为什么onLongPress（）不像其他所有SimpleOnGestureListener一样返回布尔值？

Question

As the title states. The fact that I can't consume the event is causing a click event to occur immediately afterwards. Now I am manually keeping track of whether or not a longpress has occurred when handling a potential click.

Am I missing something here? I mean, I can't even get around this trying to implement the OnGestureListener interface because it expects a void for onLongPress() . What are my options?

Answer 1

I think the onLongPress don't like the onDown these, the return value of the onLongPress is not used to check something, but the return value of onDown is useful to the system, it will help the system to recognitive another events. From the android source code:

   mStillDown = true;
   mInLongPress = false;
   if (mIsLongpressEnabled) {
      mHandler.removeMessages(LONG_PRESS);
      mHandler.sendEmptyMessageAtTime(LONG_PRESS, mCurrentDownEvent.getDownTime() +      TAP_TIMEOUT + LONGPRESS_TIMEOUT);
    }
       mHandler.sendEmptyMessageAtTime(SHOW_PRESS, mCurrentDownEvent.getDownTime() + TAP_TIMEOUT);
      handled |= mListener.onDown(ev);

the onLongPress and ShowPress just tell these situations happend. The return value is not useful for system.

And if you want to implement your design, you can use the varable to check whether the LongPress happened. Hope this can help you.