如何检测在一个ImageView的第二个手指触摸？ [英] How to detect the second finger touch on an ImageView?

问题描述

我如何可以检测多点触控事件？在code我尝试是：

How can I detect multitouch events? The code im trying is:

ImageView im = (ImageView) findViewById(R.id.imageView1);
im.setOnTouchListener(new OnTouchListener() {
  @Override
  public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction() & MotionEvent.ACTION_MASK) {
      case MotionEvent.ACTION_POINTER_DOWN:
        Log.e("case MotionEvent.ACTION_POINTER_DOWN","case MotionEvent.ACTION_POINTER_DOWN");
        break;
      case MotionEvent.ACTION_DOWN:
        Log.e("case MotionEvent.ACTION_DOWN","case MotionEvent.ACTION_DOWN");
        break;
      case MotionEvent.ACTION_UP:
        Log.e("case MotionEvent.ACTION_UP","case MotionEvent.ACTION_UP");
        break;
      case MotionEvent.ACTION_MOVE:
        Log.e("case MotionEvent.ACTION_MOVE","case MotionEvent.ACTION_MOVE");
        break;
    }
    return false;
  }
});

有检测第一触摸和在日志猫的输出为MotionEvent.ACTION_POINTER_DOWN。如何知道第二触摸是否发生？

It detects the first touch and the output in the log cat is MotionEvent.ACTION_POINTER_DOWN. How to know whether a second touch has taken place?

推荐答案

有很多方法可以做到这一点，所以你可以选择很多，这里的一些环节有写一个完整的应用程序来处理多点触摸。一​​个

There are many ways to do it, so u can choose one of many here some link have write a complete application to handle multi touch.

多点触控

多触摸处理

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