title: Android make view disappear by clicking outside of it
body: <p>I have some views that I make visible upon a button press. I want them to disappear if I click outside of those views.</p>
  
  <p>How would this be done on Android? </p>
  
  <p>Also, I realize that the "back button" can also assist Android users with this - I might use that as a secondary way to close the views - but some of the tablets aren't even using a 'physical' back button anymore, it has been very de-emphasized.</p>