Retrofit Returning Null Response Body

Question

Я пытаюсь сделать вызов API FlickR, и у меня возникают трудности, так как response.body() возвращает null.

Я не уверен, относится ли это к моему сопоставлению JSON/POJO, но я не могу понять, как получить доступ к отклику от «Дооснащения», когда я делаю звонок FlickR. Я знаю, что мой звонок завершается успешно, поскольку я действительно могу просматривать JSON через регистрационный перехватчик.

Модель:

public class Model { 

Photos photos; 
int code; 
String stat; 
String message; // when you text = null 

public class Photos { 

    @SerializedName("page") 
    @Expose 
    private int page; 
    @SerializedName("pages") 
    @Expose 
    private int pages; 
    @SerializedName("perpage") 
    @Expose 
    private int perpage; 
    @SerializedName("total") 
    @Expose 
    private String total; 
    @SerializedName("photo") 
    @Expose 
    private List<Photo> photo = new ArrayList<Photo>(); 

    /** 
    * @return The page 
    */ 
    public int getPage() { 
     return page; 
    } 

    /** 
    * @param page The page 
    */ 
    public void setPage(int page) { 
     this.page = page; 
    } 

    /** 
    * @return The pages 
    */ 
    public int getPages() { 
     return pages; 
    } 

    /** 
    * @param pages The pages 
    */ 
    public void setPages(int pages) { 
     this.pages = pages; 
    } 

    /** 
    * @return The perpage 
    */ 
    public int getPerpage() { 
     return perpage; 
    } 

    /** 
    * @param perpage The perpage 
    */ 
    public void setPerpage(int perpage) { 
     this.perpage = perpage; 
    } 

    /** 
    * @return The total 
    */ 
    public String getTotal() { 
     return total; 
    } 

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

    /** 
    * @return The photo 
    */ 
    public List<Photo> getPhoto() { 
     return photo; 
    } 

    /** 
    * @param photo The photo 
    */ 
    public void setPhoto(List<Photo> photo) { 
     this.photo = photo; 
    } 

} 

public class Photo { 

    @SerializedName("id") 
    @Expose 
    private String id; 
    @SerializedName("owner") 
    @Expose 
    private String owner; 
    @SerializedName("secret") 
    @Expose 
    private String secret; 
    @SerializedName("server") 
    @Expose 
    private String server; 
    @SerializedName("farm") 
    @Expose 
    private int farm; 
    @SerializedName("title") 
    @Expose 
    private String title; 
    @SerializedName("ispublic") 
    @Expose 
    private int ispublic; 
    @SerializedName("isfriend") 
    @Expose 
    private int isfriend; 
    @SerializedName("isfamily") 
    @Expose 
    private int isfamily; 
    @SerializedName("url_m") 
    @Expose 
    private String urlM; 
    @SerializedName("height_m") 
    @Expose 
    private String heightM; 
    @SerializedName("width_m") 
    @Expose 
    private String widthM; 

    public Photo(){ 

    } 

    /** 
    * @return The id 
    */ 
    public String getId() { 
     return id; 
    } 

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

    /** 
    * @return The owner 
    */ 
    public String getOwner() { 
     return owner; 
    } 

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

    /** 
    * @return The secret 
    */ 
    public String getSecret() { 
     return secret; 
    } 

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

    /** 
    * @return The server 
    */ 
    public String getServer() { 
     return server; 
    } 

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

    /** 
    * @return The farm 
    */ 
    public int getFarm() { 
     return farm; 
    } 

    /** 
    * @param farm The farm 
    */ 
    public void setFarm(int farm) { 
     this.farm = farm; 
    } 

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

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

    /** 
    * @return The ispublic 
    */ 
    public int getIspublic() { 
     return ispublic; 
    } 

    /** 
    * @param ispublic The ispublic 
    */ 
    public void setIspublic(int ispublic) { 
     this.ispublic = ispublic; 
    } 

    /** 
    * @return The isfriend 
    */ 
    public int getIsfriend() { 
     return isfriend; 
    } 

    /** 
    * @param isfriend The isfriend 
    */ 
    public void setIsfriend(int isfriend) { 
     this.isfriend = isfriend; 
    } 

    /** 
    * @return The isfamily 
    */ 
    public int getIsfamily() { 
     return isfamily; 
    } 

    /** 
    * @param isfamily The isfamily 
    */ 
    public void setIsfamily(int isfamily) { 
     this.isfamily = isfamily; 
    } 

    /** 
    * @return The urlM 
    */ 
    public String getUrlM() { 
     return urlM; 
    } 

    /** 
    * @param urlM The url_m 
    */ 
    public void setUrlM(String urlM) { 
     this.urlM = urlM; 
    } 

    /** 
    * @return The heightM 
    */ 
    public String getHeightM() { 
     return heightM; 
    } 

    /** 
    * @param heightM The height_m 
    */ 
    public void setHeightM(String heightM) { 
     this.heightM = heightM; 
    } 

    /** 
    * @return The widthM 
    */ 
    public String getWidthM() { 
     return widthM; 
    } 

    /** 
    * @param widthM The width_m 
    */ 
    public void setWidthM(String widthM) { 
     this.widthM = widthM; 
    } 

    } 

} 

JSON ответ:

{ 
    photos: { 
    page: 1, 
    pages: 3683, 
    perpage: 100, 
    total: "368270", 
    photo: [ 
     { 
     id: "29264707352", 
     owner: "84316756@N02", 
     secret: "9ed355a86e", 
     server: "8603", 
     farm: 9, 
     title: "Tercer Patio de los Claustros de la Compañía/ Arequipa", 
     ispublic: 1, 
     isfriend: 0, 
     isfamily: 0, 
     url_m:   "https://farm9.staticflickr.com/8603/29264707352_9ed355a86e.jpg", 
     height_m: "500", 
     width_m: "333" 
      }, 
     { 
     id: "29339070436", 
     owner: "146617764@N02", 
     secret: "b52f1e9914", 
     server: "8509", 
     farm: 9, 
     title: "2016-04-17 09.24.07", 
     ispublic: 1, 
     isfriend: 0, 
     isfamily: 0, 
     url_m: "https://farm9.staticflickr.com/8509/29339070436_b52f1e9914.jpg", 
     height_m: "281", 
     width_m: "500" 
     }, 

LogCat

09-03 15:11:33.037 1846-1846/com.troychuinard.flickr_test E/AndroidRuntime: FATAL EXCEPTION: main 
                      Process: com.troychuinard.flickr_test, PID: 1846 
                      java.lang.NullPointerException: println needs a message 
                       at android.util.Log.println_native(Native Method) 
                       at android.util.Log.v(Log.java:118) 
                       at com.troychuinard.flickr_test.MainActivity$1$1.onResponse(MainActivity.java:72) 
                       at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68) 
                       at android.os.Handler.handleCallback(Handler.java:739) 
                       at android.os.Handler.dispatchMessage(Handler.java:95) 
                       at android.os.Looper.loop(Looper.java:135) 
                       at android.app.ActivityThread.main(ActivityThread.java:5254) 
                       at java.lang.reflect.Method.invoke(Native Method) 
                       at java.lang.reflect.Method.invoke(Method.java:372) 
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
09-03 15:14:21.858 1846-1846/com.troychuinard.flickr_test I/Process: Sending signal. PID: 1846 SIG: 9 

Линия 72

  Log.v("RESPONSE_BODY", response.body().getTotal()); 

активность

public class MainActivity extends AppCompatActivity { 

private EditText mSearchTerm; 
private Button mRequestButton; 
private Button mSearchButton; 
private String mQuery; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    mSearchTerm = (EditText) findViewById(R.id.ediText_search_term); 
    mRequestButton = (Button) findViewById(R.id.request_button); 
    mSearchButton = (Button) findViewById(R.id.search_button_flickr); 
    mRequestButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      mQuery = mSearchTerm.getText().toString(); 
      HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(); 
      interceptor.setLevel(HttpLoggingInterceptor.Level.BODY); 
      OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build(); 
      Retrofit retrofit = new Retrofit.Builder() 
        .baseUrl("https://api.flickr.com/services/rest/") 
        .client(client) 
        .addConverterFactory(GsonConverterFactory.create()) 
        .build(); 


      ApiInterface apiInterface = retrofit.create(ApiInterface.class); 
      Call<Photos> call = apiInterface.getImages(mQuery); 
      call.enqueue(new Callback<Photos>() { 
       @Override 
       public void onResponse(Call<Photos> call, Response<Photos> response) { 
        Log.v("RESPONSE_CALLED", "ON_RESPONSE_CALLED"); 
        String didItWork = String.valueOf(response.isSuccessful()); 
        Log.v("SUCCESS?", didItWork); 
        Log.v("RESPONSE_CODE", String.valueOf(response.code())); 
        Photos photos = response.body(); 
        Log.v("RESPONSE_BODY", "response:" + photos); 
        String total = response.body().getTotal(); 
        Log.v("Total", total); 
        List<Photos.Photo> photoResults = response.body().getPhoto(); 
        for (Photos.Photo photo : photoResults) { 
         Log.v("PHOTO_URL:", photo.getTitle() 
         ); 
        } 


       } 

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

       } 
      }); 
     } 
    }); 

    mSearchButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent toSearch = new Intent(MainActivity.this, FlickRActivity.class); 
      startActivity(toSearch); 
     } 
    }); 


} 

//Synchronous vs. Asynchronous 
public interface ApiInterface { 

    @GET("?method=flickr.photos.search&api_key=1c448390199c03a6f2d436c40defd90e&format=json&nojsoncallback=1&extras=url_m") 
    Call<Photos> getImages(@Query("text") String query); 

} 

}

Answer 1

Исходя из моего предыдущего ответа here ваша модель не исправить ваш stat: "ok" в конце ответ ваша ошибка.

В то время как вы создаете Photos объект вам нужна родительская модель, чтобы сохранить как атрибут (photos & stat)

Так что ваша модель будет:

public class Model { 

    Photos photos; 
    int code; 
    String stat; 
    String message; // when you text = null 


    public class Photos{ 
     int page; 
     int pages; 
     int perpage; 
     int total; 
     List<Photo> photo; 



     public class Photo{ 
      String id; 
      String owner; 
      String secret; 
      //rest of things 

     } 
    } 
} 

Также не забудьте изменить Call<Photos> до Call<Model>.