如何在长按 ContextMenuItemSelected 时从 ExpandableListView 中删除项目？

Question

我正在尝试使用上下文菜单从 ExpandableListView 中删除一个项目。我遇到了空指针异常。请帮我解决这个问题。以下是我的代码：

@Override
public boolean onContextItemSelected(@NonNull MenuItem item) {
        super.onContextItemSelected(item);
        switch(item.getItemId())
        {
            case R.id.deleteItem:
                AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
                    int position = info.position;
                    //this is my ArrayList                    
                    postList.remove(position);
                    Toast.makeText(getActivity().getApplicationContext(), "Deleted an item", Toast.LENGTH_LONG).show();
                    listAdapter.notifyDataSetChanged();
                break;
            case R.id.editItem:
                break;
        }

        return true;
    }

Answer 1

ContextMenuInfo 类型错误，Expandablelistview 中的项目有 2 个位置值，

    ExpandableListView.ExpandableListContextMenuInfo info = (ExpandableListView.ExpandableListContextMenuInfo) item.getMenuInfo();
    int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); 
    int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);