如何在拖动操作期间取消Android中的View.OnDragListener？

Question

我view.startDrag()用来开始拖动操作.在拖动时,会收到事件OnDragListener.我也DragShadowBuilder用来显示View B拖动时的最后一张图像.

有没有办法停止或取消或中止某些外部事件或操作的拖动？例如,有2个视图,View A并且View B,我拖View B过View A.在拖动时,由于某些外部事件或操作,我想取消拖动操作或取消OnDragListener(不移除我的手指view B).

代码段DragShadowBuilder:

DragShadowBuilder shadowBuilder = new DragShadowBuilder(view) {
    @Override
    public void onDrawShadow(Canvas canvas) {
        canvas.drawBitmap(b, 0, 0, new Paint());
        super.onDrawShadow(canvas);
    }
};
boolean dragSuccess = false;
dragSuccess = view.startDrag(null, shadowBuilder, view, 0);

代码段OnDragListener:

private final class ViewDragListener implements OnDragListener {
    @Override
    public boolean onDrag(View v, DragEvent event) {
        int action = event.getAction();
        switch (event.getAction()) {
            case DragEvent.ACTION_DRAG_STARTED:
                 log("ACTION_DRAG_STARTED");
                 break;
            case DragEvent.ACTION_DRAG_ENTERED:
                 log("ACTION_DRAG_ENTERED");
                 break;
            case DragEvent.ACTION_DRAG_EXITED:
                 log("ACTION_DRAG_EXITED");
            case DragEvent.ACTION_DROP:
                 log("ACTION_DROP");
                 mX = (int) event.getX();
                 mY = (int)event.getY();
                 break;
            case DragEvent.ACTION_DRAG_ENDED:
                 log("ACTION_DRAG_ENDED");
                 //Doing some cleanup operations.
                 break;
            case DragEvent.ACTION_DRAG_LOCATION:
                 log("ACTION_DRAG_LOCATION");
                 break;
            default:
                 break;
        }
        return true;
    }
}

Answer 1

我找不到任何技巧。我尝试发送 ACTION_UP 的运动事件，但它什么也没做。只要按住用户的手指，事件层次结构似乎就不会中断。我在谷歌搜索中找不到任何帮助。

我只是设置了一个全局并等到拖动结束，然后继续。