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);
    }
}