Question

我在使用Retrofit时遇到困难，因为我试图理解我应该在返回的response.body()中看到的内容。

我认为我的JSON到POJO转换中存在映射错误，因为当我将其打印到日志时，我没有看到正确的响应。

以下是我看到的回复：

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

我希望这个响应只是JSON数据。我知道我正在调用FlickR，因为我正在使用日志拦截器来查看JSON：

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

型号：

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响应：

{
  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的

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

第72行

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

活动

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

我认为我的JSON到POJO转换存在映射错误 是的，你是对的，你有JSON到POJO转换的问题。我已根据您的Json Response

创建了POJO

主要或根类，我命名为“ Flicker ”，然后“ Flicker ”类包含“照片”类的另一个属性，和“照片”包含类照片

的对象列表

以下是课程，

<强> 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;
    }

}

<强> 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;
    }

}

<强> Photo.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;
    }

}

我以不同方式创建了Retrofit客户端，这就是我所做的，在onClick代码方法中

 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) {

            }
        });

我在gradle中添加了以下依赖项

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

一切正常。希望能帮助到你。如果您的问题得到解决，请告诉我

解析改造response.body（）

1 个答案: