DialogFragment中的RecyclerView在最后一个元素的通知更改后向上滚动

Question

我在我的项目中用RecyclerViews替换了ListViews。我有一个与recyclerview对话，我想在点击后更改其中的项目。但是我有问题，当我尝试点击最后一个元素时，RecyclerView会向上滚动。

在空活动中，我只创建如下对话框：

CustDialog dlg = new CustDialog();
dlg.show(getFragmentManager(), "dlg1");

此处的对话框代码：

public class CustDialog extends DialogFragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.dialog, null);
    RecyclerView recyclerView = (RecyclerView) v.findViewById(R.id.recycler_view);

    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    MyAdapter adapter = new MyAdapter();
    recyclerView.setAdapter(adapter);
    return v;
}

static class MyViewHolder extends RecyclerView.ViewHolder {
    TextView textView;

    public MyViewHolder(View itemView) {
        super(itemView);
        textView = (TextView) itemView.findViewById(android.R.id.text1);
    }
}

static class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {
    List<String> mItems;

    public MyAdapter() {
        mItems = new ArrayList<>();
        for (int i = 0; i < 50; i++) {
            mItems.add("Test " + i);
        }
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.minimal, parent, false);
        return new MyViewHolder(v);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        String item = mItems.get(position);
        holder.textView.setText(item);
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                notifyItemChanged(position);
            }
        });
    }

    @Override
    public int getItemCount() {
        return mItems.size();
    }
}
}

对话框布局仅包含带有replalerviewview的LinearLayout，其中包含match_parent参数。项目布局包含带有textview的LinearLayout。

如果您在点击最后一个元素后尝试此示例，则recyclelerview会以两个或三个元素的距离向上滚动。