title: Android c2dm push notifications after app reinstall
body: <p>I have the following question:</p>
  
  <p>I've successfully implemented C2DM in my application. I'm registering to both google c2dm cloud and a custom server that "creates" notification contents. Everything is working fine.
  My question is : what happens when i uninstall my app and then reinstall it on the same device? I've noticed that C2DM is sending me back the same app_key, so apparently there's no way to determine my app installation status change. And i keep on receiving old push notification (they're customized by user preferences in the app).
  I won't be able to test with a google play published app until final release, so i would like to know if there's a chance that google itself could notify c2dm that the app was uninstalled on my device and force it to change my app_id at next restart.</p>
  
  <p>Thanks in advance
  Stefano</p>