在recyclerView中如何使用LazyLoader和PullToRefresh？

Question

为什么没有人帮助我？？？我真的需要你的帮助

在我的应用程序中，我想使用 PullToRefresh 和 LazyLoader 功能，为此我编写了以下代码并为我工作。

但我有一个问题，当 PullToRefresh recyclerView 和滚动 recyclerView 时不显示更多项目。

我的意思是：当使用 pullToRefresh 时，则不起作用 lazyLoader!

我的代码：

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        Constants.listeners.add(this);
        View v = inflater.inflate(R.layout.fragment_auction_current_tab, null);
        ButterKnife.bind(this, v);
        context = getActivity();
        handler = new Handler();
        list = v.findViewById(R.id.list);
        prefsUtils = new PrefsUtils(getActivity());
        apis = ApiClient.getClient().create(APIs.class);
        swipeToRefresh = v.findViewById(R.id.swipeToRefresh);

        jwtToken = Constants.settings.getString("jwt_token", "");

        list_item = getActivity().findViewById(R.id.list_item);
        linearLayoutManager = new LinearLayoutManager(context);
        auctionListAdapter = new AuctionsListAdapter(context, todayModel, R.layout.list_item_auction_normal_new);
        list.setLayoutManager(linearLayoutManager);
        list.setHasFixedSize(true);
        list.setAdapter(auctionListAdapter);
        list.setOnScrollListener(new EndlessRecyclerLinearPage(linearLayoutManager) {
            @Override
            public void onLoadMore(final int current_page) {
                miniLoader.setVisibility(View.VISIBLE);
                Call<AuctionsListResponse> call = apis.getTodatAuctions(jwtToken, current_page, 10);
                call.enqueue(new Callback<AuctionsListResponse>() {
                    @Override
                    public void onResponse(Call<AuctionsListResponse> call, Response<AuctionsListResponse> response) {
                        if (response.isSuccessful()) {
                            if (response.body() != null) {
                                if (response.body().getRes() != null) {
                                    if (response.body().getRes().getToday().size() > 0 && response.body().getRes().getToday() != null) {
                                        miniLoader.setVisibility(View.GONE);
                                        auctionListAdapter.addNewItem(response.body().getRes().getToday());
                                    } else {
                                        miniLoader.setVisibility(View.GONE);
                                    }
                                }
                            }
                        }
                    }

                    @Override
                    public void onFailure(Call<AuctionsListResponse> call, Throwable t) {

                    }
                });
            }
        });
        getData();
        swipeToRefresh.setColorSchemeResources(R.color.colorAccent);
        swipeToRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                getData();
            }
        });

        return v;
    }

    private void getData() {
        Call<AuctionsListResponse> call = apis.getTodatAuctions(jwtToken, 1, 10);
        call.enqueue(new Callback<AuctionsListResponse>() {
            @Override
            public void onResponse(Call<AuctionsListResponse> call, Response<AuctionsListResponse> response) {
                if (response.isSuccessful()) {
                    if (response.body() != null) {
                        if (response.body().getRes() != null) {
                            if (response.body().getRes().getToday().size() > 0 && response.body().getRes().getToday() != null) {
                                todayModel.clear();
                                todayModel.addAll(response.body().getRes().getToday());
                                auctionListAdapter.notifyDataSetChanged();
                                itemsLoader.setVisibility(View.GONE);
                                if (swipeToRefresh != null) {
                                    swipeToRefresh.setRefreshing(false);
                                }
                            }
                        }
                    }
                }
            }

            @Override
            public void onFailure(Call<AuctionsListResponse> call, Throwable t) {

            }
        });
    }
}

我该如何解决这个问题？

Answer 1

我认为问题出在你的getData()方法上。

为什么？当您从 RecyclerView.Adapter 调用 notifyDataSetChanged() 时，它会告诉您的适配器再次检查它拥有的列表，并完全重新绑定和重绘 RecyclerView 中的所有内容。但问题是，在你的 getData() 中你只设置了 todayModel 列表，它是你的 Fragment.

中的对象引用

因此，您需要修改 Adapter 中的列表 才能成功 notifyDataSetChanged().

实际上，您在 onLoadMore() 中所做的修改 inside 适配器中的列表是正确的。您应该在 getData().
中做相同（或类似）的事情
示例代码：

@Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { super.onCreateView(inflater, container, savedInstanceState); Constants.listeners.add(this); View v = inflater.inflate(R.layout.fragment_auction_current_tab, null); ButterKnife.bind(this, v); context = getActivity(); handler = new Handler(); list = v.findViewById(R.id.list); prefsUtils = new PrefsUtils(getActivity()); apis = ApiClient.getClient().create(APIs.class); swipeToRefresh = v.findViewById(R.id.swipeToRefresh); jwtToken = Constants.settings.getString("jwt_token", ""); list_item = getActivity().findViewById(R.id.list_item); linearLayoutManager = new LinearLayoutManager(context); auctionListAdapter = new AuctionsListAdapter(context, todayModel, R.layout.list_item_auction_normal_new); list.setLayoutManager(linearLayoutManager); list.setHasFixedSize(true); list.setAdapter(auctionListAdapter); list.setOnScrollListener(new EndlessRecyclerLinearPage(linearLayoutManager) { @Override public void onLoadMore(final int current_page) { miniLoader.setVisibility(View.VISIBLE); getData(currentPage); } }); getData(1); swipeToRefresh.setColorSchemeResources(R.color.colorAccent); swipeToRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { getData(1); } }); return v; } private void getData(int page) { Call<AuctionsListResponse> call = apis.getTodatAuctions(jwtToken, page, 10); call.enqueue(new Callback<AuctionsListResponse>() { @Override public void onResponse(Call<AuctionsListResponse> call, Response<AuctionsListResponse> response) { if (response.isSuccessful()) { if (response.body() != null) { if (response.body().getRes() != null) { if (response.body().getRes().getToday().size() > 0 && response.body().getRes().getToday() != null) { todayModel.clear(); todayModel .addAll(response.body() .getRes() .getToday()); //NOTICE THE DIFFERENCE HERE auctionListAdapter.setModel(todayModel); auctionListAdapter.notifyDataSetChanged(); itemsLoader.setVisibility(View.GONE); if (swipeToRefresh != null) { swipeToRefresh.setRefreshing(false); } miniLoader.setVisibility(View.GONE); } } } } } @Override public void onFailure(Call<AuctionsListResponse> call, Throwable t) { itemsLoader.setVisibility(View.GONE); if (swipeToRefresh != null) { swipeToRefresh.setRefreshing(false); } miniLoader.setVisibility(View.GONE); } }); }

在您的 AuctionsListAdapter 中添加此方法。就是设置Adapter用来显示数据的列表：

public void setModel(List<Today> todayModel) { this.model = todayModel; }

在recyclerView中如何使用LazyLoader和PullToRefresh？

How to use LazyLoader and PullToRefresh in recyclerView?

java

android

lazy-loading

pull-to-refresh

android-recyclerview