在 notifyDataSetChanged() 之后，recyclerview 滚动到顶部

Question

我有一个非常奇怪的问题，我试图解决它大约 2 天。我有一个RecyclerView，它嵌套在NestedScrollView 中。我为我的NestedScrollView 创建了EndlessScrollListener，它正确加载了更多数据，但是当我调用notifyDataSetChanged() 或notifyItemRangeChanged() 时，我的列表滚动到顶部到第二个或另一个。此外，当我想要更新我的SwipeRefreshLayout 中的所有项目时，它可能会混合（例如，来自第四项的图像可能设置在第一项等中）。这只发生在我想更新项目时，当我第一次打开我的应用程序时，一切正常。我不知道为什么会这样，请帮助我。提前致谢。我的代码 这是我初始化适配器的函数

private void setFeedRecycler(RecyclerView feedRecyclerView, List<Edge<Activity>> feeds){
    noFeedsTitle.setVisibility(View.GONE);
    feedsArray.addAll(feeds);
    LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    feedRecyclerView.setHasFixedSize(true);
    feedRecyclerView.setNestedScrollingEnabled(false);
    feedRecyclerView.setLayoutManager(layoutManager);
    feedsDashboardAdapter = new FeedsDashboardAdapter(getActivity(), this, feedsArray, feedRecyclerView, mainDashboardLayout);
    feedsDashboardAdapter.setOnLoadMoreListener(loadMoreListenerFeeds);
    feedRecyclerView.setAdapter(feedsDashboardAdapter);
}

从服务器获取数据后，我从主 UI 更新我的适配器

getActivity().runOnUiThread(new Runnable() {
       public void run() {
           feedsArray.addAll(feedMobile.getEdges());
           feedsDashboardAdapter.notifyDataSetChanged();
}});

当我想更新我的所有项目时

private SwipeRefreshLayout.OnRefreshListener refreshListener = new SwipeRefreshLayout.OnRefreshListener() {
    @Override
    public void onRefresh() {
        loadAfterCursorFeed = "";
        feedsArray.clear();
        getUserFeeds(user.getAccessToken(), user.getClientId(), loadAfterCursorFeed);
    }
};

loadAfterCursorFeed 就像数据下一页的 id。 最后是我的适配器

    public FeedsDashboardAdapter(Context context, DashboardFragment fragment, ArrayList<Edge<Activity>> feeds, RecyclerView recyclerView,
                                     NestedScrollView mainDashboardLayout){
            this.feeds = feeds;
            this.context = context;
            this.fragment = fragment;
            this.mainDashboardLayout = mainDashboardLayout;
            this.linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
            this.client = new RestClient().getApiService();
            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
            user = new Gson().fromJson(sharedPreferences.getString("user", null), User.class );
            mainDashboardLayout.setOnScrollChangeListener(new EndlessParentScrollListener(linearLayoutManager) {
                @Override
                public void onLoadMore(int page, int totalItemsCount) {
                    Log.d(TAG, "page " + page + " totalItemsCount " + totalItemsCount);
                    if (onLoadMoreListener != null) {
                        onLoadMoreListener.onLoadMore();
                    }
                }
            });
        }
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            if (viewType == VIEW_TYPE_USER_FEEDS) {
                View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_user_feed, parent, false);
                return new CategoryUserFeedHolder(layoutView, context);
            } else if(viewType == VIEW_TYPE_SHARE_EVENT) {
                View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_feed_shared_event, parent, false);
                return new CategoryShareEventHolder(layoutView);
            }  else if (viewType == VIEW_TYPE_LOADING) {
                View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.loading_item_layout, parent, false);
                return new LoadingViewHolder(layoutView);
            }
            return null;
        }
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    if (holder instanceof CategoryShareEventHolder) {
    //set necessary field
    }
    else if(holder instanceof CategoryUserFeedHolder){
    //set necessary field
    }
}
    @Override
    public int getItemCount() {
        return this.feeds ==null ? 0 : this.feeds.size();
    }

    @Override
    public int getItemViewType(int position) {
        if (feeds.get(position) == null)
            return VIEW_TYPE_LOADING;
        else if (feeds.get(position).getResponse().getEvent() != null)
            return VIEW_TYPE_SHARE_EVENT;
        return VIEW_TYPE_USER_FEEDS;
    }

    public void setOnLoadMoreListener(OnLoadMoreListener listener){
        this.onLoadMoreListener = listener;
    }

Answer 1

尝试在布局中使用没有 NestedScrollView 的 RecyclerView，看看这个答案 https://stackoverflow.com/a/31818632/6926324