还在尝试跑通播放状态

lib/services/audio_service.dart

@@ -1,4 +1,7 @@
+// lib/services/audio_service.dart
+import 'dart:async'; // ⬅️ 添加这个导入
 import 'package:flutter/material.dart';
+import 'playback_service.dart';
 
 class Song {
   final String id;
@@ -17,24 +20,101 @@ class Song {
 class AudioService extends ChangeNotifier {
   Song? _currentSong;
   bool _isPlaying = false;
+  Duration _position = Duration.zero;
+  Duration _duration = Duration.zero;
+
+  bool _listening = false;
+  final List<StreamSubscription> _subscriptions = [];
 
   Song? get currentSong => _currentSong;
   bool get isPlaying => _isPlaying;
+  Duration get position => _position;
+  Duration get duration => _duration;
 
-  void playSong(Song song) {
+  // ✅ 完整的播放入口
+  Future<void> playSong(Song song) async {
     _currentSong = song;
-    _isPlaying = true;
+    _position = Duration.zero;
+    _duration = Duration.zero;
+
+    _startListening();
     notifyListeners();
+
+    if (song.url == null || song.url!.isEmpty) {
+      return;
+    }
+
+    // 播放由 PlaybackService 执行，状态由 stream 更新
+    await PlaybackService().play(song.url!);
   }
 
+  // ✅ 只调用播放器方法，不手动修改 _isPlaying
   void togglePlay() {
-    _isPlaying = !_isPlaying;
-    notifyListeners();
+    if (_currentSong == null) return;
+
+    if (_isPlaying) {
+      PlaybackService().pause();
+    } else {
+      PlaybackService().resume();
+    }
+    // _isPlaying 由 player.stream.playing 更新
   }
 
   void stopPlay() {
     _currentSong = null;
     _isPlaying = false;
+    _position = Duration.zero;
+    _duration = Duration.zero;
+    _stopListening();
     notifyListeners();
   }
+
+  void seekTo(Duration position) {
+    PlaybackService().seek(position);
+    _position = position;
+    notifyListeners();
+  }
+
+  // ✅ 直接监听 media_kit 的三个独立 Stream
+  void _startListening() {
+    if (_listening) return;
+    _listening = true;
+
+    final player = PlaybackService().player;
+
+    _subscriptions.add(
+      player.stream.playing.listen((playing) {
+        if (_isPlaying != playing) {
+          _isPlaying = playing;
+          notifyListeners();
+        }
+      }),
+    );
+
+    _subscriptions.add(
+      player.stream.position.listen((position) {
+        if (_position != position) {
+          _position = position;
+          notifyListeners();
+        }
+      }),
+    );
+
+    _subscriptions.add(
+      player.stream.duration.listen((duration) {
+        if (_duration != duration) {
+          _duration = duration;
+          notifyListeners();
+        }
+      }),
+    );
+  }
+
+  void _stopListening() {
+    _listening = false;
+    for (final subscription in _subscriptions) {
+      subscription.cancel();
+    }
+    _subscriptions.clear();
+  }
 }