-keep class io.codetail.animation.arcanimator.** { *; }

import android.support.design.widget.FloatingActionButton;

public class Fab extends FloatingActionButton implements AnimatedFab {

   /**
    * Shows the FAB.
    */
    @Override
    public void show() {
        show(0, 0);
    }

    /**
     * Shows the FAB and sets the FAB's translation.
     *
     * @param translationX translation X value
     * @param translationY translation Y value
     */
    @Override
    public void show(float translationX, float translationY) {
        // NOTE: Using the parameters is only needed if you want
        // to support moving the FAB around the screen.
        // NOTE: This immediately hides the FAB. An animation can 
        // be used instead - see the sample app.
        setVisibility(View.VISIBLE);
    }

    /**
     * Hides the FAB.
     */
    @Override
    public void hide() {
        // NOTE: This immediately hides the FAB. An animation can
        // be used instead - see the sample app.
        setVisibility(View.INVISIBLE);
    }
}

public class MaterialSheetFabActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Fab fab = (Fab) findViewById(R.id.fab);
        View sheetView = findViewById(R.id.fab_sheet);
        View overlay = findViewById(R.id.dim_overlay);
        int sheetColor = getResources().getColor(R.color.fab_sheet_color);
        int fabColor = getResources().getColor(R.color.fab_color);

        // Initialize material sheet FAB
        materialSheetFab = new MaterialSheetFab<>(fab, sheetView, overlay,
            sheetColor, fabColor);
    }
}

@Override
public void onBackPressed() {
    if (materialSheetFab.isSheetVisible()) {
        materialSheetFab.hideSheet();
    } else {
        super.onBackPressed();
    }
}

materialSheetFab.setEventListener(new MaterialSheetFabEventListener() {
    @Override
    public void onShowSheet() {
        // Called when the material sheet's "show" animation starts.
    }
    
    @Override
    public void onSheetShown() {
        // Called when the material sheet's "show" animation ends.
    }

    @Override
    public void onHideSheet() {
        // Called when the material sheet's "hide" animation starts.
    }
     
    public void onSheetHidden() {
        // Called when the material sheet's "hide" animation ends.
    }
});

materialSheetFab.showFab(translationX, translationY);