当屏幕锁定在Flutter中时，如何收听位置变化？

Question

我有一个非常简单的示例，我想知道是否有可能，如果可以的话，如何在屏幕锁定甚至应用程序处于后台时侦听更改

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: "Navigation",
      home: ListenPage(),
    );
  }
}

class ListenPage extends StatefulWidget {
  @override
  _ListenPageState createState() => _ListenPageState();
}

class _ListenPageState extends State<ListenPage> {

  Location location = Location();

  Map<String, double> currentLocation;

  @override
  void initState() {
    super.initState();
    location.onLocationChanged().listen((value) {
      setState(() {
        currentLocation = value;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: <Widget>[
          currentLocation == null
              ? CircularProgressIndicator()
              : Text("Location:" + currentLocation["latitude"].toString() + " " + currentLocation["longitude"].toString()),
        ],
      ),
    );
  }
}

非常感谢您的帮助。