import com.google.ipc.invalidation.external.client.contrib.MultiplexingGcmListener; //导入依赖的package包/类
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
  Log.i(TAG, "[onCreate] Creating main activity");
  super.onCreate(savedInstanceState);

  MultiplexingGcmListener.initializeGcm(this);

  // Create and start a notification client. When the client is available, or if there is an
  // existing client, AndroidListener.reissueRegistrations() is called.
  Context context = getApplicationContext();
  Intent startIntent = AndroidListener.createStartIntent(context, CLIENT_TYPE, CLIENT_NAME);
  context.startService(startIntent);

  // Setup UI.
  info = new TextView(this);
  setContentView(info);

  // Remember the current activity since the TICL service in this example communicates via
  // static state.
  State.currentActivity = this;
  Log.i(TAG, "[onCreate] Calling refresh data from main activity");
  refreshData();
}