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我是 Flutter 的新手,我正在尝试将联系人列表作为姓名和号码存储在本地数据库中。我编写的代码在我用作模拟器的三星 A21S 设备上运行,但在小米之类的设备上运行,我哪里出错了?

void getContacts() async {
  List<Contact>? _contacts;
  List<String> contactList = [];

  final bool isConnected = await InternetConnectionChecker().hasConnection;
  if (isConnected) {
    _contacts = await FlutterContacts.getContacts(
        withThumbnail: false, withPhoto: false, withProperties: true);
    for (var i = 0; i < _contacts.length; i++) {
      //Error this line
      var num = _contacts[i].phones.first.normalizedNumber;
      var name = _contacts[i].displayName;
      var nameNum = "$name,$num";
      contactList.insert(i, nameNum);
    }
    print(contactList);
    print(contactList.length);
    String json = jsonEncode(contactList);
  
  }
}
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