title: Customizing the background of an Android notification tile
body: <p>I noticed that one of my Android apps has set a custom background for its notification tile, as you can see in the screenshot below:</p>
  <p><a href="https://i.stack.imgur.com/179uS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/179uS.png" alt="" /></a></p>
  <p>How did this application set a custom background for its notification? How can I achieve the same thing in my own application?</p>