Flutter-get-device-info.dart

//// Using Device Info Package................

Future<String> _getId() async {
  DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
  if (Theme.of(context).platform == TargetPlatform.iOS) {
    IosDeviceInfo iosDeviceInfo = await deviceInfo.iosInfo;
    return iosDeviceInfo.identifierForVendor; // unique ID on iOS
  } else {
    AndroidDeviceInfo androidDeviceInfo = await deviceInfo.androidInfo;
    return androidDeviceInfo.androidId; // unique ID on Android
  }
}