@Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_welcome);
   initUI();
   LocalBrCast.register(this, LocalBrCast.PARAM_WELACT_TRANSACTIVITY, receiver);
 }
 @Override
 protected void onDestroy() {
   super.onDestroy();
   LocalBrCast.unregisterReceiver(this, receiver);
 }
 @Override
 protected void onPostCreate(Bundle savedInstanceState) {
   super.onPostCreate(savedInstanceState);
   mHelper.onPostCreate();
 }
 @Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   mHelper = new SwipeBackActivityHelper(this);
   mHelper.onActivityCreate();
 }