@Override
        public void onPanelStateChanged(View panel, PanelState previousState, PanelState newState) {
        }
No-op stubs for {@link PanelSlideListener}. If you only want to implement a subset
of the listener methods you can extend this instead of implement the full interface.
app/src/main/java/home/smart/fly/animations/widget/slidepanel/SlidingUpPanelLayout.java