Android的多点触控 - 食指ACTION.MOVE忽略 [英] Android Multitouch - Second Finger ACTION.MOVE Ignored

问题描述

下面code是什么，我一直在尝试使用多点触控。手指一个是设置正确，走动的时候我拖我的手指。手指两个节目和消失，当我触摸后我的手指，但它永远不会四处移动。任何想法有什么不对？

我已经阅读开发者博客我还是不明白的问题。

  @覆盖
    公共布尔的onTouchEvent（MotionEvent事件）{
        INT行动= event.getAction（）及MotionEvent.ACTION_MASK;
        INT pointerIndex =（event.getAction（）及MotionEvent.ACTION_POINTER_ID_MASK）GT;＆GT; MotionEvent.ACTION_POINTER_ID_SHIFT;
        INT pointerId = event.getPointerId（pointerIndex）;
        开关（动作）{
        案例MotionEvent.ACTION_DOWN：
        案例MotionEvent.ACTION_POINTER_DOWN：
            如果（pointerId == 0）
            {
                fingerOneDown = 1;
                fingerOneX = event.getX（pointerIndex）;
                fingerOneY = event.getY（pointerIndex）;
            }
            如果（pointerId == 1）
            {
                fingerTwoDown = 1;
                fingerTwoX = event.getX（pointerIndex）;
                fingerTwoY = event.getY（pointerIndex）;
            }
            打破;

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

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

            打破;
        }
        返回true;
    }
 

解决方案

没关系这一点。我修好了它。该ACTION.MOVE事件总是得到零作为pointerId一些奇怪的原因。正因为如此，你总是要在事件内重新计算pointerId如下所示：

 案例MotionEvent.ACTION_MOVE：

        INT pointerCount = event.getPointerCount（）;
        的for（int i = 0; I＆LT; pointerCount ++ I）
        {
            pointerIndex =我;
            pointerId = event.getPointerId（pointerIndex）;
            Log.d（指针ID  - 移动，Integer.toString（pointerId））;
            如果（pointerId == 0）
            {
                fingerOneDown = 1;
                fingerOneX = event.getX（pointerIndex）;
                fingerOneY = event.getY（pointerIndex）;
            }
            如果（pointerId == 1）
            {
                fingerTwoDown = 1;
                fingerTwoX = event.getX（pointerIndex）;
                fingerTwoY = event.getY（pointerIndex）;
            }
        }
        打破;
 

The following code is what I've been trying to use for multitouch. Finger one is set correctly and moves around when I drag my finger. Finger two shows up and disappears when I touch and release my finger, but it never moves around. Any idea what's wrong?

I have read developers blog I still do not understand what the issues are.

    @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;
    }

解决方案

Nevermind this. I fixed it. The ACTION.MOVE event always gets zero as the pointerId for some strange reason. Because of this, you always have to recalculate the pointerId within the event as seen below:

       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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