title: is there a way to handle key events in a widget/service?
body: <p>I would like to handle the <code>volume up</code> and <code>volume down</code> keyEvents in my App Widget.
  It really should happen in the <code>app widget</code> or a Service, not in an Activity (the homescreen should be displayed).</p>
  
  <p>But as far as i know there don't seems to be a possibility to react with the user from an app widget or service, so i can't get the keyEvents. </p>
  
  <p>So my Question is if I'm wrong and there is a possibility to get the keyEvents or maybe one to make the acitivity invisible?</p>