如何让应用程序在flutter上后台运行？

dependencies:
  flutter_background_service: ^1.0.0

import 'package:flutter_background_service/flutter_background_service.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  FlutterBackgroundService.initialize(onStart);
  runApp(MyApp());
}

void onStart() {
  // 执行需要在后台运行的任务逻辑
  WidgetsFlutterBinding.ensureInitialized();
  final service = FlutterBackgroundService();
  service.onDataReceived.listen((event) {
    if (event["action"] == "stopService") {
      service.stopBackgroundService();
    }
  });
  // 执行后台任务逻辑
  Timer.periodic(Duration(seconds: 5), (timer) async {
    if (!(await service.isServiceRunning())) {
      timer.cancel();
      return;
    }
    // 在后台运行的任务逻辑
    print("Running in background...");
    // 发送通知、执行网络请求等操作
    service.setNotificationInfo(
      title: 'App is running in background',
      content: 'Background services are running...',
    );
    service.sendData(
      {"current_time": DateTime.now().toIso8601String()},
    );
  });
  runApp(MyApp());
}

import 'package:flutter_background_service/flutter_background_service.dart';

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            if (FlutterBackgroundService.isServiceRunning()) {
              FlutterBackgroundService.sendData(
                {"action": "stopService"},
              );
            } else {
              FlutterBackgroundService.start();
            }
          },
          child: Text(
            FlutterBackgroundService.isServiceRunning()
                ? 'Stop Background Service'
                : 'Start Background Service',
          ),
        ),
      ),
    );
  }
}