json - 如何在Flutter中解析长度为1的JSON数组？

Question

这是我的长度为JSON数组的代码，该数组返回长度为0的结果:

class profilInfo {
  final List<information> result;
  profilInfo._({ this.result});
  factory profilInfo.fromJson(Map jsonMap) {
    return new profilInfo._(
        result : (jsonMap['result'] as List).map((i) =>
            information.fromJson(i)).toList()
    );
  }
}

class information{
  final String firstname;
  final String country;
  final String city;
  final String about;
  final String profilephoto;
  information._({
    this.firstname,this.country,this.about,this.city,this.profilephoto});
    factory information.fromJson(Map jsonMap) {
    return new information._(
      firstname : jsonMap['first_name'],
      country : jsonMap['country'],
      city : (jsonMap['city']),
      about : (jsonMap['about']),
      profilephoto : (jsonMap['profile_photo']),
    );
  }
}

我有一个JSON文件:

{
  "status": 200,
  "result": [
    {
      "username": "mohammad",
      "password": "202cb962ac59075b964b07152d234b70",
      "create_date": "2019-08-13T08:53:24.997Z",
      "modify_date": "2019-08-13T08:53:24.997Z",
      "last_pay_date": null,
      "first_name": "mohammad reza shabani",
      "last_name": " ",
      "country": "usa",
      "city": "alai",
      "phone": "09120564589",
      "users_id": [],
      "profile_photo": "",
      "about": "",
      "_id": "5d527a84abe6713aacc62453",
      "__v": 0
    }
  ]
}

我收到此错误:

[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: RangeError (index): Invalid value: Valid value range is empty: 0

Answer 1

我建议您要做的就是使用这个很棒的网站quik_types
为了创建将json对象转换为数据模型所需的类和函数，只需给他一个需要转换的json对象，其余的就交给他。它更快，输入更安全，因此可以节省很多不必要的工作和时间