使用改造 2.0 解析嵌套 json

Question

我有这个 json，我想使用改造来解析它们。

{
  "status": "true",
  "data": [
{
  "id": "1",
  "title": "Hi :)",
  "text": "<p>121212</p>",
  "cat_id": "1",
  "username": "admin",
  "coin": "0",
  "datetime": "1451508880",
  "isShow": "1"
},
{
  "id": "3",
  "title": " Hi :)",
  "text": "Hi :)",
  "cat_id": "2",
  "username": "Hi :)",
  "coin": "20",
  "datetime": "1451508880",
  "isShow": "1"
},
{
  "id": "4",
  "title": "a",
  "text": "someText",
  "cat_id": "1",
  "username": "admin",
  "coin": "10",
  "datetime": "1451982292",
  "isShow": "1"
}
  ]
}

当 json 处于数组模式时，我的代码可以正常工作。但我的问题是如何像上面的示例一样解析嵌套 json?

这里是我的 javaClass: (statusClass)

public class retroStatus {

@SerializedName("status")
private String status;

@SerializedName("data")
private ArrayList<retroPost> data;

  //getters And Setters
}

(retroPost Class)

public class retroPost {

@SerializedName("id")
private int id;

@SerializedName("title")
private String title;

@SerializedName("text")
private String text;

@SerializedName("cat_id")
private int cat_id;

@SerializedName("datetime")
private long datetime;


 //getters And Setters
}

(getPostInterface)

public interface getPost {
@GET("get/posts/all")
Call<List<retroStatus>> getPost();
}

（和主代码）

  Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("http://mywebsite.it/api/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    getPost postService = retrofit.create(getPost.class);
    Call<List<retroStatus>> call = postService.getPost();
    Callback<List<retroStatus>> callback = new Callback<List<retroStatus>>() {
        @Override
        public void onResponse(Response<List<retroStatus>> response, Retrofit retrofit) {
            if (response.isSuccess()) {
                for (retroStatus status : response.body()) {
                    Log.e("test", "nowStatusIs: " + status.getStatus());
                }
            } else {
                Log.e("test", "Failed");
            }


        }

        @Override
        public void onFailure(Throwable t) {
            Log.e("test", "onFailure");
        }
    };
    call.enqueue(callback);

现在当运行应用程序时，onFailure 发生了，但是如果主要 json 只是在一个 json 数组中并且只使用 retroPost 来解析那工作非常好......我错误？
抱歉英语不好...

Answer 1

我看到很多人都面临这个问题，所以我 post 用我自己的方式 Retrofit 这是我所做的，它是如此简单和干净：

创建 ServiceHelper Class :

public class ServiceHelper {

private static final String ENDPOINT = "http://test.com";

private static OkHttpClient httpClient = new OkHttpClient();
private static ServiceHelper instance = new ServiceHelper();
private IPlusService service;


private ServiceHelper() {

    Retrofit retrofit = createAdapter().build();
    service = retrofit.create(IPlusService.class);
}

public static ServiceHelper getInstance() {
    return instance;
}

private Retrofit.Builder createAdapter() {

    httpClient.setReadTimeout(60, TimeUnit.SECONDS);
    httpClient.setConnectTimeout(60, TimeUnit.SECONDS);
    HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
    interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    httpClient.interceptors().add(interceptor);

    return new Retrofit.Builder()
            .baseUrl(ENDPOINT)
            .client(httpClient)
            .addConverterFactory(GsonConverterFactory.create());
}

public Call<List<CategoryModel>> getAllCategory() {
    return service.getAllCategory();
}

}

然后创建您的服务 class 在我的案例中它是 IPlusService

    public interface IPlusService {

    @GET("/api/category")
    Call<List<CategoryModel>> getAllCategory();
}

现在在您的 Fragment/Activity class 中，您可以使用类似这样的方式调用您自己的方法：

ServiceHelper.getInstance().getAllCategory().enqueue(new Callback<List<CategoryModel>>() {
        @Override
        public void onResponse(Response<List<CategoryModel>> response, Retrofit retrofit) {
            processResponse(response);
        }

        @Override
        public void onFailure(Throwable t) {
            processResponse(null);
        }
    });

同时将以下依赖项添加到您的 gradle :

dependencies {

      compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'
    compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'
    compile 'com.squareup.okhttp:logging-interceptor:2.6.0'

}

Answer 2

你的json的根节点不是数组，但是你在接口getPost上声明为List<responseStatus>。所以你需要使用 responseStatus 而不是当前的。并使用 gettter 访问 data

@SerializedName("data")
private ArrayList<retroPost> data;

这是数组

使用改造 2.0 解析嵌套 json

Parse a nested json with retrofit 2.0

android

json

gson

retrofit