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,视图A和视图B,我在视图A上拖动视图B.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(不删除我的手指视图B).

DragShadowBuilder的代码片段：

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

OnDragListener的代码片段：

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;
    }
}