使用Gson反序列化JSON Facebook Feed

Question

我有来自Facebook的JSON回复，其结构如下：

{
    "data": [
      {
         "id": "105458566194298_411506355589516",
         "message": "...",
         "type": "status",
         "created_time": "2012-11-25T17:26:41+0000",
         "updated_time": "2012-11-25T17:26:41+0000",
         "comments": {
            "count": 0
      },
      {
         "id": "105458566194298_411506355589516",
         "message": "...",
         "type": "status",
         "created_time": "2012-11-25T17:26:41+0000",
         "updated_time": "2012-11-25T17:26:41+0000",
         "comments": {
            "count": 0
      }
    ]
}

我正在尝试使用Gson库对其进行反序列化：

public class FacebookPost {
    public String Message;
    public String Created_time;
}

---

Gson gson = new GsonBuilder().create();

Type listType = new TypeToken<ArrayList<FacebookPost>>() {}.getType();

ArrayList<FacebookPost> userList = gson.fromJson(responseJsonString, listType);

如果响应不是"data": [ ] - 容器中的包装器，那么这显然会起作用。但是，如何告诉gson在JSON响应中查看data内部？

Answer 1

你应该做那样的事情：

InputStream source = retrieveStream(url);
Gson gson = new Gson();
Reader reader = new InputStreamReader(source);
APIResponse response = gson.fromJson(reader, APIResponse.class);

使用：

Public class APIResponse{

    ArrayList <FacebookPost> data;

    public class FacebookPost {
        public String message;
        public String created_time;
    }
}