test.java

GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(_context);
new AsyncTask<GoogleCloudMessaging, Void, String>() {
	@Override
	protected String doInBackground(GoogleCloudMessaging... params) {
		String msg = "";
		try {
			GoogleCloudMessaging message = params[0];
			String regid = message.register(GOOGLE_SENDER_ID);
 
			sendGCMIDToServer(regid);
 
		} catch (IOException ex) {
			msg = "Error :" + ex.getMessage();
		}
		return msg;
	}
 
}.execute(gcm, null, null);