Question

我有问题，为什么没有人帮助我？

在我的应用程序中，我想要加载数据并使用延迟加载程序作为recyclerView。
我在下面写下了加载数据的代码：

private void loadNews() {
    NewsSendData sendData = new NewsSendData();
    sendData.setKey("");

    newsPageImageProgress.show();

    InterfaceApi api = ApiClient.getClient().create(InterfaceApi.class);
    Call<NewsResponse> call = api.getMainNews(sendData);

    call.enqueue(new Callback<NewsResponse>() {
        @Override
        public void onResponse(Call<NewsResponse> call, Response<NewsResponse> response) {
            if (response.body().getData().getNewsDatum() != null) {
                newModel.clear();
                newModel.addAll(response.body().getData().getNewsDatum());
                newsAdapter.notifyDataSetChanged();
                newsPageRecyclerView.setAdapter(newsAdapter);
            }
        }

        @Override
        public void onFailure(Call<NewsResponse> call, Throwable t) {
    });

并在recyclerView的延迟加载程序中编写以下代码：

newsPageRecyclerView.setOnScrollListener(new EndlessRecyclerOnScrollListener(layoutManager) {
                @Override
                public void onLoadMore(int current_page) {
                    NewsSendData sendData = new NewsSendData();
                    sendData.setKey("");

                    InterfaceApi api = ApiClient.getClient().create(InterfaceApi.class);
                    Call<NewsResponse> call = api.getMainNews(sendData);

                    call.enqueue(new Callback<NewsResponse>() {
                        @Override
                        public void onResponse(Call<NewsResponse> call, Response<NewsResponse> response) {
                            if (response.body().getData().getNewsDatum() != null) {
                                newsAdapter.addNewItem(response.body().getData().getNewsDatum());
                                newsPageLoadLay.setVisibility(View.GONE);
                            }
                        }

                        @Override
                        public void onFailure(Call<NewsResponse> call, Throwable t) {
                        }
                    });
                }
            });

我应该在我的应用程序中使用 searchView ，我希望当用户搜索文本时，删除以前的数据，只显示来自服务器的新数据（来自服务器的搜索结果）。
对于搜索结果，请使用以下代码：

newsSearchView.setOnQueryTextListener(new MaterialSearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(final String query) {

                NewsSendData sendData = new NewsSendData();
                sendData.setKey(query);

                InterfaceApi api = ApiClient.getClient().create(InterfaceApi.class);
                Call<NewsResponse> call = api.getMainNews(sendData);

                call.enqueue(new Callback<NewsResponse>() {
                    @Override
                    public void onResponse(Call<NewsResponse> call, Response<NewsResponse> response) {
                        if (response.body().getData().getNewsDatum() != null) {
                            newModel.clear();
                            newModel.addAll(response.body().getData().getNewsDatum());
                            newsAdapter.notifyDataSetChanged();
                            newsPageRecyclerView.setAdapter(newsAdapter);
                            newsPageImageProgress.hide();

                            toolbarTitleTxt.setText(query);
                        }
                    }

                    @Override
                    public void onFailure(Call<NewsResponse> call, Throwable t) {
                });

我在活动的 onCreate（）上写了上面的代码使用上述代码时，请向我显示来自服务器的大量数据。

例如：我在搜索文本时，在 PostMan 中显示2个数据，但在我的应用程序中显示数据的这2个数据顶部并显示此下面的其他数据2数据。

当删除延迟加载程序代码时，我的问题是修复并只显示这2个数据，但是当再次添加延迟加载程序时显示其他数据!!!

我该如何修复这个错误？请帮帮我

Answer 1

将EndlessRecyclerOnScrollListener代码替换为以下代码。

public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener { 
public static String TAG = EndlessRecyclerOnScrollListener.class.getSimpleName(); 
int firstVisibleItem, visibleItemCount, totalItemCount; 
private int previousTotal = 0; // The total number of items in the dataset after the last load 
private boolean loading = true; // True if we are still waiting for the last set of data to load. 
private int visibleThreshold = 4; // The minimum amount of items to have below your current scroll position before loading more. 
private int current_page = 1; 

private StaggeredGridLayoutManager mGridLayoutManager; 

public EndlessRecyclerOnScrollListener(StaggeredGridLayoutManager gridLayoutManager) { 
    this.mGridLayoutManager = gridLayoutManager; 
} 

@Override 
public void onScrolled(RecyclerView recyclerView, int dx, int dy) { 
    super.onScrolled(recyclerView, dx, dy); 

    visibleItemCount = recyclerView.getChildCount(); 
    totalItemCount = mGridLayoutManager.getItemCount(); 
    int[] items = new int[3]; 
    mGridLayoutManager.findFirstVisibleItemPositions(items); 
    firstVisibleItem = items[0]; 

    if (loading) { 
        if (totalItemCount > previousTotal) { 
            loading = false; 
            previousTotal = totalItemCount; 
        } 
    } 
    if (!loading && (totalItemCount - visibleItemCount) 
            <= (firstVisibleItem + visibleThreshold)) { 
        // End has been reached 

        // Do something 
        current_page++; 

        onLoadMore(current_page); 

        loading = true; 
    } 
} 

public abstract void onLoadMore(int current_page);

}

如何将数据从服务器加载到Android上的RecyclerView

1 个答案: