Flutter如何知道AudioService已停止？

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

class MyAudioPlayer extends StatefulWidget {
  @override
  _MyAudioPlayerState createState() => _MyAudioPlayerState();
}

class _MyAudioPlayerState extends State<MyAudioPlayer> {
  bool isAudioServiceStopped = false;

  @override
  void initState() {
    super.initState();
    // 监听音频服务状态的变化
    AudioService.onAudioHandlerStateChanged.listen((AudioHandlerState state) {
      setState(() {
        // 检查音频服务是否已停止
        isAudioServiceStopped = state.playbackState == AudioPlaybackState.stopped;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Audio Player'),
      ),
      body: Center(
        child: Text(
          isAudioServiceStopped ? 'Audio Service is stopped' : 'Audio Service is running',
          style: TextStyle(fontSize: 20),
        ),
      ),
    );
  }
}