改造，onResponse 方法不起作用

Question

我是 Retrofit 的新手，尝试从一个 Web 服务器获取数据，创建模型，接口，但这仍然不是 working.Problem（可能）在方法 onResponse() 中我添加到该方法 Log.d和 Toast，但在启动我的 app.Why 时我没有看到 Log 和 Toast，它不起作用？当我得到错误的响应或其他问题时我能理解，但是 onResponse() 通常不起作用，我 think.Maybe Toast 没有数据就不能工作，但是 Log.d 没有它就必须工作，并且 Log.d 没有数据，只有响应代码。我添加了所有依赖项并像在所有教程中一样尝试这样做，我做错了什么以及我可以做些什么来解决这个问题？而且我尝试将此数据放入适配器，但是当启动应用程序时，我在日志 "RecyclerView: No adapter attached; skipping layout" 中有错误可能是相同的 problem.onResponse 不工作并且适配器没有创建，因为适配器在 onResponse 方法中初始化如果 onResponse 不起作用，recyclerview 的 setadapter 不起作用 to.And VideoApi class:

public interface VideoApi {

    @GET("/videos/featured")
    Call<List<Video>>getFeaturedVideo();
}

视频class：

public class Video {

    @SerializedName("url")
    @Expose
    private String url;
    @SerializedName("title")
    @Expose
    private String title;
    @SerializedName("description")
    @Expose
    private String description;
    @SerializedName("score")
    @Expose
    private Integer score;

    /**
     *
     * @return
     * The url
     */
    public String getUrl() {
        return url;
    }

    /**
     *
     * @param url
     * The url
     */
    public void setUrl(String url) {
        this.url = url;
    }

    /**
     *
     * @return
     * The title
     */
    public String getTitle() {
        return title;
    }

    /**
     *
     * @param title
     * The title
     */
    public void setTitle(String title) {
        this.title = title;
    }

    /**
     *
     * @return
     * The description
     */
    public String getDescription() {
        return description;
    }

    /**
     *
     * @param description
     * The description
     */
    public void setDescription(String description) {
        this.description = description;
    }

    /**
     *
     * @return
     * The score
     */
    public Integer getScore() {
        return score;
    }

    /**
     *
     * @param score
     * The score
     */
    public void setScore(Integer score) {
        this.score = score;
    }

}

精选片段：

public class FeaturedFragment extends Fragment {
    RecyclerViewAdapter recyclerViewAdapter;
    public static final String ROOT_URL = "https://api.vid.me/";
    public List <Video> videos;
    RecyclerView recList;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_featured, container, false);
        recList = (RecyclerView) rootView.findViewById(R.id.cardList);
        recList.setHasFixedSize(true);
        LinearLayoutManager llm = new LinearLayoutManager(getActivity());
        llm.setOrientation(LinearLayoutManager.VERTICAL);
        recList.setLayoutManager(llm);
        try {
            getVideos();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return rootView;
    }

    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

    }

    private void getVideos() throws IOException {
        Retrofit retrofitAdapter = new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())
                .baseUrl(ROOT_URL)
                .build();
        final VideoApi videoApi = retrofitAdapter.create(VideoApi.class);
Call<List<Video>> call = videoApi.getFeaturedVideo();
        call.enqueue(new Callback<List<Video>>() {
            @Override
            public void onResponse(Call<List<Video>> call, Response<List<Video>> response) {
                Log.d("MainActivity", "Status Code = " + response.code());
                videos.addAll(response.body());
                recyclerViewAdapter = new RecyclerViewAdapter(videos);
                String result = response.body().get(0).getTitle();
                Toast.makeText(getActivity(), result, Toast.LENGTH_SHORT).show();
                recList.setAdapter(recyclerViewAdapter);
            }

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

            }
        });

    }
}

Answer 1

您的 json 响应 returns Video 对象数组。将 Call 对象中的 List<Video> 更改为 Videos 其中 Videosclass 被定义为 -

public class Videos {
    List<Video> videos;
}

改成这样-

Call<Videos> call = videoApi.getFeaturedVideo();
        call.enqueue(new Callback<Videos>() {
            @Override
            public void onResponse(Call<Videos> call, Response<Videos> response) {
                Log.d("MainActivity", "Status Code = " + response.code());
                videos = response.body().videos;
                recyclerViewAdapter = new RecyclerViewAdapter(videos);                   
                recList.setAdapter(recyclerViewAdapter);
            }

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

            }
        });

    }

此外，更改 -

@GET("/videos/featured")
Call<Videos>getFeaturedVideo();

改造，onResponse 方法不起作用

Retrofit,onResponse method doesnt work

android

retrofit

android-recyclerview

retrofit2