Android拖放TextView错误

Question

我跟着this tutorial进行了拖放功能，除了一个奇怪的bug之外它还能正常工作。

将textview A拖到Textview B上假设为：

1. 隐藏textview A
2. 将标记从textview A传递到textview B
3. 重新显示textview B
上传递的数据

将数据从textview A传递到B可以100％的时间工作，但奇怪的是，textview A在100％的时间内都不会隐藏。我不知道它是否是我将它拖过textview B或其他东西的方式。知道我怎么能让它更稳定吗？

public boolean onDrag(View v, DragEvent event) {
        //handle drag events
        switch (event.getAction()) {
           case DragEvent.ACTION_DROP:
            //handle the dragged view being dropped over a drop view

            View view = (View) event.getLocalState();
            //stop displaying the view where it was before it was dragged
            view.setVisibility(View.INVISIBLE);
            //view dragged item is being dropped on
            TextView dropTarget = (TextView) v;
            //view being dragged and dropped
            TextView dropped = (TextView) view;
            //update the text in the target view to reflect the data being dropped
            dropTarget.setText(dropped.getText());
            //make it bold to highlight the fact that an item has been dropped
            dropTarget.setTypeface(Typeface.DEFAULT_BOLD);
            //if an item has already been dropped here, there will be a tag
            Object tag = dropTarget.getTag();
            //if there is already an item here, set it back visible in its original place
            if(tag!=null)
            {
                //the tag is the view id already dropped here
                int existingID = (Integer)tag;
                //set the original view visible again
                findViewById(existingID).setVisibility(View.VISIBLE);
            }
            //set the tag in the target view to the ID of the view being dropped
            dropTarget.setTag(dropped.getId());
            // check choice
            checkChoice(dropped,dropTarget);
            break;

Answer 1

认为我发现了问题

if(tag!=null)
        {
            //the tag is the view id already dropped here
            int existingID = (Integer)tag;
            //set the original view visible again   
            //findViewById(existingID).setVisibility(View.VISIBLE);   COMMENT THIS OUT
        }