recyclerview项目显示导航抽屉片段中的空白色屏幕

Question

I am developing news and I have implemented recyclerview with search view in navigation drawer fragment however recyclerview item in navigation drawer showing empty white screen. I am getting two ending point in fragment class and below my root URL.

private static final String ROOT_URL = "https://newsapi.org";

below my first ending point where I am getting top headlines.

 @GET("/v2/top-headlines?sources=bbc-sport&apiKey=my-api-key")
    Call<SportNews> getArticles();

below second ending point where I am getting everything

 @GET("/v2/everything?apiKey=my-api-key")
    Call<Search> getSearchViewArticles(@Query("q") String q);

below BBCSportsFragment class where I have implemented RecyclerView and SearchView

public class BBCSportFragment extends Fragment implements ArticleAdapter.ClickListener {

public static List<Article> articleList = new ArrayList<>();

public static List<Article> origArticleList = new ArrayList<>();

@ActivityContext
public Context activityContext;
Search search;
@ApplicationContext
public Context mContext;

@BindView(R.id.recycler_view)
RecyclerView recyclerView;
BBCSportFragmentComponent bbcSportFragmentComponent;
BBCFragmentContextModule bbcFragmentContextModule;
private SportNews sportNews;
private static ArticleAdapter articleAdapter;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_bbcsport, container, false);
    ButterKnife.bind(this, view);
    SportInterface sportInterface = SportClient.getApiService();
    Call<SportNews> call = sportInterface.getArticles();
    call.enqueue(new Callback<SportNews>() {
        @Override
        public void onResponse(Call<SportNews> call, Response<SportNews> response) {
            if (response == null) {
                sportNews = response.body();
                if (sportNews != null && sportNews.getArticles() != null) {
                    articleList.addAll(sportNews.getArticles());

                }
                articleAdapter = new ArticleAdapter(articleList, sportNews);
                ApplicationComponent applicationComponent;
                applicationComponent = (ApplicationComponent) MyApplication.get(Objects.requireNonNull(getActivity())).getApplicationContext();
                bbcSportFragmentComponent = (BBCSportFragmentComponent) DaggerApplicationComponent.builder().contextModule(new ContextModule(getContext())).build();
                bbcSportFragmentComponent.injectBBCSportFragment(BBCSportFragment.this);
                RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext(applicationComponent));
                recyclerView.setLayoutManager(layoutManager);
                recyclerView.setAdapter(articleAdapter);
            }
        }

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

        }
    });


    SportInterface searchInterface = SportClient.getApiService();
    Call<Search> searchCall = searchInterface.getSearchViewArticles("q");
    searchCall.enqueue(new Callback<Search>() {
        @Override
        public void onResponse(Call<Search> call, Response<Search> response) {
            search = response.body();

            if (search != null && search.getArticles() != null) {
                articleList.addAll(search.getArticles());
                origArticleList.clear();
                origArticleList.addAll(search.getArticles());
            }

            articleAdapter = new ArticleAdapter(articleList, search);
            RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext());
            recyclerView.setLayoutManager(layoutManager);
            recyclerView.setAdapter(articleAdapter);
        }

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

        }
    });


    return view;


}

private Context getContext(ApplicationComponent applicationComponent) {
    return null;
}

public static void doFilter(String searchQuery) {
    searchQuery = searchQuery.toLowerCase();
    articleList.clear();
    for (Article article : origArticleList) {
        final String text = article.getTitle();
        if (text.equals(searchQuery))
            articleList.add(article);
    }
    articleAdapter.notifyDataSetChanged();
}
}

below adapter class

public class ArticleAdapter extends RecyclerView.Adapter<ArticleAdapter.CustomViewHolder> {

public static final String urlKey = "urlKey";
List<Article> articles;

private ClipboardManager myClipboard;
private ClipData myClip;


public ArticleAdapter(List<Article> articles, SportNews sportNews) {
    this.articles = articles;


}

public ArticleAdapter(ClickListener clickListener) {
}

public ArticleAdapter(List<Article> articleList, Search search) {
}

@NonNull
@Override
public ArticleAdapter.CustomViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.article_list, null);
    return new ArticleAdapter.CustomViewHolder(itemView);
}

@Override
public void onBindViewHolder(@NonNull edgar.yodgorbek.sportnews.adapter.ArticleAdapter.CustomViewHolder customViewHolder, int position) {
    Article article = articles.get(position);
    SimpleDateFormat input = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
    SimpleDateFormat output = new SimpleDateFormat("dd/MM/yyyy");

    Date d = new Date();
    try {
        d = input.parse(article.getPublishedAt());
    } catch (ParseException e) {
        e.printStackTrace();
    }


    String formatted = output.format(d);
    customViewHolder.articleTime.setText(formatted);
    customViewHolder.articleAuthor.setText(article.getSource().getName());
    customViewHolder.articleTitle.setText(article.getTitle());
    Picasso.get().load(article.getUrlToImage()).into(customViewHolder.articleImage);
    customViewHolder.itemView.setOnClickListener(v -> {
        Intent intent = new Intent(v.getContext(), DetailActivity.class);

        intent.putExtra("urlKey", article.getUrl());

        v.getContext().startActivity(intent);

    });
    customViewHolder.articleShare.setOnClickListener(v -> {
        Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
        sharingIntent.setType("text/plain");
        String articleDescription = article.getDescription();
        String articleTitle = article.getTitle();
        sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, articleDescription);
        sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, articleTitle);
        v.getContext().startActivity((Intent.createChooser(sharingIntent, "Share using")));


    });

    customViewHolder.articleFavorite.setOnClickListener(v -> {
        myClipboard = (ClipboardManager) v.getContext().getSystemService(Context.CLIPBOARD_SERVICE);


        myClip = ClipData.newPlainText("label", customViewHolder.articleTitle.getText().toString());
        myClipboard.setPrimaryClip(myClip);
        Toast.makeText(v.getContext(), "Copied to clipboard", Toast.LENGTH_SHORT).show();

    });
}


@Override
public int getItemCount() {
    if (articles == null) return 0;
    return articles.size();
}

public interface ClickListener {
}

public class CustomViewHolder extends RecyclerView.ViewHolder {
    @BindView(R.id.articleAuthor)
    TextView articleAuthor;
    @BindView(R.id.articleTitle)
    TextView articleTitle;
    @BindView(R.id.articleImage)
    ImageView articleImage;
    @BindView(R.id.articleTime)
    TextView articleTime;
    @BindView(R.id.articleShare)
    ImageButton articleShare;
    @BindView(R.id.articleFavorite)
    ImageButton articleFavorite;

    public CustomViewHolder(View view) {
        super(view);
        ButterKnife.bind(this, view);


    }
}


}

below main.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_search"
        android:icon="@drawable/ic_search_white"
        android:title="@string/search_hint"
        app:showAsAction="collapseActionView|ifRoom"
        app:actionViewClass="android.support.v7.widget.SearchView" />
</menu>

following screeshot of recyclerview item in navgation drawer fragment

Answer 1

Sorry for late reply, but it seems like you are calling both APIs at once. One for getting all data and another one for getting filtered data which contain some string (Eg In your code you are having "q").

You need to remove below lines from onCreateView of your Fragment. Only call it after click on search icon. And replace the parameter "q" in searchInterface.getSearchViewArticles("q"); with the string value which you will get from the search box.

    SportInterface searchInterface = SportClient.getApiService();
    Call<Search> searchCall = searchInterface.getSearchViewArticles("q");
    searchCall.enqueue(new Callback<Search>() {
        @Override
        public void onResponse(Call<Search> call, Response<Search> response) {
            search = response.body();

            if (search != null && search.getArticles() != null) {
                articleList.clear();
                articleList.addAll(search.getArticles());
            }

            if(articleAdapter != null){
                articleAdapter.notifyDataSetChanged();
            } else {
                articleAdapter = new ArticleAdapter(articleList, search);
                RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext());
                recyclerView.setLayoutManager(layoutManager);
                recyclerView.setAdapter(articleAdapter);
            }
        }

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

        }
    });