public class GoogleCloudMessagingIntentService extends IntentService {

  public GoogleCloudMessagingIntentService() {
    super(Constants.TAG);
  }
  
  @Override
  protected void onHandleIntent(Intent intent) {
    // the intent is supplied via the BroadcastReceiver
    
    GoogleCloudMessaging googleCloudMessaging = GoogleCloudMessaging.getInstance(this);
    
    String messageType = googleCloudMessaging.getMessageType(intent);
    
    Bundle extras = intent.getExtras();
    if (!extras.isEmpty()) {
      // filter the message according to its type
      if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR.equals(messageType)) {
        sendNotification(extras);
      } else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED.equals(messageType)) {
        sendNotification(extras);
      } else if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE.equals(messageType)) {
        sendNotification(extras);
      }
    }
    
    // release the wake lock provided by the WakefulBroadcastReceiver.
    GoogleCloudMessagingBroadcastReceiver.completeWakefulIntent(intent);
  }
  
  // create a notification containing the message and post it
  private void sendNotification(Bundle bundle) {
    Intent notificationHandlerIntent = new Intent(this, NotificationHandlerActivity.class);
    notificationHandlerIntent.putExtras(bundle);
    
    TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(this);
    taskStackBuilder.addParentStack(NotificationHandlerActivity.class);
    taskStackBuilder.addNextIntent(notificationHandlerIntent);
    
    PendingIntent notificationHandlerPendingIntent = taskStackBuilder.getPendingIntent(
      0,
      PendingIntent.FLAG_UPDATE_CURRENT);
      
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
      .setSmallIcon(R.drawable.ic_launcher)
      .setContentTitle(Constants.TAG)
      .setStyle(new NotificationCompat.BigTextStyle().bigText(Constants.NOTIFICATION_MESSAGE))
      .setContentText(Constants.NOTIFICATION_MESSAGE);
      
    builder.setContentIntent(notificationHandlerPendingIntent);
      
    NotificationManager notificationManager = (NotificationManager)this.getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(Constants.NOTIFICATION_ID, builder.build());
  }
}