如何等待回調有數據？

Question

我正在嘗試使用Retrofit和OkHttp向服務器發出請求。我有下一課「AutomaticRequest.java」，它有一個請求從服務器獲取視頻。

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(); 
      } 
     }); 

    } 
} 

我創建了隔壁班「AutomaticCallback.java」檢索數據。

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

我打電話從片段喜歡下方式請求：

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; 
    } 

    ... 

} 

我怎樣才能等到回調有數據更新UI？謝謝。

Answer 1

只實現你的片段像AutomaticCallback接口：

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 
    } 
}