Retrofit2.0 Json解析成HashMap

1、比如，接口返回数据如下所示：

{
  "id": 11,
  "name": "电量仪E3",
  "A相功率因数": "0.0",
  "A相总功率": "0.0",
  "A相无功功率": "0.0",
  "A相视在功率": "0.0",
  "B相功率因数": "0.0",
  "B相总功率": "0.0",
  "B相无功功率": "0.0",
  "B相视在功率": "0.0",
  "C相功率因数": "0.0",
  "C相总功率": "0.0",
  "C相无功功率": "0.0",
  "C相视在功率": "0.0",
  "报错": "0.0",
  "A相电流": "0.0",
  "B相电流": "0.0",
  "C相电流": "0.0",
  "A相功率": "0.0",
  "B相功率": "0.0",
  "C相功率": "0.0",
  "A相电压": "0.0",
  "B相电压": "0.0",
  "C相电压": "0.0",
  "系统功率因数": "0.0",
  "系统无功功率": "0.0",
  "系统有功功率": "0.0",
  "系统视在功率": "0.0",
  "频率": "0.0",
  "系统总功率": "0.0",
  "AB线电压": "0.0",
  "AC线电压": "0.0",
  "BC线电压": "0.0",
  "负荷特性": "0.0"
}

2、按照json解析成Hash，而不是转化为pojo，目的是为了更好地显示数据，如下图：

google过，按照别人的文章，我自己试了一下：

Call<Response> call = myService.getDeviceData(room_id, device_id);
        call.enqueue(new Callback<Response>() {
            @Override
            public void onResponse(Response<Response> response) {
                if (response.body().code() == 200) {
                    String jsonString = response.body().toString();
                    System.out.println(">>>>>>>>>");
                    System.out.println(jsonString);
                    System.out.println(">>>>>>>>>");
                } else {

                }
            }

            @Override
            public void onFailure(Throwable t) {
                System.out.println("设备数据获取失败");
                // TODO: 16/2/22 错误处理
            }
        });

但是运行时会报错：
'retrofit2.Response' is not a valid response body type. Did you mean ResponseBody?
总结：我需要展示json数据的key和value，如果有可行的解决方案，不转化成hashmap也行，，希望各位朋友们能指点迷津