当前固定audio_service为0.18.19，同时已优化媒体信息推送的部分能力，尚在进行媒体信息-播放进度的更新

lib/main.dart

@@ -52,6 +52,15 @@ void main() async {
   // ⭐ 创建 Handler（AudioService 稍后初始化）
   _audioHandler = AudioPlayerHandler();
 
+  // ⭐ 注册切歌回调：当歌曲切换时，立即更新通知
+  AudioService().setOnSongChanged((song) {
+    _audioHandler!.updateNotification(
+      id: song.id,
+      title: song.title,
+      artist: song.artist,
+    );
+  });
+
   runApp(
     MultiProvider(
       providers: [

lib/services/audio_player_handler.dart

@@ -4,81 +4,120 @@ import 'package:flutter/foundation.dart';
 import 'package:audio_service/audio_service.dart' as audio_service;
 import '../audio/player_controller.dart';
 import '../audio/playback_state_manager.dart';
-import '../services/audio_service.dart'; // 你自己的业务 AudioService
+import '../services/audio_service.dart';
 
 class AudioPlayerHandler extends audio_service.BaseAudioHandler {
   final PlayerController _player = PlayerController();
   final PlaybackStateManager _state = PlaybackStateManager();
 
+  String? _currentId;
+  String? _currentTitle;
+  String? _currentArtist;
+
   AudioPlayerHandler() {
-    // ---- 监听播放状态变化，同步到通知栏 ----
+    // ---- 播放状态 ----
     _player.playingStream.listen((playing) {
       _state.updatePlaying(playing);
       _publishState();
     });
 
+    // ---- 进度变化 ----
     _player.positionStream.listen((position) {
       _state.updatePosition(position);
-      final current = playbackState.value;
-      playbackState.add(audio_service.PlaybackState(
-        controls: current.controls,
-        processingState: current.processingState,
-        playing: current.playing,
-        androidCompactActionIndices: current.androidCompactActionIndices,
-        updateTime: DateTime.now(),
-      ));
+      // ⭐ 0.18.19 版本：通过更新 PlaybackState 的 updateTime 来驱动进度刷新
+      _publishStateOnly();
     });
 
+    // ---- 时长变化 ----
     _player.durationStream.listen((duration) {
       _state.updateDuration(duration);
+      if (_currentId != null && _currentTitle != null) {
+        _updateMediaItem(
+          id: _currentId!,
+          title: _currentTitle!,
+          artist: _currentArtist!,
+          duration: duration,
+        );
+      }
       _publishState();
     });
-
-    // ⭐ 已删除 completed 监听，交由 AudioService 统一处理
-    // _player.completedStream.listen((_) { ... });
   }
 
+  // ---- 发布完整状态 ----
   void _publishState() {
     playbackState.add(_state.playbackState);
   }
 
+  // ---- 0.18.19 版本：只更新时间戳，驱动系统刷新进度 ----
+  void _publishStateOnly() {
+    final current = playbackState.value;
+    playbackState.add(audio_service.PlaybackState(
+      controls: current.controls,
+      processingState: current.processingState,
+      playing: current.playing,
+      androidCompactActionIndices: current.androidCompactActionIndices,
+      updateTime: DateTime.now(), // ⭐ 关键：更新时间戳，系统会重新读取位置
+    ));
+  }
+
+  // ---- 更新媒体信息 ----
+  void _updateMediaItem({
+    required String id,
+    required String title,
+    required String artist,
+    Duration? duration,
+  }) {
+    _currentId = id;
+    _currentTitle = title;
+    _currentArtist = artist;
+
+    debugPrint('📢 [handler] updateMediaItem: $title - $artist');
+
+    mediaItem.add(audio_service.MediaItem(
+      id: id,
+      title: title,
+      artist: artist,
+      duration: duration ?? _player.duration,
+    ));
+  }
+
+  // ---- 外部接口 ----
   void updateNotification({
     required String id,
     required String title,
     required String artist,
   }) {
-    debugPrint('📢 [handler] updateNotification: $title');
-    mediaItem.add(audio_service.MediaItem(
-      id: id,
-      title: title,
-      artist: artist,
-      duration: _player.duration,
-    ));
+    _updateMediaItem(id: id, title: title, artist: artist);
+    _publishState();
   }
 
-  // ---- 系统控制命令 ----
+  // ---- 控制命令 ----
   @override
   Future<void> play() async {
     debugPrint('▶️ [handler] play() called');
     _player.play();
+    _publishState();
   }
 
   @override
   Future<void> pause() async {
     debugPrint('⏸️ [handler] pause() called');
     _player.pause();
+    _publishState();
   }
 
   @override
   Future<void> stop() async {
     debugPrint('⏹️ [handler] stop() called');
     _player.stop();
+    _publishState();
   }
 
   @override
   Future<void> seek(Duration position) async {
     debugPrint('⏩ [handler] seek() called: $position');
     _player.seek(position);
+    _publishStateOnly();
   }
 
   @override

lib/services/audio_service.dart

@@ -51,6 +51,9 @@ class AudioService extends ChangeNotifier {
   // ⭐ 防重入标志
   bool _handlingCompletion = false;
 
+  // ⭐ 歌曲切换回调（用于通知 Handler 更新 MediaItem）
+  void Function(Song)? _onSongChanged;
+
   // ---- Getter（高频字段不走 ChangeNotifier） ----
   Song? get currentSong => _currentSong;
   bool get isPlaying => _isPlaying;
@@ -75,6 +78,11 @@ class AudioService extends ChangeNotifier {
     }
   }
 
+  // ---- 注册歌曲切换回调 ----
+  void setOnSongChanged(void Function(Song) callback) {
+    _onSongChanged = callback;
+  }
+
   // ---- 切换播放模式 ----
   void togglePlayMode() {
     switch (_playMode) {
@@ -138,6 +146,9 @@ class AudioService extends ChangeNotifier {
     final song = _queue[_currentIndex];
     _currentSong = song;
 
+    // ⭐ 切歌时触发回调（通知 Handler 更新 MediaItem）
+    _onSongChanged?.call(song);
+
     // ⭐ 重置进度（用 ValueNotifier）
     positionNotifier.value = Duration.zero;
     durationNotifier.value = Duration.zero;
@@ -266,7 +277,7 @@ class AudioService extends ChangeNotifier {
       }),
     );
 
-    // ⭐ 唯一监听 completed 的地方
+    // ⭐ 唯一监听 completed 的地方（带防重入）
     _subscriptions.add(
       player.stream.completed.listen((_) {
         _onPlaybackCompleted();
@@ -282,7 +293,7 @@ class AudioService extends ChangeNotifier {
     _subscriptions.clear();
   }
 
-  // ⭐ 防重入
+  // ⭐ 防重入的完成事件处理
   void _onPlaybackCompleted() {
     if (_handlingCompletion) {
       debugPrint('⚠️ [service] completed ignored: already handling');