在应用程序关闭时如何关闭后台位置

Question

当应用不可见（仍在运行）时，我使用background_location: ^0.0.9+3来获取位置。但是，当我关闭应用程序而不关闭定位服务时，会出现此错误

E / BpSurfaceComposerClient（15446）：交易失败（-1） E / ActivityThread（15446）：活动 com.example.Location_background.MainActivity已泄漏 服务连接 com.almoullim.background_location.BackgroundLocationPlugin$mServiceConnection$1@5334970 最初绑定在这里E / ActivityThread（15446）： android.app.ServiceConnectionLeaked：活动 com.example.Location_background.MainActivity已泄漏 服务连接 com.almoullim.background_location.BackgroundLocationPlugin$mServiceConnection$1@5334970 最初绑定在这里

即使我以处置方式将其关闭也不起作用。

我的代码：

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

import 'package:flutter_local_notifications/flutter_local_notifications.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Background Location Notifier',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Background Location Notifier'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  void initState() {
    super.initState();
  }

  static void backgroundCallback(location) async {
    print('Sample app received data location: $location');

    FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
        new FlutterLocalNotificationsPlugin();
    var initializationSettingsAndroid =
        AndroidInitializationSettings('@mipmap/ic_launcher');
    var initializationSettingsIOS = IOSInitializationSettings();
    var initializationSettings = InitializationSettings(
        initializationSettingsAndroid, initializationSettingsIOS);
    flutterLocalNotificationsPlugin.initialize(initializationSettings);

    var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
        'location_update',
        'Location Updates',
        'You will receive location updates here',
        importance: Importance.Max,
        priority: Priority.High);
    var iOSPlatformChannelSpecifics = new IOSNotificationDetails();
    var platformChannelSpecifics = new NotificationDetails(
        androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
    await flutterLocalNotificationsPlugin.show(
        0,
        'New Location Received !',
        "${location.latitude}, ${location.longitude}",
        platformChannelSpecifics);
  }

  void _registerListener() async {
    BackgroundLocation.startLocationService();
    BackgroundLocation.getLocationUpdates((location) {
      backgroundCallback(location);
      print(location.toString());
    });
  }

  void _removeListener() async {
    BackgroundLocation.stopLocationService();
  }

  @override
  void dispose() {
    BackgroundLocation.stopLocationService();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
          child: Padding(
        padding: EdgeInsets.all(8.0),
        child: Column(
          children: <Widget>[
            RaisedButton(
              onPressed: () {
                _registerListener();
              },
              child: const Text('Register background service'),
            ),
            RaisedButton(
              onPressed: () {
                _removeListener();
              },
              child: const Text('Remove background service'),
            ),
          ],
        ),
      )),
    );
  }
}