即使关闭我的应用程序，也可以在后台运行dart代码

在flutter中，我正在使用adhara_socket_io打开套接字并从服务器接收数据，以使用flutter_local_notifications推送通知，并且在应用程序运行时可以正常工作，现在我需要在后台运行此程序，以便在我的应用程序未运行时运行仍然从我的服务器接收数据并推送通知，无论如何还是要这样做吗？

   void initSocket() async {
    final deviceInfo = await Constants.getDeviceDetails();
    final String deviceId = deviceInfo[2];
    Uuid uuid = Uuid();
    print(deviceInfo);
    final id = uuid.v5(Uuid.NAMESPACE_URL, deviceId);
    print('id ' + id);

    SocketIOManager manager = SocketIOManager();
    SocketIO socket = await manager.createInstance(
      SocketOptions(URI,
          enableLogging: false,
          transports: [Transports.WEB_SOCKET /*, Transports.POLLING*/]),
    );
    socket.onConnect((data) {
      print("connected...");
      print(data);
      socket.emit('settings', [
        {'device_id': id}
      ]);
    });
    socket.onConnectError((_) => print('connect error'));
    socket.onConnectTimeout((_) => print('timeout'));
    socket.onError((_) => print('error'));
    socket.onDisconnect((_) => print('disconnect'));
    socket.on('notif', (data) {
      print('notif');
      _showNotificationWithDefaultSound(data['heading'],data['content']);
    });
    socket.connect();
  }

  initNotifications() {
    var initializationSettingsAndroid = AndroidInitializationSettings('@mipmap/ic_launcher');
    var initializationSettingsIOS = IOSInitializationSettings();
    var initializationSettings = InitializationSettings(initializationSettingsAndroid,initializationSettingsIOS);
    flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
    flutterLocalNotificationsPlugin.initialize(initializationSettings,onSelectNotification: onSelectNotification);
  }

  Future onSelectNotification(String payload)async{
    print('payload');
  }

  Future _showNotificationWithDefaultSound(heading,content) async {
  var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
      'your channel id', 'your channel name', 'your channel description',
      importance: Importance.Max, priority: Priority.High);
  var iOSPlatformChannelSpecifics = new IOSNotificationDetails();
  var platformChannelSpecifics = new NotificationDetails(
      androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
  await flutterLocalNotificationsPlugin.show(
    0,
    heading,
    content,
    platformChannelSpecifics,
    payload: 'Default_Sound',
  );
}