title: RecyclerView change UI of other items when an item is clicked
body: <p>I have a <code>RecyclerView</code> in which when a user clicks on an item, the background color of the <code>RecyclerView</code> changes. When the user clicks on another item, I want the background color of the previous selected item to return to normal and the new item's background color to change. How do I do this?</p>