onInit method
Called immediately after the widget is allocated in memory. You might use this to initialize something for the controller.
Implementation
@override
void onInit() {
  CometChat.addUserListener(userListenerID, this);
  CometChatUserEvents.addUsersListener(_uiUserListener, this);
  CometChat.addConnectionListener(userListenerID, this);
  super.onInit();
}