java - 使用 Gson 动态解析 JSON 字段类型

Question

我有以下 API 响应:

{  
   "data":{  
      "categoryFields":[  
         {  
            "name":"brand",
            "label":"Marca", 
            "values":[  
               {  
                  "key":53,
                  "value":"Alfa Romeo"
               },
               {  
                  "key":55,
                  "value":"Audi"
               }
            ]
         },
         {  
            "name":"year",
            "label":"Año", ,
            "dataType":"select",
            "values":[  
               {  
                  "key":2017,
                  "value":2017
               },
               {  
                  "key":2016,
                  "value":2016
               }
            ]
         },

      ]
   }
}

好的，第一个 categoryField 中的值为:

"key":53 INT,
"value":"Alfa Romeo", STRING

在第二个categoryField中，值是:

 "key":2017, INT
 "value":2017, INT

还有另一种类型:

 "key":"string", STRING
 "value":"String", STRING

我需要一个可以处理这些类型数据的类。像这样的东西:

public class Value {

    @SerializedName("key")
    @Expose
    private DYNAMIC_TYPE key;

    @SerializedName("value")
    @Expose
    private DYNAMIC_TYPE value; 

}

我怎样才能做到这一点？或者有一个 Gson 函数可以帮助我做到这一点？

Answer 1

解决方案

public class CategoryValueDeserializer implements JsonDeserializer<CategoryValue> {
    @Override
    public CategoryValue deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {

        final JsonObject jsonObject = json.getAsJsonObject();

        final JsonElement jsonKey = jsonObject.get("key");
        final String key = jsonKey.getAsString();

        final JsonElement jsonValue = jsonObject.get("value");
        final String value = jsonValue.getAsString();

        CategoryValue categoryValue = new CategoryValue();
        categoryValue.setKey(key);
        categoryValue.setValue(value);

        return categoryValue;

    }
}

//改造

 final Gson gson = new GsonBuilder()
                .registerTypeAdapter(Response.class, new CategoryValueDeserializer())
                .create();

        Retrofit.Builder builder = new Retrofit.Builder()
                .baseUrl(END_POINT)
                .addConverterFactory(GsonConverterFactory.create(gson))
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create());