Android 为多个 ImageView 触发 onTouch 事件 [英] Android firing onTouch event for multiple ImageViews

问题描述

我有几个 ImageView，当我在多个图像上拖动手指时，我希望为每个 ImageView 触发 onTouch 事件.目前 onTouch 事件仅在第一个 ImageView 上触发(或实际上在多个 ImageView 上但仅在多点触摸屏幕时触发).伪代码:

I have several ImageViews, and I want the onTouch event to fire for each of them when I drag my finger across multiple images. At present the onTouch event is only firing on the first ImageView (or actually on multiple ImageViews but only when multitouching the screen). Pseudo code:

            for(int i=0;i<5;i++){
              ImageView img=new ImageView(this);
              LinearLayout.LayoutParams layoutParams=new LinearLayout.LayoutParams(width,height);
              img.setImageResource(R.drawable.cell);
              img.setOnTouchListener(this);
              mainLayout.addView(img,layoutParams);
            }
            ...

            public boolean onTouch (View v, MotionEvent event){
              Log.d("MY_APP","View: " + v.getId());
              return false;
            }

我是不是完全找错树了?

Am I barking up completely the wrong tree?

感谢您的帮助.

推荐答案

我认为您需要使用移动事件而不是触摸事件并将getX和getY与您的视图位置进行比较.

I think you need to use move event rather than touch event and compare getX and getY with the location of your views.

     @Override
    public boolean onTouchEvent(MotionEvent ev) {

        final int action = ev.getAction();

        switch (action) {

            // MotionEvent class constant signifying a finger-down event

            case MotionEvent.ACTION_DOWN: {
                break;
            }

            // MotionEvent class constant signifying a finger-drag event  

            case MotionEvent.ACTION_MOVE: {

                    X = ev.getX();
                    Y = ev.getY();
                    //compare here using a loop of your views
                    break;

            }

            // MotionEvent class constant signifying a finger-up event

            case MotionEvent.ACTION_UP:

                break;

        }
        return true;
    }

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