title: Drop shadow on all views exept one
body: <p><a href="https://i.stack.imgur.com/GeOUP.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GeOUP.jpg" alt="enter image description here" /></a></p>
  <p>I want to implement such a feature: when one RecyclerView item is clicked, a shadow drops on all other items.
  How can I do this?</p>