構文解析Retailfit response.body（）

Question

返されるresponse.body（）に何が期待されるかを理解しようとしているので、RetroFitに問題があります。

JSONからPOJOへの変換にマッピングエラーがあります。これは、ログに出力するときに正しい応答が表示されないためです。ここで

は、私が見ています応答である：

V/RESPONSE_BODY: response:com.troychuinard.flickr_test.Model.Model@36b2e4c9 

私はこの応答は、単純にJSONデータであることを期待します。私はJSONを見るためにログインターセプタを使用していますように私は、私はFlickrに正しいコールを作っています知っている：

https://api.flickr.com/services/rest/?method=flickr.photos.getRecent&api_key=1c448390199c03a6f2d436c40defd90e&format=json&nojsoncallback=1&extras=url_m&text=test 

モデル：

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応答：

{ 
    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 

ライン72

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

活動

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

私はPOJOへの変換、私のJSONにマッピングエラーを持っていると思う はい、あなたはJSONからPOJOへの変換に問題があります。私はあなたのJSONレスポンス

メインまたはルートクラスに基づいてPOJOを作成して、私は「フリッカー」、そして「フリッカー」クラスは「写真」クラスの別のプロパティが含まれており、「写真」と命名しましたクラスのオブジェクトのリストが含まれてい写真はここ

は

Flicker.javaクラス、

です

public class Flicker { private Photos photos; private String stat; public Photos getPhotos() { return photos; } public void setPhotos(Photos photos) { this.photos = photos; } public String getStat() { return stat; } public void setStat(String stat) { this.stat = stat; } } 

Photos.java

public class Photos { 

    private Integer page; 
    private Integer pages; 
    private Integer perpage; 
    private Integer total; 
    private List<Photo> photo = new ArrayList<Photo>(); 

    public Integer getPage() { 
     return page; 
    } 

    public void setPage(Integer page) { 
     this.page = page; 
    } 


    public Integer getPages() { 
     return pages; 
    } 

    public void setPages(Integer pages) { 
     this.pages = pages; 
    } 


    public Integer getPerpage() { 
     return perpage; 
    } 


    public void setPerpage(Integer perpage) { 
     this.perpage = perpage; 
    } 

    public Integer getTotal() { 
     return total; 
    } 

    public void setTotal(Integer total) { 
     this.total = total; 
    } 


    public List<Photo> getPhoto() { 
     return photo; 
    } 

    public void setPhoto(List<Photo> photo) { 
     this.photo = photo; 
    } 

} 

写真。Javaの

public class Photo { 

    private String id; 
    private String owner; 
    private String secret; 
    private String server; 
    private Integer farm; 
    private String title; 
    private Integer ispublic; 
    private Integer isfriend; 
    private Integer isfamily; 
    private String url_m; 
    private String height_m; 
    private String width_m; 

    public String getId() { 
     return id; 
    } 

    public void setId(String id) { 
     this.id = id; 
    } 

    public String getOwner() { 
     return owner; 
    } 

    public void setOwner(String owner) { 
     this.owner = owner; 
    } 

    public String getSecret() { 
     return secret; 
    } 

    public void setSecret(String secret) { 
     this.secret = secret; 
    } 


    public String getServer() { 
     return server; 
    } 


    public void setServer(String server) { 
     this.server = server; 
    } 

    public Integer getFarm() { 
     return farm; 
    } 

    public void setFarm(Integer farm) { 
     this.farm = farm; 
    } 

    public String getTitle() { 
     return title; 
    } 


    public void setTitle(String title) { 
     this.title = title; 
    } 
    public Integer getIspublic() { 
     return ispublic; 
    } 


    public void setIspublic(Integer ispublic) { 
     this.ispublic = ispublic; 
    } 


    public Integer getIsfriend() { 
     return isfriend; 
    } 

    public void setIsfriend(Integer isfriend) { 
     this.isfriend = isfriend; 
    } 


    public Integer getIsfamily() { 
     return isfamily; 
    } 


    public void setIsfamily(Integer isfamily) { 
     this.isfamily = isfamily; 
    } 


    public String getUrl_m() { 
     return url_m; 
    } 

    public void setUrl_m(String url_m) { 
     this.url_m = url_m; 
    } 


    public String getHeight_m() { 
     return height_m; 
    } 


    public void setHeight_m(String height_m) { 
     this.height_m = height_m; 
    } 


    public String getWidth_m() { 
     return width_m; 
    } 


    public void setWidth_m(String width_m) { 
     this.width_m = width_m; 
    } 

} 

そして、私は違ったレトロフィットクライアントを作成している、これは私がコード

mQuery = mSearchTerm.getText().toString(); 
Retrofit retrofit = new Retrofit.Builder() 
       .baseUrl("https://api.flickr.com/services/rest/") 
       .addConverterFactory(GsonConverterFactory.create()) 
       .build(); 

     ApiInterface apiInterface = retrofit.create(ApiInterface.class); 
     Call<Flicker> call = apiInterface.getImages(mQuery); 

     call.enqueue(new Callback<Flicker>() { 
      @Override 
      public void onResponse(Call<Flicker> call, Response<Flicker> 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())); 
       Flicker flicker_photos = response.body(); 
       Log.v("RESPONSE_BODY", "response:" + flicker_photos); 
       String total = response.body().getPhotos().getTotal().toString(); 
       Log.v("Total", total); 
       List<Photo> photoResults = response.body().getPhotos().getPhoto(); 
       for (Photo photo : photoResults) { 
        Log.v("PHOTO_URL:", photo.getTitle() 
        ); 
       } 

      } 

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

      } 
     }); 

ののonClickメソッド内で、行われていると私は私のGradle

compile 'com.squareup.retrofit2:retrofit:2.1.0' 
compile 'com.squareup.retrofit2:converter-gson:2.1.0' 

に次の依存関係を追加したものです

すべて動作しています。それが役に立てば幸い 。あなたの問題が修正された場合に教えてください