ShimmerRecyclerView

ShimmerRecyclerView is an custom RecyclerView library based on Facebook's Shimmer effect for Android library and inspired from Sharish's ShimmerRecyclerView.

There is reason behind creating a separate library for ShimmerRecyclerView, most of libraries doesn't not support runtime switching of LayoutManager or shimmer layout resources. Secondly the other similar library is build upon Supercharge's ShimmerLayout which is I feel very less active in terms of release. So I came up with an alternative.

Demo

Change layout manager in runtime LinearLayoutManager to GridLayoutManager and Shimmer will adopt accordingly. Setup mShimmerRecyclerView.setItemViewType(ShimmerAdapter.ItemViewType) to change view type of Shimmer adapter.

Switching Layouts	Multiple Type Demo	Grid Demo

Download

To include ShimmerRecyclerView in your project, add the following to your dependencies:

app/build.gradle

dependencies {
   implementation 'com.facebook.shimmer:shimmer:0.4.0'
   implementation 'com.todkars:shimmer-recyclerview:0.4.0'
}

Usage

The following snippet shows how you can use Shimmer RecyclerView in your project.

Layout

<com.todkars.shimmer.ShimmerRecyclerView
    android:id="@+id/shimmer_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
    app:shimmer_recycler_layout="@layout/list_item_shimmer_layout"
    app:shimmer_recycler_item_count="10" />

Activity

public class MainActivity extends Activity {
    
    private ShimmerRecyclerView mShimmerRecyclerView;
    
    //... other variables
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        mShimmerRecyclerView = findViewById(R.id.shimmer_recycler_view);
        
        mShimmerRecyclerView.setLayoutManager(new LinearLayoutManager(this),
            R.layout.list_item_shimmer_layout);
        
        mShimmerRecyclerView.setAdapter(adapter);
        
        // This is optional, use if no attributes are mentioned in layout xml resource.
        // WARNING: Setting Shimmer programmatically will obsolete all shimmer attributes.
        /* mShimmerRecyclerView.setShimmer(mShimmer); */
        
        /* Shimmer layout view type depending on List / Gird */
        mShimmerRecyclerView.setItemViewType((type, position) -> {
            switch (type) {
                case ShimmerRecyclerView.LAYOUT_GRID:
                    return position % 2 == 0
                            ? R.layout.list_item_shimmer_grid
                            : R.layout.list_item_shimmer_grid_alternate;

                default:
                case ShimmerRecyclerView.LAYOUT_LIST:
                    return position == 0 || position % 2 == 0
                            ? R.layout.list_item_shimmer
                            : R.layout.list_item_shimmer_alternate;
            }
        });
        
        mShimmerRecyclerView.showShimmer();     // to start showing shimmer
        
        // To stimulate long running work using android.os.Handler
        mHandler.postDelayed((Runnable) () -> {
            mShimmerRecyclerView.hideShimmer(); // to hide shimmer
        }, 3000);
    }
}

Attributes

Most of the attributes used for ShimmerRecyclerView are same as Facebook's ShimmerFrameLayout below is detail table:

Name	Attribute	Description
Shimmer Layout	shimmer_recycler_layout	Layout reference used for as shimmer base.
Shimmer Item Count	shimmer_recycler_item_count	Number of shimmers to be shown in list, default is 9.
Clip to Children	`shimmer_recycler_clip_to_children`	Whether to clip the shimmering effect to the children, or to opaquely draw the shimmer on top of the children. Use this if your overall layout contains transparency.
Colored	`shimmer_recycler_colored`	Whether you want the shimmer to affect just the alpha or draw colors on-top of the children.
Base Color	`shimmer_recycler_base_color`	If colored is specified, the base color of the content.
Highlight Color	`shimmer_recycler_highlight_color`	If colored is specified, the shimmer's highlight color.
Base Alpha	`shimmer_recycler_base_alpha`	If colored is not specified, the alpha used to render the base view i.e. the unhighlighted view over which the highlight is drawn.
Highlight Alpha	`shimmer_recycler_highlight_alpha`	If colored is not specified, the alpha of the shimmer highlight.
Auto Start	`shimmer_recycler_auto_start`	Whether to automatically start the animation when the view is shown, or not.
Duration	`shimmer_recycler_duration`	Time it takes for the highlight to move from one end of the layout to the other.
Repeat Count	`shimmer_recycler_repeat_count`	Number of times of the current animation will repeat.
Repeat Delay	`shimmer_recycler_repeat_delay`	Delay after which the current animation will repeat.
Repeat Mode	`shimmer_recycler_repeat_mode`	What the animation should do after reaching the end, either restart from the beginning or reverse back towards it.
Direction	`shimmer_recycler_direction`	The travel direction of the shimmer highlight: left to right, top to bottom, right to left or bottom to top.
Dropoff	`shimmer_recycler_dropoff`	Controls the size of the fading edge of the highlight.
Intensity	`shimmer_recycler_intensity`	Controls the brightness of the highlight at the center
Shape	`shimmer_recycler_shape`	Shape of the highlight mask, either with a linear or a circular gradient.
Tilt	`shimmer_recycler_tilt`	Angle at which the highlight is tilted, measured in degrees.
Fixed Width or Height	`shimmer_recycler_fixed_width` or `shimmer_recycler_fixed_height`	Fixed sized highlight mask, if set, overrides the relative size value.
Width or Height Ratio	`shimmer_recycler_width_ratio` or `shimmer_recycler_height_ratio`	Size of the highlight mask, relative to the layout it is applied to.

LICENSE

    ShimmerRecyclerView a custom RecyclerView library
    Copyright (C) 2019  Omkar Todkar <omtodkar@gmail.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see https://www.gnu.org/licenses/gpl.txt

Facebook Shimmer is published under BSD License