title: How do I pause my app when the user long-presses Home?
body: <p>If the user taps the Home key, I can pause my application because the <code>onPause</code> event fires.</p>
  
  <p>However, if the user long-presses Home, the recent app launcher pops up and my application carries on running behind it.</p>
  
  <p>I want to pause my application in this situation. What can I do?</p>
  
  <p>(NB. I don't want to prevent the long-press of Home or alter its behaviour in any way. My app just needs to know it's happened. It's a game, so I want to pause it.)</p>