我如何在Gridlayout中再次设置Visible？

Question

我的Imageview在网格布局中当我触摸imageview时我有一个ontouchlisteners我在Invisible中设置它，当我删除I​​mageview时我有一个DragListener

  

错误（ConcurrentModificationException的）

出现我想要做的是当我放下Imageview Imageview I Touch再次设置为Visible时。

我该如何做到这一点？

这是我的代码

   @Override
public boolean onDrag(View v, DragEvent event) {
    int dragEvent = event.getAction();
    final View views = (View)event.getLocalState();
    switch (dragEvent) {
  case DragEvent.ACTION_DRAG_ENTERED:
            break;

  case DragEvent.ACTION_DRAG_EXITED:
            break;

   case DragEvent.ACTION_DROP:
            views.setVisibility(View.VISIBLE);
            break;

        case DragEvent.ACTION_DRAG_ENDED:
            views.setVisibility(View.VISIBLE);

            break;
    }
    return true;
}

@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
    if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
        ClipData data = ClipData.newPlainText("", "");
        View.DragShadowBuilder myshadowBuilder = new View.DragShadowBuilder(view);
        view.startDrag(data, myshadowBuilder, view, 0);
        view.setVisibility(View.INVISIBLE);
        return true;
    } else {
        return false;
    }
}