How to get Device Id in Flutter

dev_dependencies:
  device_info: ^0.4.2+1

import 'package:device_info/device_info.dart';
import 'package:flutter/material.dart';

class GetDeviceInfo extends StatefulWidget {
  @override
  _GetDeviceInfoState createState() => _GetDeviceInfoState();
}

class _GetDeviceInfoState extends State<GetDeviceInfo> {
  DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
  AndroidDeviceInfo androidInfo;

  fetchDeviceInfo() async {
    androidInfo = await deviceInfo.androidInfo;
    setState(() {

    });
  }

  @override
  void initState() {
    super.initState();

  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Get Device Information Example')),
      body: (androidInfo==null)?Center(
        child: FlatButton(
          color: Colors.pink,
          child: Text("Device Info",style: TextStyle(
            color: Colors.white,fontSize: 18
          ),),
          onPressed: (){
            fetchDeviceInfo();
          },
        ),
      ):Column(
        children: <Widget>[
          ListTile(
            title: Text('Device Id: ${androidInfo.id}, '),
          ), ListTile(
            title: Text('Manufacturer: ${androidInfo.manufacturer}, '),
          ),
          ListTile(
            title: Text('Product: ${androidInfo.product}, '),
          ),
          ListTile(
            title: Text('Android Version: ${androidInfo.version.codename}, '),
          ),
        ],
      ),
    );
  }
}

void main() => runApp(MyApp());

class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      theme: ThemeData(
        primaryColor: Colors.pink
      ),
      home: GetDeviceInfo(),
    );
  }

}