接口定義中要寫明轉換類型 TYNetworkingRespondModel

public class TYNetworkingRespondModel {
    private String Msg;
    private int Code;
    private Map Data;
}

@GET("app/MobileApp.ashx")
    Call<TYNetworkingRespondModel> createGetRequest(@Query("Module") String module,@Query("Param") String param);

自定義Factory中處理轉換

public class MyConverterFactory extends Converter.Factory {
    public static MyConverterFactory create() {
        return create(new Gson());
    }

    private final Gson gson;

    public static MyConverterFactory create(Gson gson) {
        return new MyConverterFactory(gson);
    }

    private MyConverterFactory(Gson gson) {
        if (gson == null) throw new NullPointerException("gson == null");
        this.gson = gson;
    }

//    @javax.annotation.Nullalbe
    @Override
    public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
        TypeAdapter<?> adapter = gson.getAdapter(TypeToken.get(type));
        //判斷響應實體類型是否是我們需要特殊處理的特殊類型(此處以String類型)
        if (type == TYNetworkingRespondModel.class) {
            //創(chuàng)建xxConverter來 進行特殊轉換
            return new MyResponseConverter<TYNetworkingRespondModel>(gson);
        } else {
            //其它類型我們不處理，返回null就行 會交給后面的解析器來解析
            return null;
        }
    }

    private class MyResponseConverter<T> implements Converter<ResponseBody, T> {
        private final Gson gson;

        MyResponseConverter(Gson gson) {
            this.gson = gson;
        }

        @Override
        public T convert(ResponseBody value) throws IOException {
            //在此處進行我們的轉換
            String response = value.string();
            TYNetworkingRespondModel movieDataBean = gson.fromJson(response, TYNetworkingRespondModel.class);
//            return (T) response;
            return (T) movieDataBean;
        }

    }
}

具體使用

Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl(TYStaticDefine.STR_BASE_URL)
                    .addConverterFactory(MyConverterFactory.create())
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();

更復雜的轉化可以通過自定義JsonDeserializer實現

詳情見：http://www.javacreed.com/gson-deserialiser-example/