从 retrofit onResponse android 在 AsyncLoader 中的队列之外返回值

Question

How to return value from enqueue function to LoadinBackground() listnews is returning as null

public class NewsAppLoader extends AsyncTaskLoader<ArrayList> {

private static final String USGS_REQUEST_URL =
        "https://newsapi.org/v2/everything?q=tesla&from=2021-04-18&sortBy=publishedAt&apiKey=47ebcd70505c4649b04dd050c8bbe307";
private static final String BASE_URL =
        "https://newsapi.org/v2/";
private static final String LOG_TAG = "check";
final String API_KEY = "47ebcd70505c4649b04dd050c8bbe307";

public NewsAppLoader(Context context) {
    super(context);
    //this.apiClient = apiClient;
}

NewsAppAdapter newsAdapter;
Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .build();

APIInterface api = retrofit.create(APIInterface.class);
Call<ResponseModel> call = api.getLatestNews("Tesla", API_KEY);

// @Nullable
@SuppressLint("LongLogTag")
@Override
public ArrayList<News> loadInBackground() {

    ArrayList<News> listNews = new ArrayList<News>();


    call.enqueue(new Callback<ResponseModel>() {
        @Override
        public void onResponse(Call<ResponseModel> call, Response<ResponseModel> response) {

            if (response.body().getStatus().equals("ok")) {

                List<Article> articleList = response.body().getArticles();
                if (articleList.size() > 0) {
                    String title = articleList.get(0).getTitle();
                    String desc = articleList.get(0).getDescription();
                    String author = articleList.get(0).getAuthor();
                    String imgURL = articleList.get(0).getUrlToImage();

                    listNews.add(new News(title, null, desc, author));
                    // return new ArrayList<News>(listNews);
                    //getNewsList(listNews);

                }
            }


            //return articleList;
        }

        @Override
        public void onFailure(Call<ResponseModel> call, Throwable t) {
            Log.e("out", t.toString());
        }
    });


    return listNews;
}

// listNews = callRetrofit(call);

//return listNews;


public ArrayList<News> getNewsList(ArrayList<News> news) {
    return news;
}

}

please suggest any method to return value from OnResponse to LoadinBackground(). So that I can load that values in List View adapter.

Answer 1

You can use call.execute to get response synchronously. But AsyncTask is not mandatory at all, you can use your current code without AsyncTask. Actually, Retrofit executes HTTP requests in background when you use call.enqueue , so you can easily use it without AsyncTask