Android处理后台返回特殊类型的Json数据解决办法--Map集合的处理

最近在工作中有这样一个字符串 ;

{
    "avatar_version": 5,
    "history_list": [
        {
            "content": "134659",
            "content_id": "5cbaac11e0e7d4247",
            "content_type": "text",
            "from_avatar": 5,
            "from_is_room_admin": true,
            "from_nickname": "木瓜",
            "from_uid": "xy000007981",
            "from_user_id": 7981,
            "from_user_level": 10,
            "time": "2019-04-20 13:20:17",
            "to_uid": "all",
            "type": "say"
        }
    ],
    "user_list": {
        "xy000006035": {
            "avatar_version": 10,
            "ban_status": false,
            "handicap_uid": "xy000006035",
            "is_room_admin": true,
            "level_name": "vip9",
            "nickname": "nice最帅",
            "user_id": 6035,
            "user_level": 10
        },
        "xy000007981": {
            "avatar_version": 5,
            "ban_status": false,
            "handicap_uid": "xy000007981",
            "is_room_admin": true,
            "level_name": "vip9",
            "nickname": "木瓜",
            "user_id": 7981,
            "user_level": 10
        },
        "xy000009192": {
            "avatar_version": 3,
            "ban_status": false,
            "handicap_uid": "xy000009192",
            "is_room_admin": false,
            "level_name": "vip1",
            "nickname": "我爱nice",
            "user_id": 9192,
            "user_level": 2
        }
    }
}{
    "avatar_version": 5,