如何在Android中使用Retrofit解析嵌套的json对象

Question

我想使用Retrofit解析嵌套项目对象。 这是我的对象

        {  
       "items":{  
          "Veg Main Course":[  
             {  
                "category":"27013046129796342702616905670",
                "description":"",
                "price":100.0,
                "name":"Aloo 65"
             },
             {  
                "category":"27013046129796342702616905670",
                "description":"",
                "price":100.0,
                "name":"Finger Chips"
             },
             {  
                "category":"27013046129796342702616905670",
                "description":"",
                "price":100.0,
             }
         ],
     "Bityanis":[  
         {  
            "category":"27013046129796342702616905670",
            "description":"",
            "price":100.0,
            "name":"Aloo 65"
         },
         {  
            "category":"27013046129796342702616905670",
            "description":"",
            "price":100.0,
            "name":"Finger Chips"
         },
         {  
            "category":"27013046129796342702616905670",
            "description":"",
            "price":100.0,
         }
     ]
.
.
.
So on...
    }

我做了如下的改造模型

public class RetroData {
    public Map<String,Menu> items;
}
public class Menu {
    public Map<String, ItemArray> cat_menu;

}
public class ItemArray {
    public ArrayList<MenuItem> itemArray;

}
public class MenuItem {

    public String category;
    public String description;
    public String price;
    public String is_active;
    public String id;
    public String disabled;
    public String sales_count;
    public String image;
    public String name;


}

但是，当我尝试解析此数据时，仍然出现错误。 谁能帮我这个 ？ 我不确定我在哪里做错了。

这就是我建立Api电话的方式。

public abstract interface RestService {

    @GET("/MyApp/api/menu/all")
    public abstract void getMenu(Callback<RetroData> response);


}

RestAdapter adapter = new RestAdapter.Builder()
                .setEndpoint(ROOT_URL)
                .build();
RestService api = adapter.create(RestService.class);

这是我得到的错误

06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err: retrofit.RetrofitError: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 32 path $.items.
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err:     at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:383)
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err:     at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err:     at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err:     at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err:     at retrofit.Platform$Android$2$1.run(Platform.java:142)
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err:     at java.lang.Thread.run(Thread.java:818)
06-26 22:16:21.136 4194-4194/com.example.adam.myfirstapp W/System.err: Caused by: retrofit.converter.ConversionException: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 32 path $.items.
06-26 22:16:21.137 4194-4194/com.example.adam.myfirstapp W/System.err:     at retrofit.converter.GsonConverter.fromBody(GsonConverter.java:67)
06-26 22:16:21.137 4194-4194/com.example.adam.myfirstapp W/System.err:     at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:367)
06-26 22:16:21.137 4194-4194/com.example.adam.myfirstapp W/System.err:  ... 7 more
06-26 22:16:21.137 4194-4194/com.example.adam.myfirstapp W/System.err: Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 32 path $.items.
06-26 22:16:21.139 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:200)
06-26 22:16:21.140 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
06-26 22:16:21.140 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:187)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:103)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:196)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.Gson.fromJson(Gson.java:810)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.Gson.fromJson(Gson.java:775)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:     at retrofit.converter.GsonConverter.fromBody(GsonConverter.java:63)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:  ... 8 more
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err: Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 32 path $.items.
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:387)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:189)
06-26 22:16:21.141 4194-4194/com.example.adam.myfirstapp W/System.err:  ... 16 more

Answer 1

如您所见，错误状态为“预期BEGIN_OBJECT，但之前为BEGIN_ARRAY”。 在RetroData类中，您期望“ items”是字符串和Menu（object）类型的映射，但是在响应中您没有得到Menu对象，而是得到了MenuItems的Array。

尝试这个：

public class RetroData {
public Map<String,List<MenuItem>> items;
}


public class MenuItem {
    public String category;
    public String description;
    public String price;
    public String is_active;
    public String id;
    public String disabled;
    public String sales_count;
    public String image;
    public String name;
}

希望这行得通。 PS我还没有亲自测试过。