RecyclerView + Toolbar Elevation | Android View Of The Week #2
Learn how to show an elevation on Android AppBarLayout when a RecyclerView scrolls upward.
First make sure you include RecyclerView and AppBarLayout in your root layout . Then call the add on scroll listener method of your RecyclerView. In the on scrolled method show elevation on the AppBarLayout once the RecyclerView scrolls in an upward direction.