title: AS3 - reactivate "back button" override in Air for Android after task-switching
body: <p>I couldn't find an answer to this question, maybe someone around here can help me. I'm coding a game for Android with flash/as3, and override the "back" and "menu" buttons. This works fine by adding eventlisteners and preventing default:</p>
  
  <pre><code>NativeApplication.nativeApplication.addEventListener(KeyboardEvent.KEY_DOWN, myaction);
  </code></pre>
  
  <p>However, when I press "home", the game minimizes (as it should). But when the users returns to the game after that, these listeners won't fire anymore. Creating new event listeners that I call on <code>Event.ACTIVATE</code> (so when the app is re-focused) wont help either. How can I "reactivate" the back button listeners when the user task-switches back???</p>