如何在android中实现"Two finger swipe"手势？

Question

我进行了很多研究，但我什至找不到一个讲述 MultiTouch 事件的博客。所有人都在提供单次滑动教程。我希望在同一 activity.

中同时应用 fling 和 2 指滑动

Answer 1

经过多次尝试和失败后，我自己找到了解决方案

@Override
public boolean onTouchEvent(MotionEvent event) {
  

    Log.d(TAG, "onTouchEvent: " + event.getAction());
    //with the getPointerCount() i'm able to get the count of fingures
    if(event.getPointerCount()>1){
        switch (event.getAction() & MotionEvent.ACTION_MASK)
        {
            case MotionEvent.ACTION_POINTER_DOWN:
                // This happens when you touch the screen with two fingers
                mode = SWIPE;
                // event.getY(1) is for the second finger
                p1StartY = event.getY(0);
                p2StartY = event.getY(1);
                break;

            case MotionEvent.ACTION_POINTER_UP:
                // This happens when you release the second finger
                mode = NONE;
                float p1Diff = p1StartY - p1StopY;
                float p2Diff = p2StartY - p2StopY;

               //this is to make sure that fingers go in same direction and 
               // swipe have certain length to consider it a swipe
                if(Math.abs(p1Diff) > DOUBLE_SWIPE_THRESHOLD
                        && Math.abs(p2Diff) >DOUBLE_SWIPE_THRESHOLD &&
                        ( (p1Diff>0 && p2Diff>0) || (p1Diff < 0 && p2Diff<0) ))
                {
                    if(p1StartY > p1StopY)
                    {
                        // Swipe up
                        doubleSwipeUp();
                    }
                    else
                    {
                        //Swipe down
                        doubleSwipeDown();
                    }
                }
                this.mode = NONE;
                break;

            case MotionEvent.ACTION_MOVE:
                if(mode == SWIPE)
                {
                    p1StopY = event.getY(0);
                    p2StopY = event.getY(1);
                }
                break;
        }

    }
    else if(event.getPointerCount() == 1){
       //this is single swipe, I have implemented onFling() here
        this.gestureObject.onTouchEvent(event);
    }

    return false;
}

如何在android中实现"Two finger swipe"手势？

How to implement "Two finger swipe" gesture in android?

java

android

gesture