在 Android 上，当第一根手指从屏幕上松开时，如何判断第二根手指的位置，该手指没有移动但正在触摸屏幕

Question

I'm using Java in Android. I'm having trouble explaining this so I'll try again.

1 finger touches the screen and I use the event.getX()/Y() to get its cords.

Another finger touches the screen and I'm still getting the X/Y of the first finger.

Now the first finger is removed from the screen, however the second finger has yet to move and so it doesn't trigger the ACTION_MOVE and I can't get the event.getX()/Y() yet.

I want to know, how can I make it so even if the second finger hasn't moved yet how I can get it's X and Y as soon as the first finger releases from the screen. As of right now I'm having my character move towards the finger, and I have found it is quite common for this to happen and when it does the character continues to move towards the location of where the first finger left off until you move your finger slightly. It happens enough to make it a problem, especially for what I'm trying to do.

Answer 1

I had the same problem when I was retrieving the position touched like this:

CGPoint touchLocation = CGPoint.make(event.getX(), event.getY();

Fixed it by using:

CGPoint touchLocation = CGPoint.make(event.getX(event.getPointerCount()-1), event.getY(event.getPointerCount()-1));

Answer 2

MotionEvent has more details for the second finger. Do review the documentation.

look at the values in event.getX(1) and event.getY(1) methods.