播放页部分调整，播放链路已打通

lib/services/audio_service.dart

@@ -1,5 +1,5 @@
 // lib/services/audio_service.dart
-import 'dart:async'; // ⬅️ 添加这个导入
+import 'dart:async';
 import 'package:flutter/material.dart';
 import 'playback_service.dart';
 
@@ -22,6 +22,7 @@ class AudioService extends ChangeNotifier {
   bool _isPlaying = false;
   Duration _position = Duration.zero;
   Duration _duration = Duration.zero;
+  Duration _bufferedPosition = Duration.zero; // ✅ 新增：缓冲位置
 
   bool _listening = false;
   final List<StreamSubscription> _subscriptions = [];
@@ -30,12 +31,13 @@ class AudioService extends ChangeNotifier {
   bool get isPlaying => _isPlaying;
   Duration get position => _position;
   Duration get duration => _duration;
+  Duration get bufferedPosition => _bufferedPosition; // ✅ 新增 getter
 
-  // ✅ 完整的播放入口
   Future<void> playSong(Song song) async {
     _currentSong = song;
     _position = Duration.zero;
     _duration = Duration.zero;
+    _bufferedPosition = Duration.zero;
 
     _startListening();
     notifyListeners();
@@ -44,11 +46,9 @@ class AudioService extends ChangeNotifier {
       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() {
     if (_currentSong == null) return;
 
@@ -57,7 +57,6 @@ class AudioService extends ChangeNotifier {
     } else {
       PlaybackService().resume();
     }
-    // _isPlaying 由 player.stream.playing 更新
   }
 
   void stopPlay() {
@@ -65,6 +64,7 @@ class AudioService extends ChangeNotifier {
     _isPlaying = false;
     _position = Duration.zero;
     _duration = Duration.zero;
+    _bufferedPosition = Duration.zero;
     _stopListening();
     notifyListeners();
   }
@@ -75,7 +75,6 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ✅ 直接监听 media_kit 的三个独立 Stream
   void _startListening() {
     if (_listening) return;
     _listening = true;
@@ -108,6 +107,16 @@ class AudioService extends ChangeNotifier {
         }
       }),
     );
+
+    // ✅ 新增：监听缓冲位置
+    _subscriptions.add(
+      player.stream.buffer.listen((buffer) {
+        if (_bufferedPosition != buffer) {
+          _bufferedPosition = buffer;
+          notifyListeners();
+        }
+      }),
+    );
   }
 
   void _stopListening() {