Parsing Retrofit response.body()

Question

Ich habe Schwierigkeiten mit RetroFit, wie ich versuche zu verstehen, was ich in der response.body() erwarten sollte, die zurückgegeben wird.

Ich denke, ich habe einen Mapping-Fehler in meiner JSON zu POJO-Konvertierung, weil ich nicht die richtige Antwort sehe, wenn ich es in das Protokoll drucken. Hier

ist die Antwort, die ich zu sehen bin:

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

Ich würde diese Antwort erwarten, einfach die JSON-Daten sein. Ich weiß, dass ich den richtigen Anruf FlickR machen, wie ich das Logging Interceptor bin mit dem JSON zu sehen:

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

Modell:

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 Antwort:

{ 
    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 

Linie 72

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

Aktivität

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

Ich glaube, ich habe ein Mapping-Fehler in meinem JSON POJO Umwandlung Ja, Sie haben Recht, Sie haben Probleme mit der Konvertierung von JSON in POJO. Ich habe die POJO erstellt basierend auf Ihrer Json Antwort

Die Haupt- oder Wurzelklasse, genannt I „Flicker“, dann „Flicker“ Klasse enthält eine andere Eigenschaft der Klasse „Fotos“ und „Fotos“ enthält eine Liste des Objekts der Klasse Foto

Hier sind die Klassen,

Flicker.java

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; 
    } 

} 

Foto.java

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; 
    } 

} 

Und ich habe anders erstellt Retrofit-Client, das ist, was ich habe innerhalb onClick Methode des Code getan,

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) { 

      } 
     }); 

Und ich habe die folgenden Abhängigkeiten in meinem gradle

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

hinzugefügt

Alles funktioniert. Ich hoffe es hilft . Lassen Sie mich, wenn Ihr Problem behoben ist oder nicht