如何等到Callback有数据？

Question

我正在尝试使用 Retrofit 和 OkHttp 向服务器发出请求。我有下一个 class "AutomaticRequest.java"，它请求从服务器获取视频。

public class AutomaticRequest {

    public void getVideos(final AutomaticCallback callback){

        MediaproApiInterface service = ApiClient.getClient();
        Call<List<AutomaticVideo>> call = service.getAllVideos();
        call.enqueue(new Callback<List<AutomaticVideo>>() {

            @Override
            public void onResponse(Call<List<AutomaticVideo>> call, Response<List<AutomaticVideo>> response) {
                List<AutomaticVideo> automaticVideoList = response.body();
                callback.onSuccessGettingVideos(automaticVideoList);

            }

            @Override
            public void onFailure(Call<List<AutomaticVideo>> call, Throwable t) {
                callback.onError();
            }
        });

    }
}

我创建了下一个 class "AutomaticCallback.java" 来检索数据。

public interface AutomaticCallback {
    void onSuccessGettingVideos(List<AutomaticVideo> automaticVideoList);
    void onError();
}

我正在从一个片段调用请求，如下一种方式：

public class AllVideosFragment extends Fragment {

    ...
    AutomaticCallback callback;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_allvideos, container, false);

        new AutomaticRequest().getVideos(callback);

        return view;
    }

    ...

}

我如何才能等到回调有数据更新 UI？谢谢。

Answer 1

只需在您的片段上实现 AutomaticCallback 接口，例如：

    public class AllVideosFragment extends Fragment implements AutomaticCallback {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_allvideos, container, false);

        new AutomaticRequest().getVideos(this);

        return view;
    }

    @Override
    void onSuccessGettingVideos(List<AutomaticVideo> automaticVideoList){
       // use your data here
    }

    @Override
    void onError(){
      // handle the error
    }
}

如何等到Callback有数据？

How to wait until Callback has data?

android

callback

retrofit2

okhttp3