Android

Question

我有 JSON 模型架构（这是来自 wikia api）：

{
    "HubInfo": [
    {
      "id": "integer",
      "name": "string",
      "url": "string",
      "language": "string"
    }
    ]
}

这是下载结果 JSON：

{
  "list": {
    "84": {
      "id": 84,
      "name": "Music Hub",
      "url": "http://musichub.wikia.com/",
      "language": "en"
    },
    "646052": {
      "id": 646052,
      "name": "Books Hub",
      "url": "http://bookshub.wikia.com/",
      "language": "en"
    },
    "952281": {
      "id": 952281,
      "name": "Lifestyle Hub",
      "url": "http://lifestylehub.wikia.com/",
      "language": "en"
    },
    "952442": {
      "id": 952442,
      "name": "Movies Hub",
      "url": "http://movieshub.wikia.com/",
      "language": "en"
    },
    "952445": {
      "id": 952445,
      "name": "Comics Hub",
      "url": "http://comicshub.wikia.com/",
      "language": "en"
    },
    "955764": {
      "id": 955764,
      "name": "Games Hub ",
      "url": "http://gameshub.wikia.com/",
      "language": "en"
    },
    "957447": {
      "id": 957447,
      "name": "TV Hub ",
      "url": "http://tvhub.wikia.com/",
      "language": "en"
    },
    "1114909": {
      "id": 1114909,
      "name": "Huddler Hub",
      "url": "http://huddlerhub.wikia.com/",
      "language": "en"
    },
    "1162644": {
      "id": 1162644,
      "name": "Rupertproducttest Wikia",
      "url": "http://rupertproducttest.wikia.com/",
      "language": "en"
    }
  }
}

这是我的 POJO：

public final class Test {
    public final HubInfo hubInfo[];

    public Test(HubInfo[] hubInfo){
        this.hubInfo = hubInfo;
    }

    public static final class HubInfo {
        public final String id;
        public final String name;
        public final String url;
        public final String language;

        public HubInfo(String id, String name, String url, String language){
            this.id = id;
            this.name = name;
            this.url = url;
            this.language = language;
        }
    }
}

当我运行时：

Test test = gson.fromJson(json, Test.class);

测试对象中的 HubInfo 为空。我究竟做错了什么？我正在使用 Volley 下载 JSON.

Answer 1

正如您在 JSON 中看到的，实际上它不是列表，而是字典。所以 GSON 无法在不丢失信息的情况下真正将其映射到列表。

如果您将 hubInfo 对象的类型更改为此类型：

@SerializedName("list")
Map<String, HubInfo> hubInfo;

并且还更改了构造函数，它应该可以工作。

然后您可以通过以下方式获取值：

hubInfo.get("84");

Android - Gson fromJson returns 空

Android - Gson fromJson returns null

json

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