView
android-swipelistview An Android List View implementation with support for drawable cells and many other swipe related features
https://github.com/47deg/android-swipelistview
android-pulltorefresh This project aims to provide a reusable pull to refresh widget for Android.
https://github.com/johannilsson/android-pulltorefresh
StickyListHeaders An android library for section headers that stick to the top
https://github.com/emilsjolander/StickyListHeaders
LazyList Lazy load of images in Android
https://github.com/thest1/LazyList
FloatingGroupExpandableListView An open source Android library that provides a floating group view at the top of the ExpandableListView
https://github.com/diegocarloslima/FloatingGroupExpandableListView
PullSeparateListView 到顶部或底部时拉动，item分离效果
https://github.com/chiemy/PullSeparateListView
Android-SlideExpandableListView A better ExpandableListView, with animated expandable views for each list item
https://github.com/tjerkw/Android-SlideExpandableListView
HorizontalVariableListView Horizontal list view for Android which allows variable items widths
https://github.com/sephiroth74/HorizontalVariableListView
ListBuddies Android library to achieve in an easy way, the behaviour of the home page in the Expedia app, with a pair of auto-scroll circular parallax ListViews.
https://github.com/jpardogo/ListBuddies
Android-Tiling-ScrollView A tiling scrollview to display large picture (similar to iOS "CATiledLayer")
https://github.com/ened/Android-Tiling-ScrollView
PullScrollView 1.仿照新浪微博Android客户端个人中心的ScrollView，下拉背景伸缩回弹效果。 2.ScrollView仿IOS回弹效果。
https://github.com/MarkMjw/PullScrollView
StickyScrollViewItems A small android library for tagging views inside a ScrollView as "sticky" making them stick to the top of the scroll container until a new sticky view comes and takes it's place
https://github.com/emilsjolander/StickyScrollViewItems
Discrollview Scroll + discover = DiscrollView
https://github.com/flavienlaurent/discrollview
SwipeMenuListView SwipeMenuListView
https://github.com/baoyongzhang/SwipeMenuListView
Android-ObservableScrollView Android library to observe scroll events on scrollable views.
https://github.com/ksoichiro/Android-ObservableScrollView
Pull-to-Refresh.Rentals-Android This project aims to provide a simple and customizable pull to refresh implementation. Made in Yalantis
https://github.com/Yalantis/Pull-to-Refresh.Rentals-Android
StikkyHeader This is a very simple library for Android that allows you to stick an header to a scrollable view and easly apply animation to it
https://github.com/carlonzo/StikkyHeader
quickscroll Bringing extended scrolling features to Android's native ListView and ExpandableListView.
https://github.com/andraskindler/quickscroll

####</ GridView

two-way-gridview An Android GridView that can be configured to scroll horizontally or vertically
https://github.com/jess-anders/two-way-gridview
AsymmetricGridView Android ListView that mimics a GridView with asymmetric items. Supports items with row span and column span
https://github.com/felipecsl/AsymmetricGridView
AndroidCoolDragAndDropGridView An example of a gridview with various column span items and drag and drop support like Google keep has
https://github.com/theredsunrise/AndroidCoolDragAndDropGridView
GridViewHeader Android GridView with addHeader( View view ) function
https://github.com/munix/GridViewHeader
DynamicGrid Drag and drop GridView for Android
https://github.com/askerov/DynamicGrid
PagingGridView A Paging GridView with the same behavior as PagingListView.
https://github.com/nicolasjafelle/PagingGridView
DraggableGridView A drag-and-drop scrolling grid view for Android
https://github.com/thquinn/DraggableGridView
AndroidStaggeredGrid An Android staggered grid view which supports multiple columns with rows of varying sizes.
https://github.com/etsy/AndroidStaggeredGrid
StaggeredGridView A modified version of Android's experimental StaggeredGridView. Includes own OnItemClickListener and OnItemLongClickListener, selector, and fixed position restore.
https://github.com/maurycyw/StaggeredGridView
android-GridViewWithHeaderAndFooter GridView with Header and Footer
https://github.com/liaohuqiu/android-GridViewWithHeaderAndFooter
DynamicGrid Drag and drop GridView for Android
https://github.com/askerov/DynamicGrid

####</ RatingView

SimpleRatingView A rating toggle for Android which switches between 3 rating levels: positive, neutral, and negative.
https://github.com/xiprox/SimpleRatingView

####</ Recyclerview

recyclerview-animators An Android library which easily add itemanimator to RecyclerView items.
https://github.com/wasabeef/recyclerview-animators
SuperRecyclerView Pumped up RecyclerView
https://github.com/Malinskiy/SuperRecyclerView
DynamicRecyclerView Set of plugable extenstions for Android RecyclerView
https://github.com/ismoli/DynamicRecyclerView

####</ ViewPager

Android-ViewPagerIndicator Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock. Originally based on Patrik Åkerfeldt's ViewFlow.
https://github.com/JakeWharton/Android-ViewPagerIndicator
ViewPagerExtensions A set of custom views for the ViewPager from the Android Support Package
https://github.com/astuetz/ViewPagerExtensions
parallaxviewpager An easy-to-use ViewPager subclass with parallax background effect for Android apps.
https://github.com/andraskindler/parallaxviewpager
android-auto-scroll-view-pager Android auto scroll viewpager or viewpager in viewpager
https://github.com/Trinea/android-auto-scroll-view-pager
NumericPageIndicator Android - A ViewPager page indicator that displays the current page number and (optionally) the page count
https://github.com/ManuelPeinado/NumericPageIndicator
VerticalViewPager Vertical implementation of Android ViewPager
https://github.com/LambergaR/VerticalViewPager
InfiniteViewPager Augment Android's ViewPager with wrap-around functionality.
https://github.com/antonyt/InfiniteViewPager
ViewPager3D Extension of Android ViewPager with a 3D swipe effect
https://github.com/inovex/ViewPager3D
LoopingViewPager An android ViewPager extension allowing infinite scrolling
https://github.com/imbryk/LoopingViewPager

####</ ActionBar

ActionBarSherlock Action bar implementation which uses the native action bar on Android 4.0+ and a custom implementation on pre-4.0 through a single API and theme.
https://github.com/JakeWharton/ActionBarSherlock
TabBarView An Android Library to help you create actionbar tabs like "Capitaine train" app by Cyril Mottier
https://github.com/Mirkoddd/TabBarView
android-extendedactionbar An example of how to extend the ActionBar under the status bar from the theme
https://github.com/Takhion/android-extendedactionbar
FadingActionBar Android library implementing a fading effect for the action bar, similar to the one found in the Play Music app
https://github.com/ManuelPeinado/FadingActionBar
GlassActionBar Android - a library that adds a glass-like effect to the action bar.
https://github.com/ManuelPeinado/GlassActionBar

####</ Fragment

Android-CircularRevealFragment A demo about how to show and hide fragments using the new Android Lollipop circle reveal transitions. Minimum API level is 21
https://github.com/ferdy182/Android-CircularRevealFragment

####</ Tabs

####</ Toast

Crouton Context sensitive notifications for Android
https://github.com/keyboardsurfer/Crouton
SuperToasts A library that extends the Android toast framework.
https://github.com/JohnPersano/SuperToasts
Android-AppMsg In-layout notifications. Based on Toast notifications and article by Cyril Mottier
https://github.com/johnkil/Android-AppMsg
MessageBar An Android Toast replacement, similar to the one seen in the GMail app.
https://github.com/SimonVT/MessageBar
SnackBar toast-like alert pattern for Android
https://github.com/MrEngineer13/SnackBar

####</ SeekBar

HoloCircleSeekBar A Circle SeekBar inspired by Android Holo ColorPicker designed by Marie Schweiz and developed by Lars Werkman.
https://github.com/JesusM/HoloCircleSeekBar
AndroidCircularSeekBar A circular seek bar for Android
https://github.com/RaghavSood/AndroidCircularSeekBar
circularseekbar Custom circular SeekBar (Circle, Semi-circle, and Ellipse) View/Widget for Android
https://github.com/devadvance/circularseekbar
StartPointSeekBar StartPointSeekBar is a custom view for the Android platform that makes it possible to have a SeekBar to have custom start point.
https://github.com/vashisthg/StartPointSeekBar
SeekArc Circular SeekBar view for Android
https://github.com/TriggerTrap/SeekArc
discreteSeekBar DiscreteSeekbar is my poor attempt to develop an android implementation of the Discrete Slider component from the Google Material Design Guidelines.
https://github.com/AnderWeb/discreteSeekBar
discreteSeekBar DiscreteSeekbar is my poor attempt to develop an android implementation of the Discrete Slider component from the Google Material Design Guidelines.
https://github.com/AnderWeb/discreteSeekBar
android-comboseekbar seekbar with distinct values
https://github.com/karabaralex/android-comboseekbar
RangeSeekbar A seekbar contains two cursor(left and right). Multiple touch supported.
https://github.com/dolphinwang/RangeSeekbar

####</ Calendar View

Caldroid Caldroid is a fragment that display calendar with dates in a month. Caldroid can be used as embedded fragment, or as dialog fragment. User can also swipe left/right to navigate to different months.
https://github.com/roomorama/Caldroid
android-times-square Standalone Android widget for picking a single date from a calendar view.
https://github.com/square/android-times-square
calendar-widget The Android calendar widget is home screen widget for your Android device. It displays a list of upcoming calendar events so that you can easily have a glimpse at your upcoming appointments.
https://github.com/plusonelabs/calendar-widget
android-spinnerwheel Wheel-like spinner widget for Android
https://github.com/ai212983/android-spinnerwheel
Android-MonthCalendarWidget A simple example of a responsive Month Calendar app widget for Android
https://github.com/romannurik/Android-MonthCalendarWidget
android-betterpickers Android library for better Picker DialogFragments
https://github.com/derekbrameyer/android-betterpickers
android-calendar-card Android calendar view (like card)
https://github.com/kenumir/android-calendar-card
DateSlider An alternative DatePicker for Android
https://github.com/bendemboski/DateSlider
Android-Week-View Android Week View is an android library to display calendars (week view or day view) within the app. It supports custom styling.
https://github.com/alamkanak/Android-Week-View

####</ Layout

FoldableLayout Android widgets to implement folding animation
https://github.com/alexvasilkov/FoldableLayout
ScalableLayout Scalable Layout For Android
https://github.com/ssomai/ScalableLayout
FlipLayout Android Flip 3D Animation like web Google+
https://github.com/stormzhang/FlipLayout
FlowLayout Android implementation of FlowLayout. Layout arranges its children in multiple rows depending on their width.
https://github.com/blazsolar/FlowLayout
CircleLayout Circular layout for android
https://github.com/dmitry-zaitsev/CircleLayout
ResideLayout An Android Layout which has a same function like https://github.com/romaonthego/RESideMenu
https://github.com/kyze8439690/ResideLayout
GooglePlusLayout GoolgePlusLayout is a custom layout that plays animation on the children views while scrolling as the layout in the Google Plus (android) main page
https://github.com/Nammari/GooglePlusLayout
android-empty-layout A library for showing different types of layouts when a list view is empty
https://github.com/alamkanak/android-empty-layout
ImageLayout Android - A layout that arranges its children in relation to a background image
https://github.com/ManuelPeinado/ImageLayout
android-flowlayout Linear layout, that wrap its content to the next line if there is no space in the current line.
https://github.com/ApmeM/android-flowlayout
AndroidSwipeLayout The Most Powerful Swipe Layout!
https://github.com/daimajia/AndroidSwipeLayout
FreeFlow A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition animations as data and layouts change
https://github.com/Comcast/FreeFlow
SwipeableLayout A swipeable - auto resizing view group for android
https://github.com/wmbest2/SwipeableLayout
SwipeBackLayout An Android library that help you to build app with swipe back gesture.
https://github.com/Issacw0ng/SwipeBackLayout
android_maskable_layout A library that easily allows you to mask layouts/viewgroups
https://github.com/christophesmet/android_maskable_layout
android-gridlayout A backwards compatible implementation of GridLayout for Android
https://github.com/dlew/android-gridlayout
DragLayout An Android Project
https://github.com/BlueMor/DragLayout
ExpandableLayout Implementation of ExpandableListview with custom header and custom content.
https://github.com/traex/ExpandableLayout
android-PullRefreshLayout This component like SwipeRefreshLayout, it is more beautiful than SwipeRefreshLayout.
https://github.com/baoyongzhang/android-PullRefreshLayout
DragTopLayout Drag down to show a view on the top.
https://github.com/chenupt/DragTopLayout

####</ Other

Swipecards A Tinder-like Android library to create the swipe cards effect. You can swipe left or right to like or dislike the content.
https://github.com/Diolor/Swipecards
Android SlideShow Widget A set of widgets to create smooth slide shows with ease.
https://github.com/marvinlabs/android-slideshow-widget
AndroidWheel Custom wheel widget for android
https://github.com/sephiroth74/AndroidWheel
range-bar Android widget for selecting a range of values.
https://github.com/edmodo/range-bar
TileView The TileView widget is a subclass of ViewGroup that provides a mechanism to asynchronously display tile-based images, with additional functionality for 2D dragging, flinging, pinch or double-tap to zoom, adding overlaying Views (markers), built-in Hot Spot support, dynamic path drawing, multiple levels of detail, and support for any relative positioning or coordinate system.
https://github.com/moagrius/TileView
android-switch-backport A backport of the Switch widget (http://developer.android.com/reference/android/widget/Switch.html) that was introduced on Android 4. This port works on Android 2.1+.
https://github.com/BoD/android-switch-backport
android-bootstrap A template/bootstrap/boilerplate application that includes tons of great open source tools and frameworks.
https://github.com/AndroidBootstrap/android-bootstrap
cardslib Android Library to build a UI Card
https://github.com/gabrielemariotti/cardslib
AndroidSlidingUpPanel Android Sliding Up Panel Demo
https://github.com/umano/AndroidSlidingUpPanel
android-viewflow A horizontal view scroller library for Android
https://github.com/pakerfeldt/android-viewflow
android-viewbadger A simple way to "badge" any given Android view at runtime without having to cater for it in layout
https://github.com/jgilfelt/android-viewbadger
DraggablePanel Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component.
https://github.com/pedrovgs/DraggablePanel
android-stackblur Android StackBlur is a library that can perform a blurry effect on a Bitmap based on a gradient or radius, and return the result. The library is based on the code of Mario Klingemann.
https://github.com/kikoso/android-stackblur
StickyGridHeaders An Android Library that makes it easy to make grid views with sectioned data and headers that stick to the top.
https://github.com/TonicArtos/StickyGridHeaders
AndroidViewHover An elegant way to show your menu or messages.
https://github.com/daimajia/AndroidViewHover
SystemBarTint Apply background tinting to the Android system UI when using KitKat translucent modes
https://github.com/jgilfelt/SystemBarTint
chromeview Android WebView implementation that uses the latest Chromium code
https://github.com/pwnall/chromeview
android-iconify Integration of FontAwesome for Android
https://github.com/JoanZapata/android-iconify
StandOut StandOut lets you easily create floating windows in your Android app.
https://github.com/pingpongboss/StandOut
android-sliding-layer-lib This repository host a library that provides an easy way to include an autonomous layer/view that slides from the side of your screen and which is fully gesture ready, the same way as our detail view in Wunderlist 2 does. This pattern can also be seen in Google+’s notification center or in Basecamp’s detail view.
https://github.com/6wunderkinder/android-sliding-layer-lib
Android-SwipeToDismiss Android swipe-to-dismiss mini-library and sample code
https://github.com/romannurik/Android-SwipeToDismiss
HoloColorPicker An Android Holo themed colorpicker designed by Marie Schweiz
https://github.com/LarsWerkman/HoloColorPicker
UnifiedPreference UnifiedPreference is a library for working with all versions of the Android Preference package from API v4 and up.
https://github.com/saik0/UnifiedPreference
aFileChooser Android library that provides a file explorer to let users select files on external storage.
https://github.com/iPaulPro/aFileChooser
NewQuickAction Android QuickAction
https://github.com/lorensiuswlt/NewQuickAction
android-uitableview Library and example project on how to use the UITableView component
https://github.com/thiagolocatelli/android-uitableview
Android-ProgressFragment Implementation of the fragment with the ability to display indeterminate progress indicator when you are waiting for the initial data.
https://github.com/johnkil/Android-ProgressFragment
android-pdfview A fast PDF reader component for Android development
https://github.com/JoanZapata/android-pdfview
Android-Pdf-Viewer-Library Pdf Viewer library for Android
https://github.com/jblough/Android-Pdf-Viewer-Library
QuiltViewLibrary Android Quilt View Library
https://github.com/jacobmoncur/QuiltViewLibrary
Android-UndoBar An implementation of Android's Undo Bar as seen in Google's Gmail app.
https://github.com/jenzz/Android-UndoBar
Android-ScrollBarPanel Android-ScrollBarPanel allows to attach a View to a scroll indicator like it's done in Path 2.0
https://github.com/rno/Android-ScrollBarPanel
ScrollBarPanelWithClock Path like scrollbar panel with clock.
https://github.com/learnNcode/ScrollBarPanelWithClock
changeloglib Android Library to display your changelog
https://github.com/gabrielemariotti/changeloglib
android-FlipView A small, easy to use android library for implementing flipping between views as seen in the popular Flipboard application
https://github.com/emilsjolander/android-FlipView
discreet-app-rate A lightweight non intrusive app rate reminder for Android
https://github.com/PomepuyN/discreet-app-rate
KenBurnsView Android ImageViews animated by Ken Burns Effect
https://github.com/flavioarfaria/KenBurnsView
UndoBar The UI component for Android advanced UI pattern undo-bar, used in Gmail app, create by roman nurik
https://github.com/soarcn/UndoBar
FancyCoverFlow A cool Open Source CoverFlow view for Android with several fancy effects.
https://github.com/davidschreiber/FancyCoverFlow
AppRater AppRater Library for Android
https://github.com/codechimp-org/AppRater
Android-ActionItemBadge This library offers a simple method to add a small badge icon to your ActionBar-MenuItem
https://github.com/mikepenz/Android-ActionItemBadge
poppyview Android library implementing a poppy view on scroll, similar to the one found in the Google Plus app
https://github.com/flavienlaurent/poppyview
android-segmented-control ios7 UISegmentedControl for android
https://github.com/hoang8f/android-segmented-control
IconicDroid IconicDroid is a custom Android Drawable which allows to draw icons from several iconic fonts.
https://github.com/atermenji/IconicDroid
ParallaxPager Add some depth to your Android scrolling.
https://github.com/prolificinteractive/ParallaxPager
AndroidPinning A standalone library project for certificate pinning on Android.
https://github.com/moxie0/AndroidPinning
WizardPager Wizard Pager is a library that provides an example implementation of a Wizard UI on Android, it's based of Roman Nurik's wizard pager
https://github.com/TechFreak/WizardPager
android-visualizer Takes the input from the Android MediaPlayer and displays visualizations, like in iTunes or WinAmp
https://github.com/felixpalmer/android-visualizer
ExpandablePanel Android library for creating an expandable to full screen view inside a viewgroup composition.
https://github.com/JorgeCastilloPrz/ExpandablePanel
NiftyNotification effects for android notifications.base on (Crouton)
https://github.com/sd6352051/NiftyNotification
GlowPadBackport A backport of the Android 4.2 GlowPadView that works on the SDK on API levels 4+
https://github.com/frakbot/GlowPadBackport
CustomLoading custom loading for android
https://github.com/stormzhang/CustomLoading
chromium_webview Android WebView wrapper based on chromium
https://github.com/mogoweb/chromium_webview
MagicViews Set custom font in Android application
https://github.com/ikocijan/MagicViews
TableFixHeaders Android library that implements a table with fixed headers.
https://github.com/InQBarna/TableFixHeaders
FloatingNotification Floating Notification for Android app - Facebook ChatHeads Notification system
https://github.com/marshallino16/FloatingNotification
android-slideshow-widget A set of widgets to create smooth slideshows with ease.
https://github.com/marvinlabs/android-slideshow-widget
HanselAndGretel Android library providing bread crumbs to the support library fragments.
https://github.com/JakeWharton/HanselAndGretel
ChromaHashView A classic password visualization concept, ported to Android
https://github.com/MichaelEvans/ChromaHashView
Android-DirectoryChooser A directory chooser library for Android.
https://github.com/passy/Android-DirectoryChooser
WheelView An Android Widget for selecting items that rotate on a wheel.
https://github.com/LukeDeighton/WheelView
RippleView View that imitates Ripple Effect on click which was introduced in Android L (for Android 2.3+)
https://github.com/siriscac/RippleView
GaugeView An Android library for drawing gauges on Canvas.
https://github.com/CodeAndMagic/GaugeView
ATableView Create iOS-like tables (UITableView) for Android, using UIKit object model.
https://github.com/dmacosta/ATableView
Android-RecurrencePicker Google Calendar Recurrence picker
https://github.com/Shusshu/Android-RecurrencePicker
ActionSheetForAndroid IOS UIActionSheet in Android
https://github.com/baoyongzhang/ActionSheetForAndroid
ckChangeLog ckChangeLog - An Android Library to display a Change Log
https://github.com/cketti/ckChangeLog
android-floatinglabel-widgets Floating label input widgets
https://github.com/marvinlabs/android-floatinglabel-widgets
MarkdownView MarkdownView is an Android webview with the capablity of loading Markdown text or file and display it as HTML, it uses MarkdownJ and extends Android webview.
https://github.com/falnatsheh/MarkdownView
NoNonsense-FilePicker A file/directory-picker for android. Implemented as a library project.
https://github.com/spacecowboy/NoNonsense-FilePicker
PopoverView A Popover Controller for Android Tablets. It's an easy solution to simulate an iOS UIPopoverController
https://github.com/lupidan/PopoverView
slideuppane A pane that slide up from the bottom of an android view
https://github.com/briangriffey/slideuppane
SwipeBack SwipeBack for Android Activities to do pretty the same as the android "back-button" will do, but in a really intuitive way by using a swipe gesture
https://github.com/sockeqwe/SwipeBack
ShowTipsView Highligth specific points of interest of your app
https://github.com/fredericojssilva/ShowTipsView
FancyCoverFlow A cool Open Source CoverFlow view for Android with several fancy effects.
https://github.com/davidschreiber/FancyCoverFlow
WheelView Android滚动选择控件
https://github.com/wangjiegulu/WheelView
CurtainView An android view,which can layer on any gravity for swiping.
https://github.com/aicaprio/CurtainView
android-pathview Android view with both path from constructed path or from svg.
https://github.com/geftimov/android-pathview
DrawableView A view that allows to paint and saves the result as a bitmap
https://github.com/PaNaVTEC/DrawableView

###</ Template

android-material-drawer-template An Android template with navigation drawer for material design
https://github.com/kanytu/android-material-drawer-template
material-design-icons-adt-template Android Studio / Eclipse ADT template for material-design-icons resources
https://github.com/intrications/material-design-icons-adt-template

###</ Adapter

MultiChoiceAdapter Android - A ListView adapter with support for multiple choice modal selection
https://github.com/ManuelPeinado/MultiChoiceAdapter
easy-adapter Easy Adapters library for Android
https://github.com/ribot/easy-adapter
Renderers Renderers is an Android library that avoids all the boilerplate needed to create a new ListView adapter.
https://github.com/pedrovgs/Renderers
FunDapter Simplify Adapter creation for your Android ListViews.
https://github.com/amigold/FunDapter
instant-adapter Just like instant coffee, saves 78% of your time on Android's Custom Adapters.
https://github.com/ragunathjawahar/instant-adapter
adapter-kit Adapter Kit is a set of useful adapters for Android.
https://github.com/mobsandgeeks/adapter-kit
EfficientAdapter An efficient adapter to make the use of RecyclerView much easier for Android.
https://github.com/StanKocken/EfficientAdapter
EasyListViewAdapters This library provides Easy Android ListView Adapters(EasyListAdapter & EasyCursorAdapter) which makes designing Multi-Row-Type ListView very simple & cleaner, It also provides many useful features for ListView.
https://github.com/birajpatel/EasyListViewAdapters
GridListViewAdapters This library provides GridAdapters(ListGridAdapter & CursorGridAdapter) which enable you to bind your data in grid card fashion within android.widget.ListView, Also provides many other features related to GridListView.
https://github.com/birajpatel/GridListViewAdapters

###</ Validation

android-saripaar UI Validation Library for Android
https://github.com/ragunathjawahar/android-saripaar

###</ Gesture

android-gesture-detectors Gesture detector framework for multitouch handling on Android, based on Android's ScaleGestureDetector
https://github.com/Almeros/android-gesture-detectors

###</ Game Engine

cocos2d-x cocos2d-x for C++
https://github.com/cocos2d/cocos2d-x/
libgdx Desktop/Android/HTML5/iOS Java game development framework
https://github.com/libgdx/libgdx
AndEngine Free Android 2D OpenGL Game Engine
https://github.com/nicolasgramlich/AndEngine
playn A Java game development framework that deploys to JVM, HTML5, Android and iOS.
https://github.com/threerings/playn
LGame This is free 2d game development framework(Java Game Engine), support JavaSE/Android/IOS/WP7/HTML5/PSM/Linux/MAC/Windows.
https://github.com/cping/LGame
LiquidFun LiquidFun is a 2D physics engine for games Developed by GOOGLE
https://github.com/google/liquidfun
jbox2d a 2d Java physics engine, native port of the C++ physics engines Box2D and LiquidFun
https://github.com/jbox2d/jbox2d

###</ Bluetooth

android-beacon-library Allows Android apps to interact with BLE beacons
https://github.com/AltBeacon/android-beacon-library
Android-BluetoothSPPLibrary Bluetooth Serial Port Profile which comfortable to developer application to communication with microcontroller via bluetooth
https://github.com/akexorcist/Android-BluetoothSPPLibrary

###</ SocialNetworks

AndroidSocialNetworks Library for easy work with Facebook, Twitter, LinkedIn and Google on Android
https://github.com/antonkrasov/AndroidSocialNetworks#license

###</ XMPP

asmack A build environment for the XMPP client library Smack on Android
https://github.com/Flowdalic/asmack
Xabber Open source Jabber (XMPP) client with multi-account support, clean and simple interface. Being both free (as in freedom!) and ad-free, Xabber is designed to be the best Jabber client for Android.
https://github.com/redsolution/xabber-android
Conversations Conversations is an open source XMPP (formally known as Jabber) client for Android 4.0+ smart phones.
https://github.com/siacs/Conversations
yaxim YAXIM - Yet Another XMPP Instant Messenger, a jabber client for android
https://github.com/pfleidi/yaxim
androidpn An open source project to provide push notification support for Android -- a xmpp based notification server and a client tool kit.
https://github.com/dannytiehui/androidpn
Android-Paho-Mqtt-Service A simple MQTT Service that will keep running for the duration of your Android application using the Paho Java MQTT Client.
https://github.com/JesseFarebro/Android-Mqtt

###</ Plugin

maven-android-plugin Android Maven Plugin
https://github.com/jayway/maven-android-plugin
android-archetypes Maven Archetypes for Android development
https://github.com/akquinet/android-archetypes
maven-android-sdk-deployer A tool to install components of the Android SDK to use with the Maven Android Plugin.
https://github.com/mosabua/maven-android-sdk-deployer
sdk-manager-plugin Gradle plugin which downloads and manages your Android SDK.
https://github.com/JakeWharton/sdk-manager-plugin
android-holo-colors-idea-plugin IntelliJ / Android Studio plugin for Android Holo Colors
https://github.com/jeromevdl/android-holo-colors-idea-plugin
lein-droid A Leiningen plugin for building Clojure/Android projects
https://github.com/clojure-android/lein-droid
android-selector-chapek Android Studio plugin which automatically generates drawable selectors from appropriately named resources.
https://github.com/inmite/android-selector-chapek
android-parcelable-intellij-plugin IntelliJ Plugin for Android Parcelable boilerplate code generation.
https://github.com/mcharmas/android-parcelable-intellij-plugin
AndroidDynamicLoader A plugin system that runs like a browser, but instead of load web pages, it load plugins which runs natively on Android system.
https://github.com/mmin18/AndroidDynamicLoader
android-sdk-plugin An easy-to-use sbt plugin for working with all Android projects
https://github.com/pfn/android-sdk-plugin
adb-idea A plugin for Android Studio and Intellij IDEA that speeds up your day to day android development.
https://github.com/pbreault/adb-idea
groovy-android-gradle-plugin A Gradle plugin to support the Groovy language for building Android apps
https://github.com/melix/groovy-android-gradle-plugin
apf Android Plugin Framework
https://github.com/umeng/apf
lint-cleaner-plugin A Gradle Plugin for removing unused resources in Android projects.
https://github.com/marcoRS/lint-cleaner-plugin
vim-android Vim plugin to do android development.
https://github.com/bpowell/vim-android
gradle-android-scala-plugin gradle-android-scala-plugin adds scala language support to official gradle android plugin
https://github.com/saturday06/gradle-android-scala-plugin
android-butterknife-zelezny Simple plug-in for Android Studio/IDEA that allows one-click creation of Butterknife view injections.
https://github.com/inmite/android-butterknife-zelezny
m2e-android Android for Maven Eclipse
https://github.com/rgladwell/m2e-android
AndroidProguardScala AndroidProguardScala is an Eclipse plugin that speeds up the development process when you'return using Scala on Android.
https://github.com/banshee/AndroidProguardScala
android-studio-unit-test-plugin Android Studio IDE support for Android gradle unit tests. Prepared for Robolectric.
https://github.com/evant/android-studio-unit-test-plugin

###</ Code Generation

parceler Android Parcelables made easy through code generation.
https://github.com/johncarl81/parceler
auto-parcel Android Parcelable models made easy
https://github.com/frankiesardo/auto-parcel
RoboCoP Pure Java code generation tool for generating a fully functional ContentProvider for Android.
https://github.com/mediarain/RoboCoP
android-contentprovider-generator A small tool to generate an Android ContentProvider.
https://github.com/BoD/android-contentprovider-generator
ParcelablePlease Annotation Processor for generating Parcelable code
https://github.com/sockeqwe/ParcelablePlease
pojobuilder A Java Code Generator for Pojo Builders
https://github.com/mkarneim/pojobuilder
javawriter A utility class which aids in generating Java source files.
https://github.com/square/javawriter

###</ Media

FFmpeg mirror of git://source.ffmpeg.org/ffmpeg.git
https://github.com/FFmpeg/FFmpeg
FFMpeg this is port of ffmpeg for android (this is app, but in future i will do android lib from it and then system will be able to convert videos automatically)
https://github.com/havlenapetr/FFMpeg
libstreaming A solution for streaming H.264, H.263, AMR, AAC using RTP on Android
https://github.com/fyhertz/libstreaming
AndroidFFmpeg FFmpeg build for android random architectures with example jni
https://github.com/appunite/AndroidFFmpeg
android-ffmpeg-java Android Java wrapper around ffmpeg command line binary
https://github.com/guardianproject/android-ffmpeg-java
FFmpeg-Android Script and Instructions for building FFmpeg for Android
https://github.com/OnlyInAmerica/FFmpeg-Android
android-ffmpeg a system for building custom ffmpeg binaries for Android
https://github.com/guardianproject/android-ffmpeg
android-ffmpeg-with-rtmp This repository contains script(s) to build ffmpeg for android with RTMP (and OpenSSL) support.
https://github.com/cine-io/android-ffmpeg-with-rtmp
mp4parser A Java API to read, write and create MP4 files
https://github.com/sannies/mp4parser
jcodec jcodec - a pure java implementation of video/audio codecs.
https://github.com/jcodec/jcodec

###</ Embedded

usb-serial-for-android Android USB host serial driver library for CDC, FTDI, Arduino and other devices.
https://github.com/mik3y/usb-serial-for-android

###</ Utility

smoothie Easy async loading for Android's ListView/GridView
https://github.com/lucasr/smoothie
tape A lightning fast, transactional, file-based FIFO for Android and Java.
https://github.com/square/tape
ColorArt iTunes 11-style color matching code for Android
https://github.com/MichaelEvans/ColorArt
AndroidBillingLibrary Android Market In-app Billing Library https://github.com/robotmedia/AndroidBillingLibrary
android-saripaar UI Validation Library for Android
https://github.com/ragunathjawahar/android-saripaar
timber A logger with a small, extensible API which provides utility on top of Android's normal Log class.
https://github.com/JakeWharton/timber
wire Clean, lightweight protocol buffers for Android.
https://github.com/square/wire
motion An Android library allowing images to exhibit a parallax effect that reacts to the device's tilt
https://github.com/nvanbenschoten/motion
Colours A beautiful set of predefined colors and a set of color methods to make your Android development life easier.
https://github.com/MatthewYork/Colours
Android-Validator Form Validator Library for Android
https://github.com/throrin19/Android-Validator
svg-android Support for scalable vector graphics in Android
https://github.com/pents90/svg-android
davdroid DAVdroid – CalDAV/CardDAV synchronization for Android 4+ devices
https://github.com/rfc2822/davdroid
phrase https://github.com/square/phrase
seismic Android device shake detection.
https://github.com/square/seismic
android-validation-komensky A simple library for validating user input in forms using annotations.
https://github.com/inmite/android-validation-komensky
AndroidFaceCropper Android bitmap Face Cropper
https://github.com/lafosca/AndroidFaceCropper
AutobahnAndroid WebSocket & WAMP in Java for Android
https://github.com/tavendo/AutobahnAndroid
android_dbinspector Android library for viewing in app databases.
https://github.com/infinum/android_dbinspector
wishlist Utilities I wish Android had but doesn't
https://github.com/kevinsawicki/wishlist
joda-time-android Joda-Time library with Android specialization
https://github.com/dlew/joda-time-android
OpenKeychain OpenKeychain is an OpenPGP implementation for Android.
https://github.com/open-keychain/open-keychain
Silk A library containing a large set of utilities and views for Android apps.
https://github.com/afollestad/Silk
Reservoir Android library to easily serialize and cache your objects to disk using key/value pairs.
https://github.com/anupcowkur/Reservoir
Android-Templates-And-Utilities Collection of source codes, utilities, templates and snippets for Android development.
https://github.com/petrnohejl/Android-Templates-And-Utilities
groundy Sexy way to execute async/background tasks on Android
https://github.com/telly/groundy
EasyCamera Wrapper around the android Camera class that simplifies its usage
https://github.com/Glamdring/EasyCamera
CastCompanionLibrary-android CastCompanionLibrary-android is a library project to enable developers integrate Cast capabilities into their applications faster and easier.
https://github.com/googlecast/CastCompanionLibrary-android
cling UPnP/DLNA library for Java and Android
https://github.com/4thline/cling
dspec A simple way to define and render UI specs on top of your Android UI.
https://github.com/lucasr/dspec
GhostLog Android app that displays the logcat buffer in a system overlay window
https://github.com/jgilfelt/GhostLog
secure-preferences Android Shared preference wrapper than encrypts the keys and values of Shared Preferences. It's not bullet proof security but rather a quick win for incrementally making your android app more secure.
https://github.com/scottyab/secure-preferences
DebugLog Create a simple and more understandable Android logs.
https://github.com/MustafaFerhan/DebugLog
AndroidCaldavSyncAdapater Caldav synch adapter for Android
https://github.com/gggard/AndroidCaldavSyncAdapater
routable-android Routable, an in-app native URL router, for Android
https://github.com/clayallsopp/routable-android
fb-android-dagger A set of helper classes for using dagger with Android components such as Applications, Activities, Fragments, BroadcastReceivers, and Services.
https://github.com/adennie/fb-android-dagger
android-gesture-detectors Gesture detector framework for multitouch handling on Android, based on Android's ScaleGestureDetector
https://github.com/Almeros/android-gesture-detectors
TypedPreferences Preference wrappers for primitive types for Android
https://github.com/johnjohndoe/TypedPreferences
android-intents A collection of well-known Android intents for most common actions
[https://github.com/d-tarasov/android-intents])(https://github.com/d-tarasov/android-intents)
android-intents A small library which will save you from writing the same intent creation code again and again for the most simple tasks
https://github.com/marvinlabs/android-intents
AndroidUtils AndroidUtils
https://github.com/pardom/AndroidUtils
ASimpleCache a simple cache for android and java
https://github.com/yangfuhai/ASimpleCache
svg-android Fork of svg-android +SVN history +Maven +more
https://github.com/japgolly/svg-android
AndroidQuickUtils Android QuickUtils is a development library for the Android platform. It is intended to make application development easier and consistent throughout your applications.
https://github.com/cesarferreira/AndroidQuickUtils
esperandro Easy SharedPreference Engine foR ANDROid
https://github.com/dkunzler/esperandro
AndroidCommons Various useful utilities for Android apps development
https://github.com/alexvasilkov/AndroidCommons
greenrobot-common General purpose utilities and hash functions for Android and Java (aka java-common)
https://github.com/greenrobot/greenrobot-common
puree-android Puree is a log collector for Android.
https://github.com/cookpad/puree-android

###</ SDK

mapbox-android-sdk Open Source Maps SDK for Android
https://github.com/mapbox/mapbox-android-sdk
android-checkout Library for Android In-App Billing (Version 3)
https://github.com/serso/android-checkout
WeatherLib Android Weather Library: android weather lib to develop weather based app fast and easily
https://github.com/survivingwithandroid/WeatherLib
Clusterkraf A clustering library for the Google Maps Android API v2.
https://github.com/twotoasters/clusterkraf
aws-sdk-android Official mirror of the AWS SDK for Android.
https://github.com/aws/aws-sdk-android
evernote-sdk-android Evernote SDK for Android
https://github.com/evernote/evernote-sdk-android
countly-sdk-android Countly Mobile Analytics - Android SDK
https://github.com/Countly/countly-sdk-android
ANE-Facebook Air Native Extension (iOS and Android) for the Facebook mobile SDK
https://github.com/freshplanet/ANE-Facebook
Office-365-SDK-for-Android Office 365 SDK for Android Preview by Microsoft Open Technologies, Inc.
https://github.com/OfficeDev/Office-365-SDK-for-Android
weibo_android_sdk 新浪微博 Android SDK
https://github.com/sinaweibosdk/weibo_android_sdk
socialauth-android SocialAuth repository which contains socialauth android version and samples
https://github.com/3pillarlabs/socialauth-android
PayPal-Android-SDK Accept PayPal and credit cards in your Android app
https://github.com/paypal/PayPal-Android-SDK
barcodescanner Barcode Scanner Libraries for Android
https://github.com/dm77/barcodescanner
android-donations-lib Donations Library for Android. Supports Google Play Store, Flattr, PayPal, and Bitcoin
https://github.com/dschuermann/android-donations-lib
card.io-Android-SDK card.io provides fast, easy credit card scanning in mobile apps
https://github.com/card-io/card.io-Android-SDK
Android-ShareEverywhere This project is the tribute to my favorite Android Widget: the Share button. Share ALL THE THINGS!
https://github.com/dgmltn/Android-ShareEverywhere
android-simpl3r Amazon S3 multipart file upload for Android, made simple
https://github.com/jgilfelt/android-simpl3r
poly-picker Android library project for providing multiple image selection from the device.
https://github.com/jaydeepw/poly-picker
Android-ReactiveLocation Small library that wraps Google Play Service API in brilliant RxJava Observables reducing boilerplate to minimum.
https://github.com/mcharmas/Android-ReactiveLocation
LandscapeVideoCamera Powerful custom Android Camera with granular control over the video quality and filesize, restricting recordings to landscape only.
https://github.com/jmolsmobile/LandscapeVideoCamera

###</ Test

Junit A programmer-oriented testing framework for Java.
https://github.com/junit-team/junit
robotium Like Selenium, but for Android
https://github.com/RobotiumTech/robotium
assertj-android A set of AssertJ helpers geared toward testing Android.
https://github.com/square/assertj-android
selendroid "Selenium for Android" (Test automate native or hybrid Android apps and the mobile web with Selendroid.)
https://github.com/selendroid/selendroid
Cafe A powerful test framework for Android named Case Automated Framework for Everyone.
https://github.com/BaiduQA/Cafe
android-junit-report A custom instrumentation test runner for Android that generates XML reports for integration with other tools.
https://github.com/jsankey/android-junit-report
robolectric Android Unit Testing Framework
https://github.com/xtremelabs/robolectric

###</ Chart

GraphView Android Graph Library for creating zoomable and scrollable line and bar graphs.
https://github.com/jjoe64/GraphView
MPAndroidChart A simple Android chart view / graph view library, supporting line- bar- pie- and candlestick charts as well as scaling, dragging and animations.
https://github.com/PhilJay/MPAndroidChart
EazeGraph An Android chart and graph library
https://github.com/blackfizz/EazeGraph
AndroidCharts An easy-to-use Android charts library with animation.
https://github.com/HackPlan/AndroidCharts
WilliamChart Android library to create charts.
https://github.com/diogobernardino/WilliamChart
Android-Charts Open-source native Android graph/chart framework includes line chart,stick chart,candlestick chart,pie chart,spider-web chart etc.
https://github.com/limccn/Android-Charts
XCL-Charts Android开源图表库(XCL-Charts is a free charting library for Android platform.)
https://github.com/xcltapestry/XCL-Charts
desCharts Android Charting Library
https://github.com/bradipao/desCharts
HelloCharts Charts/graphs library for Android compatible with API 8+
https://github.com/lecho/hellocharts-android
HoloGraphLibrary Fork of the HoloGraphLibrary by Daniel Nadeau with additionnal features
https://github.com/Androguide/HoloGraphLibrary

###</ Icons

Skycons Forecast / DarkSky's Skycons, Animated Weather icons recreated for Android
https://github.com/torryharris/Skycons
droidicon Over 1600 customizable icons for Android including 750+ Google Material Design icons, 25 ready-made social badges, and more!
https://github.com/theDazzler/droidicon
Android-Iconics Android-Iconics is a library to use (almost) any alternative iconfont in your projects. It allows you to add any Android-Iconics compatible typeface-library-addon to your project and you are able to start using that font.
https://github.com/mikepenz/Android-Iconics
android-material-icons Easy to use material icons for Android
https://github.com/Malinskiy/android-material-icons
androidicons Androidicons is a professional, handcrafted icon set with 250 icons in 14 different colors and 5 sizes, including an icon font and all sources.
https://github.com/opoloo/androidicons

###</ Colors

Android-Material-Design-Colors Android Material Design Colors
https://github.com/wada811/Android-Material-Design-Colors

###</ Font

Calligraphy Custom fonts in Android the easy way...
https://github.com/chrisjenx/Calligraphy
android-typeface-helper Typeface helper for Android
https://github.com/norbsoft/android-typeface-helper
Android-Icon-Fonts Material and Holo iconic fonts.
https://github.com/johnkil/Android-Icon-Fonts
Print A lightweight Android library for use iconic fonts.
https://github.com/johnkil/Print/
TypefaceHelper Helper object for injecting typeface into various text views of android.
https://github.com/Drivemode/TypefaceHelper

###</ OpenGL

Rajawali Rajawali is a 3D engine for Android based on OpenGL ES 2.0/3.0. It can be used for normal apps as well as live wallpapers.
https://github.com/MasDennis/Rajawali

###</ Debug

android-grid-wichterle This app will show grid overlay over whole system which helps you to verify your excellent app design.
https://github.com/inmite/android-grid-wichterle

###</ Demo

android-demos Examples of Android applications
https://github.com/novoda/android-demos
u2020 A sample Android app which showcases advanced usage of Dagger among other open source libraries.
https://github.com/JakeWharton/u2020
BlurEffectForAndroidDesign Sample to show how to implement blur graphical tricks
https://github.com/PomepuyN/BlurEffectForAndroidDesign
maven-android-plugin-samples Usage examples for Android Maven Plugin
https://github.com/jayway/maven-android-plugin-samples
Android-WizardPager Android pager-style wizard flow sample code
https://github.com/romannurik/Android-WizardPager
AndroidPushNotificationsDemo A example of an android app that receives push notifications using MQTT.
https://github.com/tokudu/AndroidPushNotificationsDemo
android-basic-samples Google Play game services - Android samples
https://github.com/playgameservices/android-basic-samples
RobolectricSample Sample project demonstrating use of the Robolectric Android testing project
https://github.com/robolectric/RobolectricSample
android-demo Android common lib demo, include ImageCache, HttpCache, DropDownListView, DownloadManager, install apk silent and so on, you can find description
https://github.com/Trinea/android-demo
android-movies-demo Sample application demonstrating Android design and animation
https://github.com/dlew/android-movies-demo
maven-android-plugin-samples Usage examples for Android Maven Plugin
https://github.com/jayway/maven-android-plugin-samples
android-http-examples Sample code for HTTP on Android.
https://github.com/swankjesse/android-http-examples
androidmvp MVP Android Example
https://github.com/antoniolg/androidmvp
ProgrammingAndroidExamples This repo contains example code for O'Reilly's "Programming Android" by Zigured Mednieks, Laird Dornin, Blake Meike and Masumi Nakamura
https://github.com/bmeike/ProgrammingAndroidExamples
android-layout-samples Explorations around Android custom layouts
https://github.com/lucasr/android-layout-samples
LearningAndroidYamba This is the code that goes along with Learning Android book.
https://github.com/twitter-university/LearningAndroidYamba
RoboDemo RoboDemo is a ShowCase library for Android to demonstrate to users how a given Activity works.
https://github.com/stephanenicolas/RoboDemo
ProgrammingAndroid2Examples This repo contains example code for O'Reilly's "Programming Android" by Zigured Mednieks, Laird Dornin, Blake Meike and Masumi Nakamura
https://github.com/bmeike/ProgrammingAndroid2Examples
hellomap-android Quick start with the Google Maps Android API
https://github.com/googlemaps/hellomap-android
GraphView-Demos Examples for my Android GraphView library
https://github.com/jjoe64/GraphView-Demos
Android-Volley-Example Android volley library examples
https://github.com/PareshMayani/Android-Volley-Example
android-demos Google Drive Android API Demos
https://github.com/googledrive/android-demos
AndroidDemoProjects Collection of Small Android Projects
https://github.com/PaulTR/AndroidDemoProjects
android-ActivitySceneTransition Demonstrates how to the use Activity scene transitions when transitions from one Activity to another. Uses a combination of moveImage and changeBounds to nicely transition a grid of images to an Activity with a large image and detail text.
https://github.com/googlesamples/android-ActivitySceneTransition
android_L_preview_example This project is focused on the sample using the API's new preview version of Android-L, use of transitions, shadows etc... https://github.com/saulmm/android_L_preview_example
googletv-android-samples Source for many GoogleTV Example applications.
https://github.com/google/googletv-android-samples
Android-RxJava Learning RxJava for Android by example
https://github.com/kaushikgopal/Android-RxJava
Android-LollipopShowcase A simple app to showcase some of the cool new cool stuff in Android L. RecyclerView, CardView, ActionBarDrawerToggle, DrawerLayout, Animations, Android Compat Design, Toolbar
https://github.com/mikepenz/Android-LollipopShowcase
QuickNews This is a news client, similar to netease, news headlines
https://github.com/tigerguixh/QuickNews
android-best-practices Do's and Don'ts for Android development, by Futurice developers
https://github.com/futurice/android-best-practices
ToolbarMenudrawer Quick example for the new Toolbar (and Menudrawer) API. Thanks for starring / forking me. :')
https://github.com/I-am-Reinvented/ToolbarMenudrawer
Android-PullLayout 仿UC天气下拉和微信下拉眼睛
https://github.com/BlueMor/Android-PullLayout
DragLayout An Android Project.ViewDragHelper.QQ.QQ5.0.侧滑
https://github.com/BlueMor/DragLayout
rx-android-architecture An example project of an Android architecture built on RxJava
https://github.com/tehmou/rx-android-architecture
AndroidCoolDragAndDropGridView An example of a gridview with various column span items and drag and drop support like Google keep has
https://github.com/theredsunrise/AndroidCoolDragAndDropGridView
Demo-GoogleBook-Android An android demo about searching and displaying books details using Google book api.
https://github.com/Jungerr/Demo-GoogleBook-Android
Demo-YouTuBe-Android An android demo about searching and playing youtube videos with youtube player or videoview.
https://github.com/Jungerr/Demo-YouTuBe-Android
android-proguard-snippets Proguard configurations for common Android libraries
https://github.com/krschultz/android-proguard-snippets
ViewPagerHeaderScrollDemo ViewPagerHeaderScrollDemo
https://github.com/ongakuer/ViewPagerHeaderScrollDemo
Quality-Tools-for-Android This is an Android sample app + tests that will be used to work on various project to increase the quality of the Android platform.
https://github.com/stephanenicolas/Quality-Tools-for-Android
socket.io-android-chat A simple chat demo for socket.io and Android
https://github.com/nkzawa/socket.io-android-chat
AndroidTVExplorer A sample project which can be used as a base in order to develop Media Library applications for Android TV. Follow the series of blogs starting at http://www.malmstein.com/blog/2014/10/21/building-applications-for-android-tv/ in order to keep up to date with the process
https://github.com/malmstein/AndroidTVExplorer
Android-Notification-Example A simple sample showing the different types of notifications on Andoid
https://github.com/saulmm/Android-Notification-Example
androidmvp MVP Android Example used to explain how to use this pattern in our Android apps. This code was created to support an article explanation.
https://github.com/antoniolg/androidmvp

###</ App

2048-android The android port of the 2048 game (for offline playing)
https://github.com/uberspot/2048-android
FeedEx FeedEx News Reader is a light and modern Android feed reader, based on Sparse rss.
https://github.com/HoloAddict/FeedEx
rubychina4android Ruby-China的Android客户端
https://github.com/gonjay/rubychina4android
HackerNews An open source Hacker News client for Android.
https://github.com/bishopmatthew/HackerNews
News-Android-App ownCloud News Reader - Android App
https://github.com/owncloud/News-Android-App
android-delicious Delicious Android is an Android app which helps you access and save bookmarks via Delicious. It's available over at Google Play.
https://github.com/lexs/android-delicious
droidplanner Ground Control Station for Android Devices
https://github.com/DroidPlanner/droidplanner
FoldingNavigationDrawer-Android This is a sample project present how to use Folding-Android to add Folding Efect to Navigation Drawer.
https://github.com/tibi1712/FoldingNavigationDrawer-Android
play-android Stream music and control the queue of a play server from your Android device.
https://github.com/play/play-android
vanilla Vanilla Music Player for Android (abandoned)
https://github.com/kreed/vanilla
OpenFlappyBird An open source clone of a famous flappy bird game for Android using AndEngine
https://github.com/deano2390/OpenFlappyBird
TurtlePlayer A Free, Fully Fledged, Open-Source Music Player for Android
https://github.com/eddturtle/TurtlePlayer
seadroid Android client for Seafile
https://github.com/haiwen/seadroid
freegemas-gdx Freegemas libGDX is an Android and Java desktop port of Freegemas, which in turn is an open source version of the well known Bejeweled.
https://github.com/siondream/freegemas-gdx
kanxue-android-app 看雪安全论坛 Android 客户端
https://github.com/kanxue-team/kanxue-android-app
FlappyCow Android game in "Flappy Bird" Style
https://github.com/cubei/FlappyCow 1.wakao-app 哇靠百科－一款聚合了众多笑话段子、妹子图、微信公众号文章的Android App。
https://github.com/yongbo000/wakao-app
Twidere-Android Twidere is a powerful twitter client for Android 1.6+ 1 , which gives you a full Holo experience and nearly full Twitter's feature.
https://github.com/TwidereProject/Twidere-Android
Telecine Record full-resolution video on your Android devices.
https://github.com/JakeWharton/Telecine
TopNews 高仿“今日头条”客户端，实现它大部分的功能，练习之作，目的了解怎么发开一个新闻类客户端，从涉及的相关知识点中提升自我水平。
https://github.com/Rano1/TopNews
WaniKani-for-Android An Android client application for the awesome kanji learning website wanikani.com
https://github.com/xiprox/WaniKani-for-Android
OpenLibra-Material OpenLibra client on Material Design
https://github.com/saulmm/OpenLibra-Material

###</ Security

gnupg-for-android A port of gnupg to Android
https://github.com/guardianproject/gnupg-for-android
openssl-android a version of the official Android openssl setup to build standalone for use in app
https://github.com/guardianproject/openssl-android
apg OpenPGP for Android
https://github.com/thialfihar/apg
android-grid-wichterle This app will show grid overlay over whole system which helps you to verify your excellent app design.
https://github.com/inmite/android-grid-wichterle

###</ Tools

scrollscreenshot Make Android screenshots of scrollable screen content
https://github.com/PGSSoft/scrollscreenshot
dex-method-counts Command-line tool to count per-package methods in Android .dex files
https://github.com/mihaip/dex-method-counts
osmtracker-android GPS tracking tool for OpenStreetMap
https://github.com/nguillaumin/osmtracker-android
ProMosaic Make mosaic effect on android
https://github.com/coderkiss/ProMosaic
enroscar A set of Android tools that facilitate apps development
https://github.com/stanfy/enroscar
android-device-frame-generator Wrap your app screenshots in real device artwork
http://f2prateek.com/android-device-frame-generator/
AndroidGradleStarter Android Gradle Starter
https://github.com/ravidsrk/AndroidGradleStarter
android-gradle-template Combines Android Studio, Gradle, Espresso, Robolectric, AndroidAnnotations, RoboCoP, JaCoCo
https://github.com/nenick/android-gradle-template
swiftp FTP server for your android device.
https://github.com/ppareit/swiftp
NotificationLog Use an expanded notification as a makeshift Android log output console.
https://github.com/jgilfelt/NotificationLog
Java7-on-Android Java 7 features backported to Android 2.2+
https://github.com/yareally/Java7-on-Android
Genius-Android 一个在Android中能经常使用的库集合，包括日志，命令行语句执行；Ping,DNS,Telnet,TraceRoute等网络包；同时包含一套UI主题。
https://github.com/qiujuer/Genius-Android
TaggerString TaggerString is very light library which allows to build dynamic string resource in much more readable way.
https://github.com/polok/TaggerString
svg2android SVG to Android VectorDrawable XML resource file
https://github.com/inloop/svg2android
gplay.ws create a badge to promote your own Android application in a single step
http://gplay.ws/
gradle-play-publisher Gradle Plugin to upload your APK and metadata to the Google Play Store
https://github.com/Triple-T/gradle-play-publisher
android-lifecycle A diagram of the Android Activity / Fragment lifecycle
[https://github.com/xxv/android-lifecycle][https://github.com/xxv/android-lifecycle]
AndroidDevTools 收集整理Android开发所需的Android SDK、开发中用到的工具、Android开发教程、Android设计规范，免费的设计素材等。
https://github.com/inferjay/AndroidDevTools
gradle-packer-plugin Android Packer Gradle Plugin
https://github.com/mcxiaoke/gradle-packer-plugin
AndroidLocalizationer This is a Android Studio/ IntelliJ IDEA plugin to localize your Android app, translate your string resources automactically.
https://github.com/westlinkin/AndroidLocalizationer

###</ Decompiler

jadx Dex to Java decompiler
https://github.com/skylot/jadx
simplify Generic Android Deobfuscator
https://github.com/CalebFenton/simplify

###</ Gradle plugin

android-native-dependencies Gradle plugin for resolving and downloading Android native dependencies (.so)
https://github.com/nhachicha/android-native-dependencies

###</ Android Wear

BusWear EventBus for Android Wear devices.
https://github.com/tajchert/BusWear

###</ Other

DiskLruCache Java implementation of a Disk-based LRU cache which specifically targets Android compatibility.
https://github.com/JakeWharton/DiskLruCache
anode Android framework for node.js applications
https://github.com/paddybyers/anode
Fragment-Switcher An instance-state saving fragment switcher, intended for use with navigation drawers or tabs.
https://github.com/jacobtabak/Fragment-Switcher

CreatorB/Android-Library

Linked List of Useful Libraries

List Menu(#list-menu)

1. Personalized Views

1. ListView

2. ActionBar

3. Menu

4. ViewPager Gallery

5. GridView

6. ImageView

7. ProgressBar

8. TextView

9. Others

2. Common Util Libs

1. Dependency Injection

2. Image Cache

3. Network

4. Database

5. Android common lib

6. Android Compatible low version

7. Multimedia

8. Event Bus

9. Sensor

10. Security

11. Others

3. Excellent projects

4: Development and testing tools

1. Development productivity tools

2. Develop self-test related

3. Testing tools

4. Development and build environment

5. Others

4. Outstanding individuals and groups

1. Individual

2. Group

News:

Tutorials:

Architecture:

ORM:

Design:

Dependency Injection:

Networking:

UI:

Testing:

Tools:

Hungry for more?

Libraries

UI

Widgets

TextView

Button

EditText

ImageView

ProgressBar

ListView

ViewPager

SeekBar

GridView

ScrollView

ActionBar

Sliding Views

Other

Dialogs & Pickers

Toasts