Question

我正在尝试使用Retrofit 2进行JSON解析。我必须为我的项目打电话。这是我的代码：

    retrofit2.Call<Map<String, Channel>> call =restInterface.getChannels();
    call.enqueue(new Callback<Map<String, Channel>>() {

        @Override
        public void onResponse(Response<Map<String, Channel>> response) {
            Map<String, Channel> body = response.body();
            for (Channel channel : body.values()) {
                System.out.println(channel.getSong());
            }
        }

        @Override
        public void onFailure(Throwable t) {
            // TODO
        }
    });

我收到不兼容的类型错误，Android Studio建议转到此处：

retrofit2.Call<Map<String, Channel>> call =restInterface.getChannels();

对此：

retrofit2.Call<List<Channel>> call =restInterface.getChannels();

我知道这是因为Retrofit的原始类型，但是对于我的项目，我必须执行此调用。在这里，您可以看到我的JSON在API中的样子：

{  
   "channel0":{  
      "song":"Cry Cry",
      "artist":"Oceana",
      "duration":"180",
      "playedat":"1545158211",
      "image_extralarge":"https:\/\/lastfm-img2.akamaized.net\/i\/u\/300x300\/550513f3aaa5b80648972e715af345e5.png"
   },
   "channel1":{  
      "song":"Phantom Of The Opera",
      "artist":"Iron Maiden",
      "duration":"420",
      "playedat":"1545158002",
      "image_extralarge":"https:\/\/lastfm-img2.akamaized.net\/i\/u\/300x300\/b2cf018fb80147428b698452b2512996.png"
   },
   "channel2":{  
      "song":"Carmen Cubana",
      "artist":"Klazz Brothers",
      "duration":"180",
      "playedat":"1545158161",
      "image_extralarge":"https:\/\/lastfm-img2.akamaized.net\/i\/u\/300x300\/d518730378364a72ab98460bd0fe3d1a.png"
   },
   "channel3":{  
      "song":"Shut Up And Let Me Go",
      "artist":"The Ting Tings",
      "duration":"120",
      "playedat":"1545158234",
      "image_extralarge":"https:\/\/lastfm-img2.akamaized.net\/i\/u\/300x300\/c5805b786a3e4f19b747c7a3dbb41d15.png"
   },
   "channel4":{  
      "song":"The Racing Rats",
      "artist":"Editors",
      "duration":"240",
      "playedat":"1545158095",
      "image_extralarge":"https:\/\/lastfm-img2.akamaized.net\/i\/u\/300x300\/62544562d1904884b6e47804cf1ede1d.png"
   }
}

那么，我该怎么办呢？我对该主题了解不多，因此我完全愿意就问题提出建议或示例。感谢您的帮助。

Answer 1

这是您如何定义翻新服务界面的问题。在某个地方，您应该有一个interface如下所示：

public interface MyRetrofitService {

    @GET("/some/url")
    Call<List<Channel>> getChannels();
}

您将不得不更改它以返回Map<String, Channel>而不是列表：

public interface MyRetrofitService {

    @GET("/some/url")
    Call<Map<String, Channel>> getChannels();
}

Retrofit2 Map <object，string =“”>调用不兼容类型错误

1 个答案: