Question

我有一个表示按钮的ImageView，以及一个用于更改图像的相对OnTouchListener（用于模拟压力）并启动任务：

@Override
public boolean onTouch(View v, MotionEvent event) {
    ImageView button = (ImageView) v;

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN: {
        //change imageview image with pressed button
        return true;

    }
    case MotionEvent.ACTION_UP: {
            //change imageview image, and do a task
            return true;
    }

    }
    return false;
}

现在这两个事件对我的范围来说还不够。我想，如果用户将手指按在ImageView上并在其外滑动，ACTION_UP内的任务将不会执行。我该怎么办？

Answer 1

以下是View.OnTouchListener，您可以使用MotionEvent.ACTION_UP查看当用户的手指在视图之外时是否发送了private OnTouchListener mOnTouchListener = new View.OnTouchListener() { private Rect rect; @Override public boolean onTouch(View v, MotionEvent event) { if (v == null) return true; switch (event.getAction()) { case MotionEvent.ACTION_DOWN: rect = new Rect(v.getLeft(), v.getTop(), v.getRight(), v.getBottom()); return true; case MotionEvent.ACTION_UP: if (rect != null && !rect.contains(v.getLeft() + (int) event.getX(), v.getTop() + (int) event.getY())) { // The motion event was outside of the view, handle this as a non-click event return true; } // The view was clicked. // TODO: do stuff return true; default: return true; } } };：

{{1}}

当触摸进入视图外时，OnTouchListener拦截

1 个答案: