用户对问题“Android多点触控的问题？”的回答 - 问答 - 云+社区

Android多点触控的问题？
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代码如下：

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction() & MotionEvent.ACTION_MASK;
        int pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_ID_MASK) >> MotionEvent.ACTION_POINTER_ID_SHIFT;
        int pointerId = event.getPointerId(pointerIndex);
        switch (action) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_POINTER_DOWN:
            if (pointerId == 0)
            {
                fingerOneDown = 1;
                fingerOneX = event.getX(pointerIndex);
                fingerOneY = event.getY(pointerIndex);
            }
            if (pointerId == 1)
            {
                fingerTwoDown = 1;
                fingerTwoX = event.getX(pointerIndex);
                fingerTwoY = event.getY(pointerIndex);
            }
            break;

        case MotionEvent.ACTION_UP:          
        case MotionEvent.ACTION_POINTER_UP:
        case MotionEvent.ACTION_CANCEL:
            if (pointerId == 0)
            {
                fingerOneDown = 0;
                fingerOneX = event.getX(pointerIndex);
                fingerOneY = event.getY(pointerIndex);
            }
            if (pointerId == 1)
            {
                fingerTwoDown = 0;
                fingerTwoX = event.getX(pointerIndex);
                fingerTwoY = event.getY(pointerIndex);
            }
            break;

        case MotionEvent.ACTION_MOVE:
            if (pointerId == 0)
            {
                fingerOneDown = 1;
                fingerOneX = event.getX(pointerIndex);
                fingerOneY = event.getY(pointerIndex);
            }
            if (pointerId == 1)
            {
                fingerTwoDown = 1;
                fingerTwoX = event.getX(pointerIndex);
                fingerTwoY = event.getY(pointerIndex);
            }

            break;
        }
        return true;
    }

提问于 2018-02-092018-02-09 06:59:00

用户回答回答于 2018-02-092018-02-09 16:23:55

可以这样：

       case MotionEvent.ACTION_MOVE:

        int pointerCount = event.getPointerCount();
        for(int i = 0; i < pointerCount; ++i)
        {
            pointerIndex = i;
            pointerId = event.getPointerId(pointerIndex);
            Log.d("pointer id - move",Integer.toString(pointerId));
            if(pointerId == 0)
            {
                fingerOneDown = 1;
                fingerOneX = event.getX(pointerIndex);
                fingerOneY = event.getY(pointerIndex);
            }
            if(pointerId == 1)
            {
                fingerTwoDown = 1;
                fingerTwoX = event.getX(pointerIndex);
                fingerTwoY = event.getY(pointerIndex);
            }
        }
        break;

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可以这样： case MotionEvent.ACTION_MOVE: int pointerCount = event.getPointerCount(); for(int i = 0; i < pointerCount; ++...

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