如何使用 DragEvent.getLocalState() 在拖放过程中访问父视图（LinearLayout）？

Question

如上图所示，我有 3 个 LinearLayout，每个里面都有一个 ImageView 和一个 TextView。每个图像视图都附加了一个 OnLongClickListener。封装所有对象的 AbsoluteLayout 附加了一个 OnDragListener。

在 onDrag 方法中，我需要获取作为我正在拖动的 ImageView 的父级的 LinearLayout，以便我可以重新定位整个 LinearLayout 设置上边距和左边距。

我写了下面的代码希望我可以访问父 LinearLayout 但没有成功。

@Override
public boolean onDrag(View view, DragEvent event) {
if(event.getAction() == DragEvent.ACTION_DROP){
View v = (View) event.getLocalState();
ImageView iv = (ImageView) v;
ViewParent parent = iv.getParent();
LinearLayout l;
if (parent == null) {
     Log.d("TEST", "this.getParent() is null");
}
else {
      if (parent instanceof ViewGroup) {
           ViewParent grandparent = ((ViewGroup) parent).getParent();
           if (grandparent == null) {
                 Log.d("TEST", "((ViewGroup) this.getParent()).getParent() is null");
                        }
       else {
            if (parent instanceof AbsoluteLayout) {
                l = (LinearLayout) grandparent;
               Log.d("TEST","Successfully acquired linear layout");
                            }
                            else {
                                Log.d("TEST", "((ViewGroup) this.getParent()).getParent() is not a RelativeLayout");
                            }
                        }
                    }
                    else {
                        Log.d("TEST", "this.getParent() is not a ViewGroup");
                    }
                }}

Answer 1

事实证明它就像执行以下操作一样简单

@Override
public boolean onDrag(View view, DragEvent event) {
    String TAG = "DragDrop";
    switch (event.getAction()) {
        case DragEvent.ACTION_DROP: {
            View v = (View) event.getLocalState();
            ImageView iv = (ImageView) v;

            ViewParent parent = iv.getParent();
            LinearLayout l = (LinearLayout) parent;
            AbsoluteLayout.LayoutParams params = (AbsoluteLayout.LayoutParams)l.getLayoutParams();
            x = (int) event.getX() - (l.getWidth() / 2);
            y = (int) event.getY() - (l.getHeight() / 2) + 30;
            params.x = x;
            params.y = y;
            l.setLayoutParams(params);

            iv.setVisibility(iv.VISIBLE);
            //boardName.setVisibility(View.VISIBLE);

            break;
        }
    }
    return true;
}

如何使用 DragEvent.getLocalState() 在拖放过程中访问父视图（LinearLayout）？

How to access paren (LinearLayout) t of view during DragAndDrop using DragEvent.getLocalState()?

android

drag-and-drop

absolutelayout

android-linearlayout