如何更改颤动onchangedlocation.listen上的int间隔设置

import 'package:location/location.dart';

Location location = new Location();

LocationOptions locationOptions = LocationOptions(
  accuracy: LocationAccuracy.high,
  distanceFilter: 10, // 设置位置变化的最小距离
  interval: 5000, // 设置回调的间隔时间为5秒
);

location.changeSettings(locationOptions);

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Location Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Location location = new Location();
  LocationData currentLocation;

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

  void initLocation() async {
    LocationData locationData;
    try {
      locationData = await location.getLocation();
    } catch (e) {
      locationData = null;
    }
    setState(() {
      currentLocation = locationData;
    });

    location.onLocationChanged.listen((LocationData locationData) {
      setState(() {
        currentLocation = locationData;
      });
    });
  }

  void changeInterval(int interval) {
    LocationOptions locationOptions = LocationOptions(
      accuracy: LocationAccuracy.high,
      distanceFilter: 10,
      interval: interval,
    );
    location.changeSettings(locationOptions);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Location Demo'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Latitude: ${currentLocation?.latitude ?? 'Unknown'}',
            ),
            Text(
              'Longitude: ${currentLocation?.longitude ?? 'Unknown'}',
            ),
            RaisedButton(
              child: Text('Change Interval'),
              onPressed: () {
                changeInterval(2000); // 更改回调间隔时间为2秒
              },
            ),
          ],
        ),
      ),
    );
  }
}