how to show/hide FAB on scroll Recycler view with coordinator parent

Question

I have an activity with coordinator layout.inside activity there is a fragment with Recycler view and float button.how can I show/hide float button when Scroll Recycler view and

Answer 1

I modified Leondro's method such that the FAB will hide when there's scrolling and show when the scrolling stops.

scrollListener = new RecyclerView.OnScrollListener() {  
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        switch (newState) {
            case RecyclerView.SCROLL_STATE_IDLE:
                fab.show();
                break;
            default:
                fab.hide();
                break;
        }
        super.onScrollStateChanged(recyclerView, newState);
    }
}; 

rv.clearOnScrollListeners();
rv.addOnScrollListener(scrollListener);