Android Google+ like floating action button which reacts on the list view scrolling events. Becomes visible when the list view is scrolled up and invisible when scrolled down.
1) Add as a dependency to your build.gradle
:
dependencies {
compile 'com.melnykov:floatingactionbutton:1.0.7'
}
2) Add the com.melnykov.fab.FloatingActionButton
to your layout XML file. The button should be placed in the bottom right corner of the screen. The width and height of the floating action button are hardcoded to 56dp for the normal and 40dp for the mini button as specified in the guidlines.
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:fab="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.melnykov.fab.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="16dp"
android:src="@drawable/ic_action_content_new"
fab:fab_colorNormal="@color/primary"
fab:fab_colorPressed="@color/primary_pressed"
fab:fab_colorRipple="@color/ripple" />
</FrameLayout>
3) Attach the ListView
, GridView
or RecyclerView
(currently only the LinearLayoutManager
is supported) to the button in the Java code:
ListView listView = (ListView) findViewById(android.R.id.list);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.attachToListView(listView);
FloatingActionButton
extends android.widget.ImageButton
so it has all methods the latter has.
If you need custom code to be executed when scrolling events occur, extend FloatingActionButton.FabOnScrollListener
or FloatingActionButton.FabRecyclerOnViewScrollListener
and override FabOnScrollListener.onScrollDown()
/ FabOnScrollListener.onScrollUp()
. Then pass an instance of a custom listener as a second argument to attachToListView
/attachToRecyclerView
.
Do not forget to call super.onScrollDown()
and super.onScrollUp()
in overriden methods. If you do not, the FAB will not react to scrolling events.
4) Add the namespace xmlns:fab="http://schemas.android.com/apk/res-auto"
to your layout file.
-
Set the button type (normal or mini) via the
fab_type
xml attribute (default is normal):fab:fab_type="mini"
or
fab.setType(FloatingActionButton.TYPE_MINI);
-
Set the normal and pressed colors via the xml attributes:
fab:fab_colorNormal="@color/primary" fab:fab_colorPressed="@color/primary_pressed"
or
fab.setColorNormal(getResources().getColor(R.color.primary)); fab.setColorPressed(getResources().getColor(R.color.primary_pressed));
-
Enable/disable the button shadow with the
fab_shadow
xml attribite (it's enabled by default):fab:fab_shadow="false"
or
fab.setShadow(false);
-
Show/hide the button expliciltly:
fab.show(); fab.hide(); fab.show(false); // Show without an animation fab.hide(false); // Hide without an animation
-
Specify the ripple color for API 21+:
fab:fab_colorRipple="@color/ripple"
or
fab.setColorRipple(getResources().getColor(R.color.ripple));
5) Set an icon for the FloatingActionButton
using android:src
xml attribute. Use drawables of size 24dp as specified by guidlines. Icons of desired size can be generated with Android Asset Studio.
Version 1.0.7:
- Updated shadow assets to better match material design guidlines;
- Make
FabOnScrollListener
andFabRecyclerOnViewScrollListener
implementScrollDirectionListener
for easier custom listeners usage.
Version 1.0.6:
- Added support for the
RecyclerView
; - Added ripple effect and elevation for API level 21.
Thanks to Aidan Follestad.
Version 1.0.5:
- Updated shadow to more accurately match the material design spec;
Version 1.0.4:
- Allow a custom
OnScrollListeners
to be attached to a list view; - Work properly with list of different height rows;
- Ignore tiny shakes of fingers.
Version 1.0.3:
- Add methods to show/hide without animation;
- Fix show/hide when a view is not measured yet.
Please ping me if you would like to be added here.
Icon | Application |
---|---|
Finger Gesture Launcher |
Country flag icons used in the sample are taken from www.icondrawer.com
The MIT License (MIT)
Copyright (c) 2014 Oleksandr Melnykov
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