Question

我每次都会收到此错误：预计begin_array但是begin_object 我不知道是否需要添加反序列化程序或warrper类来进行改造，但我不会＃ 39;我知道如何以一种简单的方式来完成我的所有项目的api json响应，这是我的改造代码尝试：

-

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

根据错误状态，您的JSON响应与您创建的类不匹配。请尝试以下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 
}

Answer 2

你是对的，你需要一个包装类来处理外部对象 -

Status
0 NO RESPONSE Show explanation Loading time: 2012
Request headers 
foo: bar
Origin: chrome-extension://hgmloofddffdnphfgcellkdfbfbjeloo
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/46.0.2490.80 Safari/537.36 
Content-Type: application/x-www-form-urlencoded  
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8

更新您的界面以使用此对象 -

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

和你的电话 -

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

您需要从Call<CategoryDetails> call = apiCall.categoryDetailss(); CategoryDetails details = call.execute().body();对象内部访问列表以迭代它。

Retrofit 2.0.0 beta2：期望begin_array但是begin_object

2 个答案: