CustomViewGroup.java

public class CustomViewGroup extends FrameLayout {


  @Override
    public boolean dispatchKeyEventPreIme(KeyEvent event) {
        Timber.d("");
        if(event != null){
            int keyCode = event.getKeyCode();
            if(keyCode == KeyEvent.KEYCODE_BACK){
                // hide search suggestions UI
            }
        }

        return true;
    }
}