You will need to setup your project to use the
Google Play Services library as described here:

http://developer.android.com/google/play-services/setup.html

You also need the v4 support library:

http://developer.android.com/training/basics/fragments/support-lib.html

To run this application, you must have a Sender ID
and a GCM server. For details, see:

http://developer.android.com/google/gcm/gs.html