改装2.0.0 beta2：预期begin_array但begin_object

Question

我每次都会收到这个错误：预期的begin_数组，但它是begin_对象。我不知道我是否需要添加反序列化程序或warrper类来进行改造，但我不知道如何以简单的方式来满足我所有项目的api json响应，下面是我的改造代码：

-

我的Json：

{
  categoryDetails: [

    {
      id: "1",
      categoryName: "Fashion"
    },
    {
      id: "2",
      categoryName: "Pets"
    },
    {
      id: "3",
      categoryName: "Sports"
    },
    {
      id: "4",
      categoryName: "Autre1"
    },
    {
      id: "5",
      categoryName: "Autre2"
    }
  ]
}

我的源代码

import java.util.List;
import java.io.IOException;
import java.util.List;
import android.util.Log;
import retrofit.Call;
import retrofit.GsonConverterFactory;
import retrofit.Retrofit;
import retrofit.http.GET;
import retrofit.http.Path;

public class GitHubClient {

     public static final String API_URL = "http://192.168.1.22";


      public static class Category {
        public final String categoryName;
        public final int id;

        public Category(String categoryName, int id) {
          this.categoryName = categoryName;
          this.id = id;
        }
      }
/*-----------------------------------------------------------------------------------------------------------*/
      public interface QampaAPI {
        @GET("/api/category")
        Call<List<Category>> categoryDetailss();
      }
 /*-----------------------------------------------------------------------------------------------------------*/     

      public static void main(String... args) throws IOException {

           Log.w("retrofit","main()");
        // Create a very simple REST adapter which points the GitHub API.
        Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(API_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build();

        // Create an instance of our GitHub API interface.
        QampaAPI apiCall = retrofit.create(QampaAPI.class);

        // Create a call instance for looking up Retrofit categoryDetailss.
        Call<List<Category>> call = apiCall.categoryDetailss();

        // Fetch and print a list of the categoryDetailss to the library.
        List<Category> Categorys = call.execute().body();

        for (Category Category : Categorys) {
          Log.w("retrofit",Category.categoryName + " (" + Category.id + ")");
        }


      }

}

Answer 1

你是对的，你需要一个包装类来处理外部对象-

static class CategoryDetails {
     List<Category> categoryDetails;
     // add getter and setter
}

更新您的接口以使用此对象-

public interface QampaAPI {
    @GET("/api/category")
    Call<CategoryDetails> categoryDetailss();
}

你的电话呢--

Call<CategoryDetails> call = apiCall.categoryDetailss();
CategoryDetails details = call.execute().body();

您需要从详细信息对象内部访问该列表来迭代它。

Answer 2

根据错误状态，您的JSON响应与您创建的类不匹配。试试下面的POJO课程

public static class Category { 
public final List<CatergoryItem> categoryItem;

    public Category(List<CategoryItem> item) {
      this.categoryItem = item;
    }

  }
class CategoryItem{
 public String categoryName;
    public int id;
 //getter..setter 
}