在拖放过程中，图像不会保持x，y坐标

Question

我正在尝试为imageView onLongClick设置拖放功能。我注意到的问题是，对于DragEvent.ACTION_DRAG_EXITED，事件中收到的X和Y线从最后DragEvent.ACTION_DRAG_LOCATION坐标发生变化。这会导致可拖动的imageView在我删除后移动（或跳转）。这是我的实施。

首先，我在对象（imageView）上设置一个onLongClickListener，我想拖动它：

ivDrag.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                ClipData.Item item = new ClipData.Item((CharSequence)v.getTag());
                String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};
                ClipData dragData = new ClipData(v.getTag().toString(),
                mimeTypes, item);
                DragShadowBuilder mShadow = new DragShadowBuilder(v);
                v.startDrag(dragData, mShadow, v, 0); 
                dragView.setOnDragListener(dragListener);
                return true;
            }
        });

然后我在我想要拖动的对象（imageView）上设置一个onDragListener：

    ivDrag.setOnDragListener(new OnDragListener() {
         @Override
         public boolean onDrag(View v, DragEvent event) {
         // TODO Auto-generated method stub
         switch (event.getAction()) {
         case DragEvent.ACTION_DRAG_STARTED:
             layoutParams = (RelativeLayout.LayoutParams) v.getLayoutParams();
             Logger.i(TAG, "Action is DragEvent.ACTION_DRAG_STARTED");
             ivDrag.setVisibility(View.INVISIBLE);
             break;          
         case DragEvent.ACTION_DRAG_ENTERED:
             containDragable = true;
             Logger.i(TAG, "Action is DragEvent.ACTION_DRAG_ENTERED");
             x_cord = (int) event.getX();
             y_cord = (int) event.getY();
             Logger.i(TAG, "x_cord: " + x_cord + " //y_cord: " + y_cord);   
             break;      
         case DragEvent.ACTION_DRAG_EXITED:
             containDragable = false;
             Logger.i(TAG, "Action is DragEvent.ACTION_DRAG_EXITED");
             x_cord = (int) event.getX(); // removing this line allows correct cords
             y_cord = (int) event.getY(); // removing this line allows correct cords
             Logger.d(TAG, "x_cord: " + x_cord + " //y_cord: " + y_cord);

             // below re-positions the drag object
             layoutParams.leftMargin = x_cord;
             layoutParams.topMargin = y_cord;
             v.setLayoutParams(layoutParams);        
             break;      
         case DragEvent.ACTION_DRAG_LOCATION:
             Logger.i(TAG, "Action is DragEvent.ACTION_DRAG_LOCATION");
             x_cord = (int) event.getX();
             y_cord = (int) event.getY();
             Logger.i(TAG, "x_cord: " + x_cord + " //y_cord: " + y_cord);
             break;          
         case DragEvent.ACTION_DRAG_ENDED :
             Logger.i(TAG, "Action is DragEvent.ACTION_DRAG_ENDED");
             // below is what makes sure the image does not disappear
             ivDrag.post(new Runnable() {
                 @Override
                 public void run() {
                     // TODO Auto-generated method stub
                     Logger.e(TAG, "inside runnable");
                     if (ivDrag.getVisibility() != View.VISIBLE) {
                         ivDrag.setVisibility(View.VISIBLE);
                     }
                 }       
             });         
             break;
         case DragEvent.ACTION_DROP:
             Logger.i(TAG, "ACTION_DROP event");
             // Do nothing
             break;
         default:
             break;
         }
         return true;
         }
    });
}

注意：如上所述，如果我从DragEvent.ACTION_DRAG_EXITED中移除x，y绳索的更新，则日志会指示正确的坐标。但是，之后我无法重新拖动对象。

最后，我在将对象拖入容器时创建了一个监听器。

private View.OnDragListener dragListener = new View.OnDragListener() {  
    @Override 
    public boolean onDrag(View v, DragEvent event) {    
        switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            Logger.v(TAG, "drag started (onDrag)");
            break; 
        case DragEvent.ACTION_DRAG_ENTERED:
            Logger.v(TAG, "drag entered (onDrag)");
            break; 
        case DragEvent.ACTION_DRAG_EXITED:
            Logger.v(TAG, "drag exited (onDrag)");
            break; 
        case DragEvent.ACTION_DROP:
            Logger.e(TAG, "drop (onDrag)");
            // handle drop 
            break; 
        case DragEvent.ACTION_DRAG_ENDED:
            Logger.v(TAG, "drag ended (onDrag)");
            break; 
        default: 
            return false; 
        } 
        return true; 
    } 
};

我错过了如何按预期工作？提前谢谢！