MainActivity.java

import com.microsoft.windowsazure.messaging.*;
import com.microsoft.windowsazure.notifications.*;

//full source at https://github.com/sedouard/AMSCrossPlatPush/blob/master/GoogleAndriod/CrossPlatformPush/src/com/example/crossplatformpush/MainActivity.java
public class MainActivity extends ActionBarActivity {

	private final String PROJECT_NUMBER = "<YOUR PROJECT NUMBER FROM GOOGLE PLAY>";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //register our handler to the notifications manager
        NotificationsManager.handleNotifications(this, PROJECT_NUMBER, Handler.class);
        
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment())
                    .commit();
        }
    }
}