feat(ui): 收藏项无元数据时，副标题显示上级文件夹名（带括号）

之前无标签时副标题固定写"收藏"，和"歌手"语义混在一起。
现在取 path 的上一级目录（解码后）显示为 "(B-未分类)" 这种形式：
- 括号清楚表明是目录，不是艺术家
- 有标签时仍优先显示艺术家
- 目录层级不足或解码失败时回退为空（displaySubtitle 兜底"未知艺术家"）

真机验证：收藏项显示 "13楼的大笨象 - 郑融" / "(B-未分类)"。

.gitignore

@@ -35,3 +35,19 @@ desktop.ini
 /tmp/
 *.tmp
 .flutter-plugins-dependencies
+
+# ---------- 本地构建 / IDE 产物 ----------
+gradle-build.log
+*.iml
+
+# ---------- 个人笔记（不上传） ----------
+bug-todo.txt
+
+# ---------- 服务器/监控日志（本地参考，不上传） ----------
+monitor-log-*.csv
+
+# ---------- 签名材料（绝不入库） ----------
+android/key.properties
+android/keystore/
+*.jks
+*.keystore

.metadata

@@ -4,7 +4,7 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: "ad70ec4617166f1c38e5d2bfd388af71fda14f06"
+  revision: "d3b14c876900e553bc736ca19295fc09e3853e8e"
   channel: "stable"
 
 project_type: app
@@ -13,26 +13,11 @@ project_type: app
 migration:
   platforms:
     - platform: root
-      create_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-      base_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
+      create_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
+      base_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
     - platform: android
-      create_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-      base_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-    - platform: ios
-      create_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-      base_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-    - platform: linux
-      create_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-      base_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-    - platform: macos
-      create_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-      base_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-    - platform: web
-      create_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-      base_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-    - platform: windows
-      create_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
-      base_revision: ad70ec4617166f1c38e5d2bfd388af71fda14f06
+      create_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
+      base_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
 
   # User provided section
 

android/.gitignore

@@ -8,11 +8,10 @@ GeneratedPluginRegistrant.java
 .cxx/
 .kotlin
 /build
-
+.settings
 
 # Remember to never publicly share your keystore.
 # See https://flutter.dev/to/reference-keystore
 key.properties
 **/*.keystore
 **/*.jks
-.settings

android/app/build.gradle.kts

@@ -1,11 +1,24 @@
 plugins {
     id("com.android.application")
+    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id("dev.flutter.flutter-gradle-plugin")
 }
 
+// 正式签名：android/key.properties（不入库）
+// 文件缺失时自动回退到 debug keystore，保证 clone 下来也能直接构建
+import java.io.FileInputStream
+import java.util.Properties
+
+val keystorePropertiesFile = rootProject.file("key.properties")
+val keystoreProperties = Properties()
+val hasReleaseKeystore = keystorePropertiesFile.exists()
+if (hasReleaseKeystore) {
+    FileInputStream(keystorePropertiesFile).use { keystoreProperties.load(it) }
+}
+
 android {
     namespace = "com.lxh.qingting_player"
-    compileSdk = 36
+    compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
     compileOptions {
@@ -14,49 +27,65 @@ android {
     }
 
     defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId = "com.lxh.qingting_player"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion
-        targetSdk = 34
+        targetSdk = flutter.targetSdkVersion
+        // Uses the version code from pubspec.yaml. When using split APKs, 1000 * ABI_VERSION
+        // is added automatically by Flutter. (https://developer.android.com/studio/build/configure-apk-splits#configure-APK-versions)
+        // You can force using the value of versionCode by specifying the `-P force-version-code-ignoring-abi=true`
+        // flag during build.
         versionCode = flutter.versionCode
         versionName = flutter.versionName
 
-        // 仅打包 arm64-v8a
+        // 与 main 分支保持一致：仅打包 arm64-v8a
         ndk {
             abiFilters.addAll(listOf("arm64-v8a"))
         }
     }
 
-    // 显式指定 jniLibs 源目录
-    sourceSets {
-        getByName("main") {
-            jniLibs.srcDirs("src/main/jniLibs")
-        }
-    }
-
-    tasks.withType<Copy> {
-        if (name.startsWith("merge") && name.endsWith("JniLibFolders")) {
-            from("src/main/jniLibs")
-            into("$buildDir/intermediates/merged_jni_libs/debug/out")
-        }
-    }
-    // 打包配置
-    packagingOptions {
+    // AGP 9 不再允许在 AndroidManifest 里写 android:extractNativeLibs，
+    // 改为在这里声明，效果等价于原先的“强制提取 .so”
+    packaging {
         jniLibs {
             useLegacyPackaging = true
         }
-        pickFirsts += "**/*.so"
+    }
+
+    // AGP 9 默认关闭 resValue 生成，这里显式打开（debug 需要 "清听 Dev" 的应用名）
+    buildFeatures {
+        resValues = true
+    }
+
+    signingConfigs {
+        create("release") {
+            if (hasReleaseKeystore) {
+                keyAlias = keystoreProperties.getProperty("keyAlias")
+                keyPassword = keystoreProperties.getProperty("keyPassword")
+                storeFile = rootProject.file(keystoreProperties.getProperty("storeFile"))
+                storePassword = keystoreProperties.getProperty("storePassword")
+            }
+        }
     }
 
     buildTypes {
         debug {
+            // 测试包与正式包并存安装：com.lxh.qingting_player.dev
+            // 说明：Android 包名每一段必须以字母开头，所以没法直接写 "_dev"，
+            // 这里用 ".dev" 后缀，等价于给 debug 打上 dev 标记。
+            applicationIdSuffix = ".dev"
+            resValue("string", "app_name", "清听 Dev")
         }
-
         release {
-            signingConfig = signingConfigs.getByName("debug")
-            proguardFiles(
-                getDefaultProguardFile("proguard-android-optimize.txt"),
-                "proguard-rules.pro"
-            )
+            resValue("string", "app_name", "清听")
+            // 有 key.properties 就用正式签名，否则回退 debug（仅本机调试用）
+            signingConfig = if (hasReleaseKeystore) {
+                signingConfigs.getByName("release")
+            } else {
+                signingConfigs.getByName("debug")
+            }
         }
     }
 }

android/app/proguard-rules.pro

@@ -1,45 +0,0 @@
-# ============================================================
-# media_kit 核心
-# ============================================================
--keep class com.media_kit.** { *; }
--keep class com.alexmercerind.** { *; }
--keep class org.mozilla.** { *; }
-
-# 保留所有 native 方法
--keepclasseswithmembernames class * {
-    native <methods>;
-}
-
-# 保留所有 JNI 相关
--keep class * implements java.lang.reflect.Method { *; }
--keep class * extends java.lang.reflect.Method { *; }
-
-# ============================================================
-# audio_service 插件
-# ============================================================
--keep class com.ryanheise.audioservice.** { *; }
-
-# ============================================================
-# Flutter 核心
-# ============================================================
--keep class io.flutter.** { *; }
--keep class io.flutter.plugin.** { *; }
--keep class io.flutter.embedding.** { *; }
-
-# ============================================================
-# 忽略 Google Play Core 缺失类（如果不想添加依赖）
-# ============================================================
--dontwarn com.google.android.play.core.**
--keep class com.google.android.play.core.** { *; }
-
-# ============================================================
-# 保留 Serializable 支持
-# ============================================================
--keepclassmembers class * implements java.io.Serializable {
-    static final long serialVersionUID;
-    private static final java.io.ObjectStreamField[] serialPersistentFields;
-    private void writeObject(java.io.ObjectOutputStream);
-    private void readObject(java.io.ObjectInputStream);
-    java.lang.Object writeReplace();
-    java.lang.Object readResolve();
-}

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,6 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.lxh.qingting_player">
-
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- package 由 build.gradle.kts 的 namespace / applicationId 决定；AGP 9 已忽略这里的 package 属性 -->
+        <!-- 权限 -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
@@ -12,11 +12,9 @@
     <application
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher"
-        android:label="清听"
+        android:label="@string/app_name"
         android:usesCleartextTraffic="true"
-        android:foregroundServiceType="mediaPlayback"
-        android:extractNativeLibs="true">   <!-- ⭐ 强制提取 .so，避免压缩后加载失败 -->
-
+        android:foregroundServiceType="mediaPlayback">
         <activity
             android:name=".MainActivity"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
@@ -34,8 +32,7 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-
-        <!-- AudioService -->
+        <!-- ⭐ AudioService（不加 meta-data） -->
         <service
             android:name="com.ryanheise.audioservice.AudioService"
             android:exported="true"
@@ -45,8 +42,9 @@
                 <action android:name="android.intent.action.MEDIA_BUTTON" />
             </intent-filter>
         </service>
-
-        <!-- MediaButtonReceiver -->
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <!-- ⭐ MediaButtonReceiver -->
         <receiver
             android:name="com.ryanheise.audioservice.MediaButtonReceiver"
             android:exported="true">
@@ -55,7 +53,7 @@
             </intent-filter>
         </receiver>
 
-        <!-- FileProvider for artwork（已配置，保持不变） -->
+        <!-- ⭐ FileProvider -->
         <provider
             android:name="androidx.core.content.FileProvider"
             android:authorities="${applicationId}.fileprovider"
@@ -70,12 +68,15 @@
             android:name="flutterEmbedding"
             android:value="2" />
     </application>
+    <!-- Required to query activities that can process text, see:
+         https://developer.android.com/training/package-visibility and
+         https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
 
+         In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
     <queries>
         <intent>
             <action android:name="android.intent.action.PROCESS_TEXT"/>
             <data android:mimeType="text/plain"/>
         </intent>
     </queries>
-
 </manifest>

android/app/src/main/kotlin/com/example/qingting_player/MainActivity.kt

@@ -4,38 +4,26 @@ import android.os.Build
 import android.os.Bundle
 import android.util.Log
 import androidx.core.content.FileProvider
-import io.flutter.embedding.android.FlutterActivity
+import com.ryanheise.audioservice.AudioServiceActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.MethodChannel
 import java.io.File
 import android.content.Context
 import android.media.AudioManager
 
-class MainActivity : FlutterActivity() {
+// 必须继承 AudioServiceActivity，而不是 FlutterActivity：
+// audio_service 0.18.x 会把 Dart 入口跑在一个单独的缓存引擎（audio_service_engine）里。
+// 若这里用 FlutterActivity，Activity 会自建第二个 FlutterEngine，
+// main() 因此被跑两遍，产生两个 PlaybackService / 两个 media_kit Player（libmpv 多实例），
+// 表现为两路声音、通知栏控制的是另一个实例。
+// AudioServiceActivity 通过 provideFlutterEngine() 复用同一个缓存引擎，保证全局只有一个 Player。
+class MainActivity : AudioServiceActivity() {
 
     private val CHANNEL = "com.lxh.qingting_player/file_provider"
 
     override fun onCreate(savedInstanceState: Bundle?) {
-        // ⭐ 强制加载 libmediakitandroidhelper.so，触发 JNI_OnLoad，缓存 JavaVM
-        try {
-            System.loadLibrary("mediakitandroidhelper")
-            Log.d("MainActivity", "✅ libmediakitandroidhelper loaded")
-        } catch (e: UnsatisfiedLinkError) {
-            Log.e("MainActivity", "❌ libmediakitandroidhelper load failed", e)
-        }
-
-        // ⭐ 可选：预加载 libmpv.so（让系统 linker 也可见，增强兼容性）
-        try {
-            System.loadLibrary("mpv")
-            Log.d("MainActivity", "✅ libmpv loaded")
-        } catch (e: UnsatisfiedLinkError) {
-            Log.e("MainActivity", "❌ libmpv load failed", e)
-        }
-
         super.onCreate(savedInstanceState)
-
         requestAudioFocus()
-
         setHighRefreshRate()
     }
 
@@ -63,7 +51,7 @@ class MainActivity : FlutterActivity() {
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
         super.configureFlutterEngine(flutterEngine)
 
-        // FileProvider MethodChannel for sharing artwork via content:// URI
+        // FileProvider MethodChannel
         MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL)
             .setMethodCallHandler { call, result ->
                 if (call.method == "getContentUri") {

android/gradle.properties

@@ -3,6 +3,7 @@ android.useAndroidX=true
 # This newDsl flag was added by the Flutter template
 android.newDsl=false
 # This builtInKotlin flag was added by the Flutter template
+android.builtInKotlin=false
+# 本机 Kotlin 守护进程连不上（fallback 编译），且增量缓存易损坏，沿用 main 分支原有的设置
 kotlin.incremental=false
 kotlin.parallel.tasks.in.project=false
-android.builtInKotlin=false

android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://mirrors.cloud.tencent.com/gradle/gradle-9.1.0-all.zip
+distributionUrl=https\://mirrors.cloud.tencent.com/gradle/gradle-9.3.1-all.zip

android/qt_player_android.iml

@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="android" name="Android">
-      <configuration>
-        <option name="ALLOW_USER_CONFIGURATION" value="false" />
-        <option name="GEN_FOLDER_RELATIVE_PATH_APT" value="/gen" />
-        <option name="GEN_FOLDER_RELATIVE_PATH_AIDL" value="/gen" />
-        <option name="MANIFEST_FILE_RELATIVE_PATH" value="/app/src/main/AndroidManifest.xml" />
-        <option name="RES_FOLDER_RELATIVE_PATH" value="/app/src/main/res" />
-        <option name="ASSETS_FOLDER_RELATIVE_PATH" value="/app/src/main/assets" />
-        <option name="LIBS_FOLDER_RELATIVE_PATH" value="/app/src/main/libs" />
-        <option name="PROGUARD_LOGS_FOLDER_RELATIVE_PATH" value="/app/src/main/proguard_logs" />
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/app/src/main/java" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/app/src/main/kotlin" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/gen" isTestSource="false" generated="true" />
-    </content>
-    <orderEntry type="jdk" jdkName="Android API 24 Platform" jdkType="Android SDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Flutter for Android" level="project" />
-    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
-  </component>
-</module>

android/settings.gradle.kts

@@ -19,8 +19,8 @@ pluginManagement {
 
 plugins {
     id("dev.flutter.flutter-plugin-loader") version "1.0.0"
-    id("com.android.application") version "9.0.1" apply false
-    id("org.jetbrains.kotlin.android") version "2.3.20" apply false
+    id("com.android.application") version "9.1.0" apply false
+    id("org.jetbrains.kotlin.android") version "2.4.0" apply false
 }
 
 include(":app")

lib/audio/player_controller.dart

@@ -1,32 +0,0 @@
-// lib/audio/player_controller.dart
-import '../services/playback_service.dart'; // ⭐ 修正路径
-
-class PlayerController {
-  static final PlayerController _instance = PlayerController._internal();
-  factory PlayerController() => _instance;
-  PlayerController._internal();
-
-  final PlaybackService _playback = PlaybackService();
-
-  // ---- 状态流（只读） ----
-  Stream<bool> get playingStream => _playback.player.stream.playing;
-  Stream<Duration> get positionStream => _playback.player.stream.position;
-  Stream<Duration> get durationStream => _playback.player.stream.duration;
-  Stream<void> get completedStream => _playback.player.stream.completed;
-
-  // ---- 当前状态快照 ----
-  bool get isPlaying => _playback.player.state.playing;
-  Duration get position => _playback.player.state.position;
-  Duration get duration => _playback.player.state.duration;
-
-  // ---- 控制命令 ----
-  Future<void> play() => _playback.resume();
-  Future<void> pause() => _playback.pause();
-  Future<void> stop() => _playback.stop();
-  Future<void> seek(Duration position) => _playback.seek(position);
-
-  // ---- 加载歌曲 ----
-  void load(String url, {Map<String, String>? headers}) {
-    _playback.play(url, headers: headers);
-  }
-}

lib/database/song_database.dart

@@ -27,7 +27,7 @@ class SongDatabase {
     _log('📂 数据库路径: $path');
     return await openDatabase(
       path,
-      version: 4, // 升级版本号
+      version: 6, // v6：song_key 改为纯 URL 的 md5（配合分阶段探测）
       onCreate: _onCreate,
       onUpgrade: _onUpgrade,
     );
@@ -226,6 +226,14 @@ class SongDatabase {
         await _createPlaybackStateTable(db);
       }
     }
+    // ⭐ 升级到版本 5：song_key 由 String.hashCode 改为 md5(url|size|mtime)。
+    // 旧键带进程级随机种子、无法换算；songs / metadata_cache 都是可再生的缓存，
+    // 直接清空，下次播放时按需重建。歌单与收藏按路径（song_id）存储，不受影响。
+    if (oldVersion < 6) {
+      await db.delete('metadata_cache');
+      await db.delete('songs');
+      _log('🧹 已清空 songs / metadata_cache（song_key 算法升级）');
+    }
     _log('✅ 数据库升级完成');
   }
 
@@ -248,6 +256,33 @@ class SongDatabase {
     return result.isNotEmpty ? result.first : null;
   }
 
+  /// 批量按路径查元数据，返回 path -> row。
+  /// 文件列表页一次要显示几十上百首，逐条查会太慢。
+  Future<Map<String, Map<String, dynamic>>> getSongsByPaths(
+      List<String> paths) async {
+    final result = <String, Map<String, dynamic>>{};
+    if (paths.isEmpty) return result;
+
+    final db = await database;
+    const chunkSize = 400; // 避免 SQLite 变量数量上限
+    for (var i = 0; i < paths.length; i += chunkSize) {
+      final end = (i + chunkSize) > paths.length ? paths.length : i + chunkSize;
+      final slice = paths.sublist(i, end);
+      final placeholders = List.filled(slice.length, '?').join(',');
+      final rows = await db.query(
+        'songs',
+        where: 'remote_path IN ($placeholders)',
+        whereArgs: slice,
+      );
+      for (final row in rows) {
+        final path = row['remote_path'] as String?;
+        if (path != null) result[path] = row;
+      }
+    }
+    _logQuery('songs', 'getByPaths', args: {'count': result.length});
+    return result;
+  }
+
   Future<Map<String, dynamic>?> getSongByHash(String contentHash) async {
     _logQuery('songs', 'getByHash', args: {'content_hash': contentHash});
     final db = await database;

lib/main.dart

@@ -54,6 +54,8 @@ void main() async {
   try {
     _audioHandler = AudioPlayerHandler();
     debugPrint('⏱️ T0.62 AudioPlayerHandler created');
+    // ⭐ 将 Handler 注入到 AudioService
+    AudioService().setHandler(_audioHandler!);
   } catch (e, st) {
     debugPrint('❌ AudioPlayerHandler failed: $e');
     debugPrint('$st');

lib/metadata/file_provider.dart

@@ -1,60 +1,128 @@
 // lib/metadata/file_provider.dart
 import 'dart:io';
-import 'package:flutter/foundation.dart'; // ⭐ 添加
+import 'package:flutter/foundation.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:dio/dio.dart';
 import '../services/webdav_service.dart';
+import '../utils/song_key.dart';
 
 abstract class FileProvider {
-  Future<File?> getFile(String url);
+  /// [maxBytes] 是只取文件头部的上限（本地文件实现会忽略它）。
+  Future<File?> getFile(String url, {int maxBytes = 512 * 1024});
 }
 
 class WebDAVFileProvider implements FileProvider {
+  /// 只为读标签取文件头部，绝不整文件下载。
+  /// 之前用 dio.download 会把整首歌拉到临时目录，和 mpv 的流式播放抢带宽，
+  /// 20Mbps 的 FRP 链路上尤其明显（表现为流量很高但缓冲一直为 0）。
+  ///
+  /// 从访问日志看：2MB 的探测请求在这条链路上要 10~18 秒，
+  /// 期间 libmpv 的 206 吞吐会被压到 1Mbps 左右，所以压到 512KB。
+  /// 常见标签 + 封面都在这范围内；读不到时由上层在 80% 处重试。
+  static const int defaultMaxBytes = 512 * 1024;
+
+  /// 切歌时取消上一次未完成的下载，避免多个下载叠加占满带宽。
+  static CancelToken? _activeToken;
+
   final Dio _dio = Dio();
 
   @override
-  Future<File?> getFile(String url) async {
+  Future<File?> getFile(String url, {int maxBytes = defaultMaxBytes}) async {
     try {
-      // 1. 获取缓存目录
       final cacheDir = await getTemporaryDirectory();
-      final cachePath = '${cacheDir.path}/metadata_${url.hashCode}.tmp';
+      final cachePath =
+          '${cacheDir.path}/metadata_${songKeyForUrl(url)}_${maxBytes ~/ 1024}k.part';
       final cacheFile = File(cachePath);
 
-      // 2. 如果缓存存在且未过期，直接返回
+      // 1. 命中本地缓存（头部文件同样按 24h 过期）
       if (await cacheFile.exists()) {
         final stat = await cacheFile.stat();
-        // 缓存 1 小时内有效（86400 秒）
-        if (DateTime.now().difference(stat.modified).inSeconds < 86400) {
+        if (stat.size > 0 &&
+            DateTime.now().difference(stat.modified).inSeconds < 86400) {
           return cacheFile;
         }
       }
 
-      // 3. 获取认证头
+      // 2. 认证头
       final headers = await WebDAVService.instance.getAuthHeaders();
       if (headers.isEmpty) return null;
 
-      // 4. 只下载前 1MB
-      await _dio.download(
+      // 3. 取消上一次未完成的下载
+      _activeToken?.cancel('superseded');
+      final token = CancelToken();
+      _activeToken = token;
+
+      // 4. 只请求前 2MB
+      final response = await _dio.get<ResponseBody>(
         url,
-        cachePath,
+        cancelToken: token,
         options: Options(
-          headers: headers,
-          receiveTimeout: const Duration(seconds: 10),
+          headers: {
+            ...headers,
+            'Range': 'bytes=0-${maxBytes - 1}',
+          },
+          responseType: ResponseType.stream,
+          receiveTimeout: const Duration(seconds: 15),
           sendTimeout: const Duration(seconds: 10),
+          followRedirects: true,
         ),
       );
 
+      final body = response.data;
+      if (body == null) return null;
+
+      // 5. 写入临时文件（最多 _maxBytes）
+      final sink = cacheFile.openWrite();
+      var written = 0;
+      try {
+        await for (final chunk in body.stream) {
+          final remain = maxBytes - written;
+          if (remain <= 0) break;
+          final data =
+              chunk.lengthInBytes > remain ? chunk.sublist(0, remain) : chunk;
+          sink.add(data);
+          written += data.lengthInBytes;
+          if (written >= maxBytes) break;
+        }
+      } finally {
+        await sink.flush();
+        await sink.close();
+      }
+
+      if (written == 0) {
+        try {
+          await cacheFile.delete();
+        } catch (_) {}
+        return null;
+      }
+
+      debugPrint(
+          '📦 [WebDAVFileProvider] 取头部 ${(written / 1024).toStringAsFixed(0)}KB'
+          '（上限 ${maxBytes ~/ 1024}KB，不再整文件下载）');
       return cacheFile;
+    } on DioException catch (e) {
+      if (CancelToken.isCancel(e)) {
+        debugPrint('↩️ [WebDAVFileProvider] 下载已取消（切歌触发）');
+        return null;
+      }
+      debugPrint('⚠️ [WebDAVFileProvider] download failed: $e');
+      return null;
     } catch (e) {
       debugPrint('⚠️ [WebDAVFileProvider] download failed: $e');
       return null;
     }
   }
+
+  /// 主动取消进行中的元数据下载（切歌时可由上层调用）。
+  static void cancelActive() {
+    _activeToken?.cancel('superseded');
+    _activeToken = null;
+  }
 }
 
 class LocalFileProvider implements FileProvider {
   @override
-  Future<File?> getFile(String url) async {
+  Future<File?> getFile(String url, {int maxBytes = 512 * 1024}) async {
     final file = File(url);
     if (await file.exists()) {
       return file;

lib/metadata/metadata_model.dart

@@ -57,6 +57,12 @@ class NormalizedMetadata {
   final Duration? duration;
   final Uint8List? artwork;
 
+  /// 字段来源：true 表示来自标签，false 表示从文件名/路径推断。
+  /// 置信度模型需要区分这两者——"标签里的标题"和"文件名当标题"价值完全不同。
+  final bool titleFromTag;
+  final bool artistFromTag;
+  final bool albumFromTag;
+
   const NormalizedMetadata({
     this.title = '',
     this.artist = '',
@@ -70,6 +76,9 @@ class NormalizedMetadata {
     this.totalDisc = 0,
     this.duration,
     this.artwork,
+    this.titleFromTag = false,
+    this.artistFromTag = false,
+    this.albumFromTag = false,
   });
 
   bool get isEmpty =>

lib/metadata/metadata_normalizer.dart

@@ -4,21 +4,22 @@ import 'metadata_model.dart';
 class MetadataNormalizer {
   NormalizedMetadata normalize(RawMetadata raw,
       {String fileName = '', String filePath = ''}) {
-    final title = raw.title.trim();
-    final artist = raw.artist.trim();
+    final tagTitle = raw.title.trim();
+    final tagArtist = raw.artist.trim();
+    final tagAlbum = raw.album.trim();
 
     final finalTitle =
-        title.isNotEmpty ? title : _inferTitleFromFileName(fileName);
-    final finalArtist =
-        artist.isNotEmpty ? artist : _inferArtistFromPath(filePath);
-    final finalArtist2 = finalArtist.isNotEmpty
-        ? finalArtist
-        : (raw.performers.isNotEmpty ? raw.performers.first : '未知艺术家');
+        tagTitle.isNotEmpty ? tagTitle : _inferTitleFromFileName(fileName);
+
+    final artistFromPath = _inferArtistFromPath(filePath);
+    final finalArtist = tagArtist.isNotEmpty
+        ? tagArtist
+        : (raw.performers.isNotEmpty ? raw.performers.first : artistFromPath);
 
     return NormalizedMetadata(
       title: finalTitle,
-      artist: finalArtist2,
-      album: raw.album,
+      artist: finalArtist,
+      album: tagAlbum,
       genres: raw.genres,
       performers: raw.performers,
       year: raw.year,
@@ -28,6 +29,9 @@ class MetadataNormalizer {
       totalDisc: raw.totalDisc,
       duration: raw.duration,
       artwork: raw.artwork,
+      titleFromTag: tagTitle.isNotEmpty,
+      artistFromTag: tagArtist.isNotEmpty || raw.performers.isNotEmpty,
+      albumFromTag: tagAlbum.isNotEmpty,
     );
   }
 
@@ -49,16 +53,94 @@ class MetadataNormalizer {
     return '未知艺术家';
   }
 
+  /// 置信度评估（元数据引擎第 2 步）。
+  ///
+  /// 设计原则：
+  ///   1. 标签 >= 推断：来自标签的字段永远比文件名/目录推断更可信；
+  ///   2. 字段齐全度：标题、艺术家、专辑依次加分；
+  ///   3. 历史一致性：同一艺人/专辑已有多条可信记录时额外加权，
+  ///      这是"自学习"的入口——库越大，判断越稳；
+  ///   4. 可解释：每个加分项都写进 evidence，方便日志与后续调参。
+  ///
+  /// 分数区间大致：
+  ///   0.35  只有文件名
+  ///   0.55  标题来自标签、艺术家靠推断
+  ///   0.80  标题 + 艺术家都来自标签
+  ///   0.90  标题 + 艺术家 + 专辑
+  ///   0.95  以上再加年份/封面/历史一致性
   CandidateMetadata evaluate(
       NormalizedMetadata normalized, List<Map<String, dynamic>> history) {
-    // 第一版：直接接受，置信度 0.8
+    final evidence = <String, double>{};
+    var confidence = 0.25;
+    evidence['base'] = 0.25;
+
+    if (normalized.title.isNotEmpty) {
+      confidence += 0.20;
+      evidence['title'] = 0.20;
+    }
+    if (normalized.titleFromTag) {
+      confidence += 0.10;
+      evidence['title_from_tag'] = 0.10;
+    } else if (normalized.title.isNotEmpty) {
+      // 拿文件名当标题：明确扣分
+      confidence -= 0.10;
+      evidence['title_inferred_penalty'] = -0.10;
+    }
+
+    if (normalized.artist.isNotEmpty && normalized.artist != '未知艺术家') {
+      confidence += 0.15;
+      evidence['artist'] = 0.15;
+    }
+    if (normalized.artistFromTag) {
+      confidence += 0.10;
+      evidence['artist_from_tag'] = 0.10;
+    }
+
+    if (normalized.album.isNotEmpty) {
+      confidence += 0.10;
+      evidence['album'] = 0.10;
+    }
+    if (normalized.year > 0) {
+      confidence += 0.03;
+      evidence['year'] = 0.03;
+    }
+    if (normalized.artwork != null && normalized.artwork!.isNotEmpty) {
+      confidence += 0.02;
+      evidence['artwork'] = 0.02;
+    }
+
+    // ---- 历史一致性（自学习的核心）----
+    if (history.isNotEmpty) {
+      final sameArtist = history
+          .where((row) => (row['artist'] as String?) == normalized.artist)
+          .length;
+      if (sameArtist >= 2) {
+        confidence += 0.05;
+        evidence['artist_history'] = 0.05;
+      }
+
+      if (normalized.album.isNotEmpty) {
+        final sameAlbum = history
+            .where((row) => (row['album'] as String?) == normalized.album)
+            .length;
+        if (sameAlbum >= 2) {
+          confidence += 0.03;
+          evidence['album_history'] = 0.03;
+        }
+      }
+    }
+
+    confidence = confidence.clamp(0.05, 0.98);
     return CandidateMetadata(
       metadata: normalized,
-      confidence: 0.8,
-      evidence: {'normalized': 0.8},
+      confidence: double.parse(confidence.toStringAsFixed(2)),
+      evidence: evidence,
     );
   }
 
+  /// 按阈值决定最终元数据。
+  /// 低于阈值时仍返回数据（用于展示），但 source 标成 pending，
+  /// 调用方据此累计 validation_count、下次播放重新确认。
   FinalMetadata decide(CandidateMetadata candidate, {double threshold = 0.6}) {
     return FinalMetadata(
       title: candidate.metadata.title,
@@ -76,7 +158,7 @@ class MetadataNormalizer {
       totalDisc: candidate.metadata.totalDisc,
       duration: candidate.metadata.duration,
       artwork: candidate.metadata.artwork,
-      source: 'normalized',
+      source: candidate.confidence >= threshold ? 'normalized' : 'pending',
     );
   }
 }

lib/metadata/metadata_service.dart

@@ -6,9 +6,11 @@ import '../database/song_database.dart';
 import 'metadata_model.dart';
 import 'metadata_reader.dart';
 import 'metadata_normalizer.dart';
+import 'metadata_stability.dart';
 import 'metadata_cache.dart';
 import 'file_provider.dart';
 import '../utils/artwork_helper.dart';
+import '../utils/song_key.dart';
 
 class MetadataService {
   static final MetadataService _instance = MetadataService._internal();
@@ -20,9 +22,8 @@ class MetadataService {
   final MetadataCache _memoryCache = MetadataCache();
   final SongDatabase _db = SongDatabase();
 
-  String _generateSongKey(String url, int fileSize, int modifiedTime) {
-    final raw = '$url|$fileSize|$modifiedTime';
-    return raw.hashCode.toString();
+  String _generateSongKey(String url) {
+    return songKeyFor(url);
   }
 
   FileProvider _getProvider(String url) {
@@ -58,25 +59,39 @@ class MetadataService {
       }
     }
 
-    // 2. 获取文件
+    // 2. 分阶段取头部：先 128KB 拿 title/artist，读不到再补到 512KB。
+    //    弱网下首包更小，标签能更快出来，也少占带宽。
     final provider = _getProvider(url);
-    final file = await provider.getFile(url);
+    var file = await provider.getFile(url, maxBytes: 128 * 1024);
 
     if (file == null || !await file.exists()) {
       debugPrint('⚠️ [MetadataService] file not available, using fallback');
       return _fallbackFromFileName(fileName);
     }
 
-    final stat = await file.stat();
-    final songKey =
-        _generateSongKey(url, stat.size, stat.modified.millisecondsSinceEpoch);
+    var raw = await _reader.readRawMetadata(file);
+    if (raw.title.isEmpty && raw.artist.isEmpty) {
+      debugPrint('📦 [MetadataService] 128KB 没读到标签，补取到 512KB');
+      final bigger = await provider.getFile(url, maxBytes: 512 * 1024);
+      if (bigger != null && await bigger.exists()) {
+        file = bigger;
+        raw = await _reader.readRawMetadata(file);
+      }
+    }
 
-    // 3. SQLite 查询（高置信度直接使用）
+    final stat = await file.stat();
+    final songKey = _generateSongKey(url);
+
+    // 3. SQLite 查询：只有「已验证」的记录才直接返回。
+    //    pending 记录会继续往下走，重新读取并累计 validation_count，
+    //    这就是自修复：置信度不足的记录会在下次播放时被重新确认。
+    Map<String, dynamic>? dbSong;
     if (!forceRefresh) {
-      final dbSong = await _db.getSong(songKey);
+      dbSong = await _db.getSong(songKey);
       if (dbSong != null) {
         final confidence = (dbSong['confidence'] as num?)?.toDouble() ?? 0.0;
-        if (confidence >= 0.6) {
+        final status = dbSong['metadata_status'] as String? ?? 'pending';
+        if (confidence >= 0.6 && status == 'verified') {
           debugPrint(
               '📦 [MetadataService] SQLite hit: ${dbSong['title']} - ${dbSong['artist']}');
 
@@ -105,57 +120,97 @@ class MetadataService {
           await _memoryCache.put(fileId, metadata);
           return metadata;
         }
+        debugPrint('🔁 [MetadataService] 记录未验证'
+            '（conf=${confidence.toStringAsFixed(2)}, status=$status），重新确认');
       }
     }
 
-    // 4. 读取原始 metadata
-    final raw = await _reader.readRawMetadata(file);
-
-    // 5. 标准化
+    // 4. 标准化（raw 已在上面分阶段读取）
     final normalized = _normalizer.normalize(
       raw,
       fileName: fileName,
       filePath: url,
     );
 
-    // 6. 评估
+    // 6. 评估（含历史一致性）
     final history = await _db.getSongsByArtist(normalized.artist, limit: 10);
     final candidate = _normalizer.evaluate(normalized, history);
     final finalMetadata = _normalizer.decide(candidate);
-    debugPrint(
-        '📢 [MetadataService] finalMetadata.artwork is ${finalMetadata.artwork != null ? 'not null (${finalMetadata.artwork!.length} bytes)' : 'null'}');
 
-    // 7. 保存封面图到本地
-    String? artworkPath;
-    if (finalMetadata.artwork != null && finalMetadata.artwork!.isNotEmpty) {
+    // 7. 与已有记录合并（一致性 + 次数由状态机决定）
+    final prevConfidence = (dbSong?['confidence'] as num?)?.toDouble() ?? 0.0;
+    final decision = MetadataStability.decide(
+      previous: dbSong,
+      candidate: candidate,
+      title: finalMetadata.title,
+      artist: finalMetadata.artist,
+    );
+    final validationCount = decision.validationCount;
+    final useNew = dbSong == null || candidate.confidence >= prevConfidence;
+    final effectiveConfidence =
+        useNew ? candidate.confidence : prevConfidence;
+
+    // 8. 保存封面图（只有采用新结果且确实读到图时才写）
+    String? artworkPath = dbSong?['artwork_path'] as String?;
+    if (useNew &&
+        finalMetadata.artwork != null &&
+        finalMetadata.artwork!.isNotEmpty) {
       artworkPath =
           await ArtworkHelper.saveArtwork(finalMetadata.artwork!, songKey);
     }
 
-    // 8. 保存到 SQLite
-    await _db.insertSong({
+    final status = decision.status;
+    debugPrint('🧭 [MetadataService] 状态机: ${decision.reason} → $status'
+        '（validations=$validationCount）');
+
+    final row = <String, dynamic>{
       'song_key': songKey,
-      'remote_path': url,
+      // remote_path 必须存应用内路径（fileId / song.id），不能存完整 URL
+      'remote_path': fileId,
       'file_size': stat.size,
       'modified_time': stat.modified.millisecondsSinceEpoch,
-      'title': finalMetadata.title,
-      'artist': finalMetadata.artist,
-      'album': finalMetadata.album,
-      'genre': finalMetadata.genre,
+      'title': useNew ? finalMetadata.title : (dbSong?['title'] ?? finalMetadata.title),
+      'artist':
+          useNew ? finalMetadata.artist : (dbSong?['artist'] ?? finalMetadata.artist),
+      'album': useNew ? finalMetadata.album : (dbSong?['album'] ?? finalMetadata.album),
+      'genre': useNew ? finalMetadata.genre : (dbSong?['genre'] ?? finalMetadata.genre),
       'artwork_path': artworkPath,
-      'confidence': candidate.confidence,
-      'validation_count': 1,
-      'first_scan': DateTime.now().millisecondsSinceEpoch,
+      'confidence': effectiveConfidence,
+      'validation_count': validationCount,
+      'first_scan':
+          dbSong?['first_scan'] ?? DateTime.now().millisecondsSinceEpoch,
       'last_scan': DateTime.now().millisecondsSinceEpoch,
-      'metadata_status': candidate.confidence >= 0.6 ? 'verified' : 'pending',
-    });
+      'metadata_status': status,
+    };
+
+    if (dbSong == null) {
+      await _db.insertSong(row);
+    } else {
+      await _db.updateSong(songKey, row);
+    }
+
+    final merged = FinalMetadata(
+      title: row['title'] as String? ?? '',
+      artist: row['artist'] as String? ?? '',
+      album: row['album'] as String? ?? '',
+      genre: row['genre'] as String? ?? '',
+      genres: finalMetadata.genres,
+      performers: finalMetadata.performers,
+      year: finalMetadata.year,
+      duration: finalMetadata.duration,
+      artwork: finalMetadata.artwork,
+      source: status,
+    );
 
     // 9. 内存缓存
-    await _memoryCache.put(fileId, finalMetadata);
+    await _memoryCache.put(fileId, merged);
 
-    debugPrint(
-        '✅ [MetadataService] saved: ${finalMetadata.title} - ${finalMetadata.artist} (confidence: ${candidate.confidence})');
-    return finalMetadata;
+    debugPrint('📊 [MetadataService] $status '
+        'conf=${effectiveConfidence.toStringAsFixed(2)} '
+        'validations=$validationCount '
+        'evidence=${candidate.evidence}');
+    debugPrint('✅ [MetadataService] saved: ${merged.title} - ${merged.artist}');
+    return merged;
   }
 
   FinalMetadata _fallbackFromFileName(String fileName) {

lib/metadata/metadata_stability.dart

@@ -0,0 +1,98 @@
+// lib/metadata/metadata_stability.dart
+import 'metadata_model.dart';
+
+/// 状态机判定结果
+class StabilityDecision {
+  /// 'verified' | 'pending'
+  final String status;
+  final String reason;
+  final int validationCount;
+
+  const StabilityDecision({
+    required this.status,
+    required this.reason,
+    required this.validationCount,
+  });
+
+  bool get isVerified => status == 'verified';
+}
+
+/// 元数据状态机：决定一条记录能不能升级为 verified。
+///
+/// 第 2 步的规则是"置信度 >= 0.6 且验证次数 >= 2"，太粗暴：
+/// 两次读到的是不同结果也会被当成"验证通过"。这里加入一致性检查——
+///
+///   - 首次见到 → pending（需要第二次确认）
+///   - 与上次记录冲突（标题或艺术家明显不同）→ 次数重置为 1，继续 pending
+///   - 一致且次数 >= 2、置信度达标 → verified
+///   - 置信度不足 → pending
+///
+/// 这样一次误读不会把错误标签固化，下次播放会重新校正。
+class MetadataStability {
+  static const double threshold = 0.6;
+
+  static StabilityDecision decide({
+    required Map<String, dynamic>? previous,
+    required CandidateMetadata candidate,
+    required String title,
+    required String artist,
+  }) {
+    if (previous == null) {
+      return const StabilityDecision(
+        status: 'pending',
+        reason: 'first_seen',
+        validationCount: 1,
+      );
+    }
+
+    final prevConfidence =
+        (previous['confidence'] as num?)?.toDouble() ?? 0.0;
+    final prevTitle = previous['title'] as String? ?? '';
+    final prevArtist = previous['artist'] as String? ?? '';
+    final prevCount = (previous['validation_count'] as int?) ?? 0;
+
+    final consistent = _similar(prevTitle, title) && _similar(prevArtist, artist);
+    if (!consistent) {
+      return const StabilityDecision(
+        status: 'pending',
+        reason: 'conflict',
+        validationCount: 1,
+      );
+    }
+
+    final count = prevCount + 1;
+    final best = candidate.confidence > prevConfidence
+        ? candidate.confidence
+        : prevConfidence;
+
+    if (best < threshold) {
+      return StabilityDecision(
+        status: 'pending',
+        reason: 'low_confidence',
+        validationCount: count,
+      );
+    }
+
+    if (count < 2) {
+      return StabilityDecision(
+        status: 'pending',
+        reason: 'need_second_validation',
+        validationCount: count,
+      );
+    }
+
+    return StabilityDecision(
+      status: 'verified',
+      reason: 'stable',
+      validationCount: count,
+    );
+  }
+
+  /// 字段缺失不算冲突；只有两边都有值且不同才算。
+  static bool _similar(String a, String b) {
+    final left = a.trim().toLowerCase();
+    final right = b.trim().toLowerCase();
+    if (left.isEmpty || right.isEmpty) return true;
+    return left == right;
+  }
+}

lib/pages/home_page.dart

@@ -2,9 +2,10 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../services/audio_service.dart';
 import '../services/webdav_service.dart';
-import '../services/playback_service.dart';
 import '../widgets/magnetic_scroll_physics.dart';
 import 'webdav_setup_page.dart';
+import 'settings_page.dart';
+import '../database/song_database.dart';
 import 'webdav_file_list_page.dart';
 import '../constants/ui_constants.dart';
 import '../base/base_state.dart';
@@ -34,11 +35,10 @@ class SongItem {
       : fileName.replaceAll(RegExp(r'\.[^.]*$'), '');
 
   String get displaySubtitle {
-    if (metadataState == 'success' && artist != null) {
+    if (metadataState == 'success' && artist != null && artist!.isNotEmpty) {
       return artist!;
-    } else {
-      return sourceTag;
     }
+    return sourceTag.isNotEmpty ? sourceTag : '未知艺术家';
   }
 }
 
@@ -236,7 +236,7 @@ class _HomePageState extends BaseState<HomePage> {
     safeSetState(() => _isLoading = true);
     try {
       await WebDAVService.instance.loadCredentials();
-      _favorites = [];
+      await _loadFavoritesFromDb();
     } catch (e) {
       _favorites = [];
     } finally {
@@ -244,18 +244,62 @@ class _HomePageState extends BaseState<HomePage> {
     }
   }
 
+  /// 收藏列表直接绑定 favorites 表 + songs 元数据
+  Future<void> _loadFavoritesFromDb() async {
+    final db = SongDatabase();
+    final favRows = await db.getFavorites();
+    final paths = favRows
+        .map((row) => row['song_id'] as String?)
+        .whereType<String>()
+        .toList();
+    final meta = await db.getSongsByPaths(paths);
+
+    final items = <SongItem>[];
+    for (final path in paths) {
+      final row = meta[path];
+      final title = (row?['title'] as String?)?.trim() ?? '';
+      final artist = (row?['artist'] as String?)?.trim() ?? '';
+      final hasTitle = title.isNotEmpty;
+
+      // path 是百分号编码的（播放时必须保持），显示前要解码，
+      // 否则没有元数据的收藏会显示成 "13%E6%A5%BC..." 这种不可读串。
+      final rawName = path.split('/').last;
+      String displayName;
+      try {
+        displayName = Uri.decodeComponent(rawName);
+      } catch (_) {
+        displayName = rawName;
+      }
+
+      // 取上级目录名，作为没有标签时的副标题（加括号区分"这是文件夹"）
+      final segments = path.split('/').where((s) => s.isNotEmpty).toList();
+      String folderName = '';
+      if (segments.length >= 2) {
+        try {
+          folderName = Uri.decodeComponent(segments[segments.length - 2]);
+        } catch (_) {
+          folderName = segments[segments.length - 2];
+        }
+      }
+
+      items.add(SongItem(
+        path: path,
+        fileName: displayName,
+        title: hasTitle ? title : null,
+        artist: artist.isNotEmpty ? artist : null,
+        sourceTag: folderName.isNotEmpty ? '($folderName)' : '',
+        metadataState: hasTitle ? 'success' : 'unknown',
+      ));
+    }
+    _favorites = items;
+  }
+
   void _playSong(SongItem song) async {
     try {
-      final url = WebDAVService.instance.getFileUrl(song.path);
-
-      final audioService = context.read<AudioService>();
-      audioService.playSong(Song(
-        id: song.path,
-        title: song.displayTitle,
-        artist: song.displaySubtitle,
-        url: url,
-      ));
-
+      // 先校验登录，再开始播放。
+      // 以前这里是：playSong() 不 await，紧跟着又 PlaybackService().play() 一次，
+      // 同一个 Player 会被 open 两次，media_kit 串行化时第二次会顶掉第一次，
+      // 表现就是"媒体加载了但没有声音"。
       final headers = await WebDAVService.instance.getAuthHeaders();
 
       if (headers.isEmpty) {
@@ -270,7 +314,16 @@ class _HomePageState extends BaseState<HomePage> {
         return;
       }
 
-      await PlaybackService().play(url, headers: headers);
+      if (!mounted) return;
+
+      final url = WebDAVService.instance.getFileUrl(song.path);
+      final audioService = context.read<AudioService>();
+      await audioService.playSong(Song(
+        id: song.path,
+        title: song.displayTitle,
+        artist: song.displaySubtitle,
+        url: url,
+      ));
     } catch (e) {
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
@@ -363,7 +416,14 @@ class _HomePageState extends BaseState<HomePage> {
                   ),
                   IconButton(
                     icon: const Icon(Icons.menu, color: Colors.white54),
-                    onPressed: () {},
+                    onPressed: () {
+                      Navigator.push(
+                        context,
+                        MaterialPageRoute(
+                          builder: (_) => const SettingsPage(),
+                        ),
+                      );
+                    },
                   ),
                 ],
               ),
@@ -406,6 +466,7 @@ class _HomePageState extends BaseState<HomePage> {
                                     builder: (_) => const WebDAVFileListPage(),
                                   ),
                                 );
+                                await _loadFavoritesFromDb();
                                 _resetSnapState();
                                 safeSetState(() {});
                               } else {
@@ -664,12 +725,11 @@ class _HomePageState extends BaseState<HomePage> {
                               delegate: SliverChildBuilderDelegate(
                                 (context, index) {
                                   final song = _favorites[index];
-                                  final itemProgress =
-                                      (_listReveal * 2 - index / 5)
-                                          .clamp(0.0, 1.0);
 
+                                  // 收藏项不做滚动渐显：_listReveal 在首屏为 0，
+                                  // 会让条目完全透明（看起来"收藏了但不显示"）。
                                   return AnimatedOpacity(
-                                    opacity: itemProgress,
+                                    opacity: 1.0,
                                     duration: const Duration(milliseconds: 150),
                                     child: Padding(
                                       padding: const EdgeInsets.symmetric(
@@ -703,13 +763,14 @@ class _HomePageState extends BaseState<HomePage> {
                                         trailing: IconButton(
                                           icon: const Icon(
                                             Icons.favorite,
-                                            color: Color(0xFFB8D4D0),
+                                            color: Color(0xFFE05C5C),
                                             size: 20,
                                           ),
-                                          onPressed: () {
-                                            safeSetState(() {
-                                              _favorites.removeAt(index);
-                                            });
+                                          onPressed: () async {
+                                            await SongDatabase()
+                                                .removeFavorite(song.path);
+                                            await _loadFavoritesFromDb();
+                                            if (mounted) safeSetState(() {});
                                           },
                                         ),
                                         onTap: () => _playSong(song),

lib/pages/playlist_page.dart

@@ -2,6 +2,8 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../services/audio_service.dart';
+import '../database/song_database.dart';
+import '../widgets/song_artwork.dart';
 
 class PlaylistPage extends StatefulWidget {
   const PlaylistPage({super.key});
@@ -17,6 +19,9 @@ class _PlaylistPageState extends State<PlaylistPage> {
   int _scrollGeneration = 0;
   bool _hasScrolledToCurrent = false;
 
+  /// path -> 封面文件路径（来自 songs 表）
+  Map<String, String> _artworkByPath = {};
+
   // ⭐ 固定 item 高度（根据实际 ListTile 测量结果调整）
   // 实际约 72-76px，取 74px 作为稳定值
   static const double _itemExtent = 74.0;
@@ -28,13 +33,46 @@ class _PlaylistPageState extends State<PlaylistPage> {
   @override
   void initState() {
     super.initState();
+    _loadArtworkPaths();
+    AudioService().addListener(_onAudioChanged);
     WidgetsBinding.instance.addPostFrameCallback((_) {
       _scrollToCurrentSong();
     });
   }
 
+  String? _lastArtworkSongId;
+
+  /// 切歌后可能有新歌补全了封面，重新拉一次路径表
+  void _onAudioChanged() {
+    final song = AudioService().currentSong;
+    if (song == null || song.id == _lastArtworkSongId) return;
+    _lastArtworkSongId = song.id;
+    _loadArtworkPaths();
+  }
+
+  /// 批量取封面文件路径，供列表显示
+  Future<void> _loadArtworkPaths() async {
+    try {
+      final queue = AudioService().queue;
+      if (queue.isEmpty) return;
+      final rows =
+          await SongDatabase().getSongsByPaths(queue.map((s) => s.id).toList());
+      final map = <String, String>{};
+      rows.forEach((path, row) {
+        final artwork = row['artwork_path'] as String?;
+        if (artwork != null && artwork.isNotEmpty) map[path] = artwork;
+      });
+      if (mounted && map.isNotEmpty) {
+        setState(() => _artworkByPath = map);
+      }
+    } catch (_) {
+      // 封面只是装饰，失败不影响列表
+    }
+  }
+
   @override
   void dispose() {
+    AudioService().removeListener(_onAudioChanged);
     _scrollController.dispose();
     super.dispose();
   }
@@ -271,11 +309,15 @@ class _PlaylistPageState extends State<PlaylistPage> {
                     horizontal: 8,
                     vertical: 4,
                   ),
-                  leading: Icon(
+                  leading: SongArtwork(
+                    bytes: song.artwork,
+                    filePath: _artworkByPath[song.id],
+                    size: 48,
+                    fallbackIcon:
                         isCurrent ? Icons.play_arrow : Icons.music_note,
-                    color:
-                        isCurrent ? const Color(0xFFB8D4D0) : Colors.grey[600],
-                    size: 24,
+                    fallbackColor: isCurrent
+                        ? const Color(0xFFB8D4D0)
+                        : Colors.grey[600],
                   ),
                   title: Text(
                     song.title,

lib/pages/settings_page.dart

@@ -1,59 +1,367 @@
-import 'package:flutter/material.dart';
+// lib/pages/settings_page.dart
+import 'dart:io';
 
-class SettingsPage extends StatelessWidget {
+import 'package:android_intent_plus/android_intent.dart';
+import 'package:android_intent_plus/flag.dart';
+import 'package:flutter/material.dart';
+import 'package:path_provider/path_provider.dart';
+
+import '../database/song_database.dart';
+import '../services/audio_service.dart';
+import '../services/webdav_service.dart';
+import '../utils/file_provider_utils.dart';
+
+/// 与 pubspec.yaml 的 version 保持同步（发版时一起改）
+const String kAppVersion = '1.1.0-dev.1';
+const int kAppBuild = 2;
+
+class SettingsPage extends StatefulWidget {
   const SettingsPage({super.key});
 
   @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(title: const Text('设置')),
-      body: ListView(
-        children: [
-          const SizedBox(height: 20),
-          _buildTile(
-            icon: Icons.folder_open_outlined,
-            title: '本地文件 (SAF)',
-            subtitle: '通过系统文件选择器导入',
-            onTap: () {
-              // 🟢 这里粘贴你旧项目的 SAF 逻辑
-              ScaffoldMessenger.of(context).showSnackBar(
-                const SnackBar(content: Text('待接入 SAF 逻辑')),
-              );
-            },
+  State<SettingsPage> createState() => _SettingsPageState();
+}
+
+class _SettingsPageState extends State<SettingsPage> {
+  bool _loading = true;
+
+  int _songRows = 0;
+  int _metadataRows = 0;
+  int _favoriteRows = 0;
+  int _artworkCount = 0;
+  int _artworkBytes = 0;
+  int _tempCount = 0;
+  int _tempBytes = 0;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadStats();
+  }
+
+  Future<void> _loadStats() async {
+    setState(() => _loading = true);
+    try {
+      final db = await SongDatabase().database;
+      final songRows =
+          (await db.rawQuery('SELECT COUNT(*) AS c FROM songs')).first['c'];
+      final metaRows = (await db.rawQuery(
+              'SELECT COUNT(*) AS c FROM metadata_cache'))
+          .first['c'];
+      final favRows =
+          (await db.rawQuery('SELECT COUNT(*) AS c FROM favorites')).first['c'];
+
+      var artworkCount = 0, artworkBytes = 0;
+      final docs = await getApplicationDocumentsDirectory();
+      final artDir = Directory('${docs.path}/artworks');
+      if (await artDir.exists()) {
+        await for (final entity in artDir.list()) {
+          if (entity is File) {
+            artworkCount++;
+            artworkBytes += await entity.length();
+          }
+        }
+      }
+
+      var tempCount = 0, tempBytes = 0;
+      final tmp = await getTemporaryDirectory();
+      if (await tmp.exists()) {
+        await for (final entity in tmp.list()) {
+          if (entity is File &&
+              entity.path.contains('/metadata_') &&
+              entity.path.endsWith('.part')) {
+            tempCount++;
+            tempBytes += await entity.length();
+          }
+        }
+      }
+
+      if (!mounted) return;
+      setState(() {
+        _songRows = songRows as int? ?? 0;
+        _metadataRows = metaRows as int? ?? 0;
+        _favoriteRows = favRows as int? ?? 0;
+        _artworkCount = artworkCount;
+        _artworkBytes = artworkBytes;
+        _tempCount = tempCount;
+        _tempBytes = tempBytes;
+        _loading = false;
+      });
+    } catch (e) {
+      debugPrint('⚠️ [Settings] 统计失败: $e');
+      if (mounted) setState(() => _loading = false);
+    }
+  }
+
+  Future<void> _clearMetadataCache() async {
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        backgroundColor: const Color(0xFF1A1F1E),
+        title: const Text('清理元数据缓存', style: TextStyle(color: Colors.white)),
+        content: const Text(
+          '会删除歌曲标签缓存和封面文件，歌单与收藏不受影响。\n下次播放时重新抓取。',
+          style: TextStyle(color: Colors.grey),
         ),
-          _buildTile(
-            icon: Icons.cloud_outlined,
-            title: 'WebDAV 云盘',
-            subtitle: '连接你的 NAS 或网盘',
-            onTap: () {
-              // 🟢 这里调用你现成的 WebDAV 通道
-              ScaffoldMessenger.of(context).showSnackBar(
-                const SnackBar(content: Text('待接入 WebDAV 逻辑')),
-              );
-            },
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('取消'),
           ),
-          _buildTile(
-            icon: Icons.equalizer_outlined,
-            title: '均衡器',
-            subtitle: '简单低音增强 (后续)',
-            onTap: () {},
+          TextButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: const Text('清理', style: TextStyle(color: Colors.redAccent)),
+          ),
+        ],
+      ),
+    );
+    if (confirmed != true) return;
+
+    try {
+      final db = await SongDatabase().database;
+      await db.delete('songs');
+      await db.delete('metadata_cache');
+
+      final docs = await getApplicationDocumentsDirectory();
+      final artDir = Directory('${docs.path}/artworks');
+      if (await artDir.exists()) {
+        await artDir.delete(recursive: true);
+      }
+
+      final tmp = await getTemporaryDirectory();
+      if (await tmp.exists()) {
+        await for (final entity in tmp.list()) {
+          if (entity is File &&
+              entity.path.contains('/metadata_') &&
+              entity.path.endsWith('.part')) {
+            await entity.delete();
+          }
+        }
+      }
+
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(content: Text('元数据缓存已清理')),
+        );
+      }
+      await _loadStats();
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context)
+            .showSnackBar(SnackBar(content: Text('清理失败: $e')));
+      }
+    }
+  }
+
+  Future<void> _exportDiagnostics() async {
+    try {
+      final now = DateTime.now();
+      final docs = await getApplicationDocumentsDirectory();
+      final file =
+          File('${docs.path}/diagnostics-${now.millisecondsSinceEpoch}.txt');
+
+      final song = AudioService().currentSong;
+      final buffer = StringBuffer()
+        ..writeln('清听 诊断信息')
+        ..writeln('时间: ${now.toIso8601String()}')
+        ..writeln('版本: $kAppVersion ($kAppBuild)')
+        ..writeln('平台: ${Platform.operatingSystem} ${Platform.operatingSystemVersion}')
+        ..writeln()
+        ..writeln('[连接]')
+        ..writeln('baseUrl: ${WebDAVService.instance.baseUrl ?? '(未配置)'}')
+        ..writeln('username: ${WebDAVService.instance.username ?? '(未配置)'}')
+        ..writeln('connected: ${WebDAVService.instance.isConnected}')
+        ..writeln()
+        ..writeln('[数据]')
+        ..writeln('songs: $_songRows')
+        ..writeln('metadata_cache: $_metadataRows')
+        ..writeln('favorites: $_favoriteRows')
+        ..writeln('artwork 文件: $_artworkCount 个 / ${_formatBytes(_artworkBytes)}')
+        ..writeln('临时探测文件: $_tempCount 个 / ${_formatBytes(_tempBytes)}')
+        ..writeln()
+        ..writeln('[当前播放]')
+        ..writeln('song: ${song?.title ?? '(无)'} - ${song?.artist ?? ''}')
+        ..writeln('path: ${song?.id ?? ''}')
+        ..writeln('position: ${AudioService().position}')
+        ..writeln('duration: ${AudioService().duration}')
+        ..writeln('lastError: ${AudioService().lastPlaybackError ?? '(无)'}');
+
+      await file.writeAsString(buffer.toString());
+      if (!mounted) return;
+
+      final uri = await FileProviderUtils.getContentUri(file);
+      if (uri != null) {
+        try {
+          final intent = AndroidIntent(
+            action: 'android.intent.action.SEND',
+            type: 'text/plain',
+            arguments: {
+              'android.intent.extra.STREAM': uri.toString(),
+              'android.intent.extra.SUBJECT': '清听诊断信息',
+            },
+            flags: const [Flag.FLAG_GRANT_READ_URI_PERMISSION],
+          );
+          await intent.launch();
+          return;
+        } catch (e) {
+          debugPrint('⚠️ [Settings] 分享失败: $e');
+        }
+      }
+
+      if (mounted) {
+        showDialog<void>(
+          context: context,
+          builder: (context) => AlertDialog(
+            backgroundColor: const Color(0xFF1A1F1E),
+            title: const Text('诊断信息已导出', style: TextStyle(color: Colors.white)),
+            content: SelectableText(
+              file.path,
+              style: const TextStyle(color: Colors.grey, fontSize: 12),
+            ),
+            actions: [
+              TextButton(
+                onPressed: () => Navigator.pop(context),
+                child: const Text('好'),
               ),
             ],
           ),
         );
       }
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context)
+            .showSnackBar(SnackBar(content: Text('导出失败: $e')));
+      }
+    }
   }
 
-Widget _buildTile(
-    {required IconData icon,
-    required String title,
-    required String subtitle,
-    required VoidCallback onTap}) {
-  return ListTile(
-    leading: Icon(icon, color: const Color(0xFF7C9A9E)),
-    title: Text(title),
-    subtitle: Text(subtitle, style: const TextStyle(fontSize: 12)),
-    trailing: const Icon(Icons.chevron_right, color: Colors.grey),
-    onTap: onTap,
+  Future<void> _testConnection() async {
+    try {
+      await WebDAVService.instance.listDirectory(path: '/');
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(content: Text('连接正常')),
         );
       }
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text('连接失败: $e')),
+        );
+      }
+    }
+  }
+
+  Future<void> _logout() async {
+    await WebDAVService.instance.clearCredentials();
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('已退出登录，下次进入会要求重新配置')),
+      );
+    }
+  }
+
+  String _formatBytes(int bytes) {
+    if (bytes < 1024) return '$bytes B';
+    if (bytes < 1024 * 1024) return '${(bytes / 1024).toStringAsFixed(1)} KB';
+    return '${(bytes / 1024 / 1024).toStringAsFixed(1)} MB';
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: const Color(0xFF0E1211),
+      appBar: AppBar(
+        backgroundColor: Colors.transparent,
+        elevation: 0,
+        title: const Text('设置'),
+      ),
+      body: _loading
+          ? const Center(child: CircularProgressIndicator())
+          : ListView(
+              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+              children: [
+                _sectionTitle('缓存'),
+                ListTile(
+                  leading: const Icon(Icons.cleaning_services_outlined,
+                      color: Color(0xFF7C9A9E)),
+                  title: const Text('元数据缓存'),
+                  subtitle: Text(
+                    '标签 $_songRows 首 · 封面 $_artworkCount 张 '
+                    '(${_formatBytes(_artworkBytes)}) · 临时文件 ${_formatBytes(_tempBytes)}',
+                    style: const TextStyle(fontSize: 12),
+                  ),
+                  trailing: const Icon(Icons.chevron_right, color: Colors.grey),
+                  onTap: _clearMetadataCache,
+                ),
+                _sectionTitle('诊断'),
+                ListTile(
+                  leading: const Icon(Icons.bug_report_outlined,
+                      color: Color(0xFF7C9A9E)),
+                  title: const Text('导出诊断信息'),
+                  subtitle: const Text(
+                    '版本、连接状态、缓存统计、当前播放与最近错误',
+                    style: TextStyle(fontSize: 12),
+                  ),
+                  trailing: const Icon(Icons.ios_share, color: Colors.grey),
+                  onTap: _exportDiagnostics,
+                ),
+                _sectionTitle('连接'),
+                ListTile(
+                  leading: const Icon(Icons.cloud_outlined,
+                      color: Color(0xFF7C9A9E)),
+                  title: Text(WebDAVService.instance.baseUrl ?? '(未配置)'),
+                  subtitle: Text(
+                    '用户 ${WebDAVService.instance.username ?? '-'} · '
+                    '${WebDAVService.instance.isConnected ? '已连接' : '未连接'}',
+                    style: const TextStyle(fontSize: 12),
+                  ),
+                ),
+                ListTile(
+                  leading: const Icon(Icons.wifi_tethering,
+                      color: Color(0xFF7C9A9E)),
+                  title: const Text('测试连接'),
+                  onTap: _testConnection,
+                ),
+                ListTile(
+                  leading:
+                      const Icon(Icons.logout, color: Colors.redAccent),
+                  title: const Text('退出登录'),
+                  subtitle: const Text(
+                    '清除本机保存的 WebDAV 账号',
+                    style: TextStyle(fontSize: 12),
+                  ),
+                  onTap: _logout,
+                ),
+                _sectionTitle('关于'),
+                ListTile(
+                  leading:
+                      const Icon(Icons.info_outline, color: Color(0xFF7C9A9E)),
+                  title: const Text('清听'),
+                  subtitle: const Text(
+                    '版本 $kAppVersion ($kAppBuild)\n'
+                    '播放内核 media_kit (libmpv, LGPL/GPL) · UI Flutter (BSD)',
+                    style: TextStyle(fontSize: 12),
+                  ),
+                ),
+                const SizedBox(height: 24),
+              ],
+            ),
+    );
+  }
+
+  Widget _sectionTitle(String text) {
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(4, 20, 4, 8),
+      child: Text(
+        text,
+        style: const TextStyle(
+          fontSize: 13,
+          fontWeight: FontWeight.w600,
+          color: Color(0xFFB8D4D0),
+          letterSpacing: 1.2,
+        ),
+      ),
+    );
+  }
+}

lib/pages/webdav_file_list_page.dart

@@ -4,6 +4,9 @@ import '../services/webdav_service.dart';
 import '../constants/ui_constants.dart';
 import '../base/base_state.dart';
 import '../controllers/playback_controller.dart';
+import '../database/song_database.dart';
+import '../services/audio_service.dart';
+import '../widgets/song_artwork.dart';
 
 class WebDAVFileListPage extends StatefulWidget {
   final String currentPath;
@@ -20,6 +23,13 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
   String _errorMessage = '';
   String _currentPath = '/';
 
+  /// path -> 元数据行（songs 表），用于把文件名替换成标签里的标题/艺术家
+  Map<String, Map<String, dynamic>> _metaByPath = {};
+  String? _lastSyncedSongPath;
+
+  /// 已收藏的歌曲路径
+  Set<String> _favoritePaths = {};
+
   // 安全解码
   String _safeDecode(String input) {
     try {
@@ -33,9 +43,59 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
   void initState() {
     super.initState();
     _currentPath = widget.currentPath;
+    AudioService().addListener(_onPlaybackChanged);
     _loadDirectory();
   }
 
+  @override
+  void dispose() {
+    AudioService().removeListener(_onPlaybackChanged);
+    super.dispose();
+  }
+
+  /// 播放中的歌一旦补全了元数据，立刻刷新列表里对应的那一行
+  void _onPlaybackChanged() {
+    final path = AudioService().currentSong?.id;
+    if (path == null || path == _lastSyncedSongPath) return;
+    _lastSyncedSongPath = path;
+    _syncMetadataFor(path);
+  }
+
+  Future<void> _syncMetadataFor(String path) async {
+    if (!_items.any((item) => item.path == path)) return;
+    final row = await SongDatabase().getSongByPath(path);
+    if (row == null || !mounted) return;
+    final title = (row['title'] as String?)?.trim() ?? '';
+    if (title.isEmpty) return;
+    safeSetState(() {
+      _metaByPath = {..._metaByPath, path: row};
+    });
+  }
+
+  /// 收藏 / 取消收藏：整行点击是播放，右侧红心专门做收藏
+  Future<void> _toggleFavorite(String path) async {
+    final wasFavorite = _favoritePaths.contains(path);
+    try {
+      await SongDatabase().toggleFavorite(path);
+      if (!mounted) return;
+      safeSetState(() {
+        final next = {..._favoritePaths};
+        if (wasFavorite) {
+          next.remove(path);
+        } else {
+          next.add(path);
+        }
+        _favoritePaths = next;
+      });
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text('收藏失败: $e')),
+        );
+      }
+    }
+  }
+
   // ============================================================
   // 加载目录
   // ============================================================
@@ -48,11 +108,40 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
     try {
       final items =
           await WebDAVService.instance.listDirectory(path: _currentPath);
+
+      // 一次性把本目录下所有文件的元数据查出来，列表直接用标签显示
+      final paths = items
+          .where((item) => !item.isDirectory)
+          .map((item) => item.path)
+          .toList();
+      var meta = <String, Map<String, dynamic>>{};
+      try {
+        meta = await SongDatabase().getSongsByPaths(paths);
+      } catch (e) {
+        debugPrint('⚠️ [WebDAVList] 批量读取元数据失败: $e');
+      }
+
+      var favorites = <String>{};
+      try {
+        final favRows = await SongDatabase().getFavorites();
+        favorites = favRows
+            .map((row) => row['song_id'] as String?)
+            .whereType<String>()
+            .toSet();
+      } catch (e) {
+        debugPrint('⚠️ [WebDAVList] 读取收藏失败: $e');
+      }
+
       if (mounted) {
         safeSetState(() {
           _items = items;
+          _metaByPath = meta;
+          _favoritePaths = favorites;
           _isLoading = false;
         });
+        // 如果当前正在播的歌就在这个目录里，补一次同步
+        _lastSyncedSongPath = null;
+        _onPlaybackChanged();
       }
     } catch (e) {
       if (mounted) {
@@ -295,15 +384,27 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
       final sizeStr = item.size != null
           ? '${(item.size! / 1024 / 1024).toStringAsFixed(1)} MB'
           : '';
+      // 有标签就用标签，没有才退回文件名（例如新歌尚未抓取元数据）
+      final meta = _metaByPath[item.path];
+      final metaTitle = (meta?['title'] as String?)?.trim() ?? '';
+      final metaArtist = (meta?['artist'] as String?)?.trim() ?? '';
+      final hasMeta = metaTitle.isNotEmpty;
+      final titleText = hasMeta ? metaTitle : displayName;
+      final subtitleText = [
+        if (hasMeta && metaArtist.isNotEmpty && metaArtist != '未知艺术家')
+          metaArtist,
+        if (sizeStr.isNotEmpty) sizeStr,
+      ].join(' · ');
+
       return ListTile(
         contentPadding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
-        leading: const Icon(
-          Icons.audiotrack,
-          color: Color(0xFFB8D4D0),
-          size: 28,
+        leading: SongArtwork(
+          filePath: meta?['artwork_path'] as String?,
+          size: 44,
+          fallbackIcon: Icons.audiotrack,
         ),
         title: Text(
-          displayName,
+          titleText,
           style: const TextStyle(
             fontSize: 16,
             fontWeight: FontWeight.w400,
@@ -313,15 +414,23 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
           overflow: TextOverflow.ellipsis,
         ),
         subtitle: Text(
-          sizeStr,
+          subtitleText,
           style: TextStyle(
             fontSize: 12,
             color: Colors.grey[500],
           ),
         ),
         trailing: IconButton(
-          icon: const Icon(Icons.play_arrow, color: Color(0xFFB8D4D0)),
-          onPressed: () => _playSong(item),
+          tooltip: '收藏',
+          icon: Icon(
+            _favoritePaths.contains(item.path)
+                ? Icons.favorite
+                : Icons.favorite_border,
+            color: _favoritePaths.contains(item.path)
+                ? const Color(0xFFE05C5C)
+                : Colors.grey,
+          ),
+          onPressed: () => _toggleFavorite(item.path),
         ),
         onTap: () => _playSong(item),
       );

lib/services/audio_player_handler.dart

@@ -4,49 +4,62 @@ import 'dart:typed_data';
 import 'package:flutter/foundation.dart';
 import 'package:path_provider/path_provider.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';
-import '../utils/file_provider_utils.dart';
-import 'dart:convert';
 import 'package:crypto/crypto.dart';
+import 'dart:convert';
 
+import 'playback_service.dart';
+import 'audio_service.dart';
+import '../utils/file_provider_utils.dart';
+
+/// 音频服务处理器：连接 media_kit 播放引擎与 Android 系统媒体会话
+/// 职责：发布播放状态到系统通知栏，接收系统媒体按钮事件
+/// 它不拥有 Player 实例，所有播放控制均委托给 PlaybackService
 class AudioPlayerHandler extends audio_service.BaseAudioHandler {
-  final PlayerController _player = PlayerController();
-  final PlaybackStateManager _state = PlaybackStateManager();
+  final PlaybackService _playback = PlaybackService();
 
+  // 当前媒体信息
   String? _currentId;
   String? _currentTitle;
   String? _currentArtist;
-
   Duration _currentPosition = Duration.zero;
   DateTime _lastPublishTime = DateTime.now();
   static const Duration _publishInterval = Duration(milliseconds: 500);
-
-  // ⭐ 缓存 artwork 文件路径，避免重复写入
   String? _currentArtworkPath;
+  bool _isPublishing = false;
 
   AudioPlayerHandler() {
-    _player.playingStream.listen((playing) {
-      _state.updatePlaying(playing);
-      _publishState();
+    _bindToPlayer();
+  }
+
+  // ═══════════════════════════════════════════════════════════════
+  // 绑定播放器状态流
+  // ═══════════════════════════════════════════════════════════════
+  void _bindToPlayer() {
+    final player = _playback.player;
+
+    player.stream.playing.listen((playing) {
+      _publishPlaybackState(
+        playing: playing,
+        position: _currentPosition,
+        duration: player.state.duration,
+      );
     });
 
-    _player.positionStream.listen((position) {
+    player.stream.position.listen((position) {
       _currentPosition = position;
-      _state.updatePosition(position);
-
       final now = DateTime.now();
       if (now.difference(_lastPublishTime) >= _publishInterval) {
         _lastPublishTime = now;
-        // ⭐ 只保留 _publishStateOnly()
-        _publishStateOnly();
+        _publishPlaybackState(
+          playing: player.state.playing,
+          position: position,
+          duration: player.state.duration,
+          onlyPosition: true,
+        );
       }
     });
 
-    _player.durationStream.listen((duration) {
-      debugPrint('🎯 [durationStream] duration=$duration');
-      _state.updateDuration(duration);
+    player.stream.duration.listen((duration) {
       if (_currentId != null && _currentTitle != null) {
         _updateMediaItem(
           id: _currentId!,
@@ -55,45 +68,97 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
           duration: duration,
         );
       }
-      _publishState();
+      _publishPlaybackState(
+        playing: player.state.playing,
+        position: _currentPosition,
+        duration: duration,
+      );
     });
   }
 
-  // ---- 发布状态 ----
-  void _publishState() {
-    final state = _state.playbackState;
-    playbackState.add(audio_service.PlaybackState(
-      controls: state.controls,
-      processingState: state.processingState,
-      playing: state.playing,
-      androidCompactActionIndices: state.androidCompactActionIndices,
-      updatePosition: _currentPosition,
-      updateTime: DateTime.now(),
-      systemActions: const {
-        audio_service.MediaAction.seek,
-      },
-    ));
+  // ═══════════════════════════════════════════════════════════════
+  // 外部同步接口（由 AudioService 调用）
+  // ═══════════════════════════════════════════════════════════════
+  void syncState(Song? song) {
+    if (song == null) {
+      _currentId = null;
+      _currentTitle = null;
+      _currentArtist = null;
+      return;
     }
 
-  void _publishStateOnly() {
-    final current = playbackState.value;
+    _updateMediaItem(
+      id: song.id,
+      title: song.title,
+      artist: song.artist,
+      artwork: song.artwork,
+    );
 
-    playbackState.add(audio_service.PlaybackState(
-      controls: current.controls.isNotEmpty
-          ? current.controls
-          : _state.playbackState.controls,
-      processingState: _state.playbackState.processingState,
-      playing: current.playing,
-      androidCompactActionIndices: current.androidCompactActionIndices,
-      updatePosition: _currentPosition,
-      updateTime: DateTime.now(),
-      systemActions: const {
-        audio_service.MediaAction.seek,
-      },
-    ));
+    final player = _playback.player;
+    _publishPlaybackState(
+      playing: player.state.playing,
+      position: _currentPosition,
+      duration: player.state.duration,
+    );
   }
 
-  // ---- 更新媒体信息 ----
+  // ═══════════════════════════════════════════════════════════════
+  // 状态发布
+  // ═══════════════════════════════════════════════════════════════
+  void _publishPlaybackState({
+    required bool playing,
+    required Duration position,
+    required Duration duration,
+    bool onlyPosition = false,
+  }) {
+    if (_isPublishing) return;
+    _isPublishing = true;
+
+    try {
+      final controls = _buildControls(playing);
+      // audio_service 侧映射：idle -> STATE_NONE，ready -> PLAYING/PAUSED。
+      // 之前只按 duration>0 判断，直播流/时长未解析出来时会被系统判定为"未在播放"
+      // （播放设备选择页、部分车机与耳机都会读到这个状态）。
+      final prepared = playing || duration.inMilliseconds > 0;
+      final state = audio_service.PlaybackState(
+        controls: controls,
+        processingState: prepared
+            ? audio_service.AudioProcessingState.ready
+            : audio_service.AudioProcessingState.idle,
+        playing: playing,
+        updatePosition: position,
+        updateTime: DateTime.now(),
+        systemActions: const {audio_service.MediaAction.seek},
+      );
+      playbackState.add(state);
+    } finally {
+      _isPublishing = false;
+    }
+  }
+
+  List<audio_service.MediaControl> _buildControls(bool playing) {
+    return [
+      const audio_service.MediaControl(
+        androidIcon: 'drawable/ic_previous',
+        label: '上一曲',
+        action: audio_service.MediaAction.skipToPrevious,
+      ),
+      audio_service.MediaControl(
+        androidIcon: playing ? 'drawable/ic_pause' : 'drawable/ic_play',
+        label: playing ? '暂停' : '播放',
+        action: audio_service.MediaAction.playPause,
+      ),
+      const audio_service.MediaControl(
+        androidIcon: 'drawable/ic_next',
+        label: '下一曲',
+        action: audio_service.MediaAction.skipToNext,
+      ),
+    ];
+  }
+
+  // ═══════════════════════════════════════════════════════════════
+  // 媒体信息更新
+  // ═══════════════════════════════════════════════════════════════
   void _updateMediaItem({
     required String id,
     required String title,
@@ -101,21 +166,15 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
     Duration? duration,
     Uint8List? artwork,
   }) {
-    debugPrint(
-        '📢 [handler] _updateMediaItem: artwork is ${artwork != null ? 'not null (${artwork.length} bytes)' : 'null'}');
     _currentId = id;
     _currentTitle = title;
     _currentArtist = artist;
-    final position = _player.position;
 
-    debugPrint('📢 [handler] updateMediaItem: $title - $artist');
+    final position = _playback.player.state.position;
 
-    // ⭐ 异步处理 artwork（不阻塞主流程）
     _handleArtwork(id, artwork).then((artUri) {
-      // 如果 artUri 变化，重新推送 MediaItem
       final current = mediaItem.value;
       if (current != null && current.artUri != artUri) {
-        debugPrint('📢 [handler] updating artUri: $artUri');
         mediaItem.add(audio_service.MediaItem(
           id: current.id,
           title: current.title,
@@ -127,38 +186,28 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
       }
     });
 
-    // 先推送不带封面图的 MediaItem（让 UI 尽快显示）
     mediaItem.add(audio_service.MediaItem(
       id: id,
       title: title,
       artist: artist,
-      duration: duration ?? _player.duration,
+      duration: duration ?? _playback.player.state.duration,
       extras: {'position': position.inMilliseconds},
     ));
   }
 
-  /// 处理封面图：保存到本地并生成 content URI
   Future<Uri?> _handleArtwork(String id, Uint8List? artwork) async {
-    if (artwork == null || artwork.isEmpty) {
-      _currentArtworkPath = null;
-      return null;
-    }
-
+    if (artwork == null || artwork.isEmpty) return null;
     try {
       final dir = await getApplicationDocumentsDirectory();
       final artworkDir = Directory('${dir.path}/artworks');
       if (!await artworkDir.exists()) {
         await artworkDir.create(recursive: true);
       }
-
-      // 使用 md5 生成安全的文件名
       final bytes = utf8.encode(id);
       final digest = md5.convert(bytes);
       final fileName = '$digest.jpg';
       final path = '${artworkDir.path}/$fileName';
       final file = File(path);
-
-      // 检查文件是否已存在
       if (await file.exists()) {
         final existingBytes = await file.readAsBytes();
         if (existingBytes.length == artwork.length &&
@@ -167,12 +216,8 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
           return await FileProviderUtils.getContentUri(file);
         }
       }
-
-      // 写入新文件
       await file.writeAsBytes(artwork);
       _currentArtworkPath = path;
-      debugPrint('📢 [handler] artwork saved: $path');
-
       return await FileProviderUtils.getContentUri(file);
     } catch (e) {
       debugPrint('⚠️ [handler] artwork handling failed: $e');
@@ -180,50 +225,55 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
     }
   }
 
-  // ---- 外部接口 ----
   void updateNotification({
     required String id,
     required String title,
     required String artist,
     Uint8List? artwork,
   }) {
-    _updateMediaItem(
-      id: id,
-      title: title,
-      artist: artist,
-      artwork: artwork,
+    _updateMediaItem(id: id, title: title, artist: artist, artwork: artwork);
+    final player = _playback.player;
+    _publishPlaybackState(
+      playing: player.state.playing,
+      position: _currentPosition,
+      duration: player.state.duration,
     );
-    _publishState();
   }
 
-  // ---- 控制命令 ----
+  // ═══════════════════════════════════════════════════════════════
+  // audio_service 控制命令（全部委托给 PlaybackService）
+  // ═══════════════════════════════════════════════════════════════
   @override
   Future<void> play() async {
     debugPrint('▶️ [handler] play() called');
-    _player.play();
-    _publishState();
+    // 走 AudioService 的统一入口：冷启动首次播放需要先 open + seek
+    await AudioService().playOrResume();
   }
 
   @override
   Future<void> pause() async {
     debugPrint('⏸️ [handler] pause() called');
-    _player.pause();
-    _publishState();
+    await _playback.pause();
   }
 
   @override
   Future<void> stop() async {
     debugPrint('⏹️ [handler] stop() called');
-    _player.stop();
-    _publishState();
+    await _playback.stop();
   }
 
   @override
   Future<void> seek(Duration position) async {
     debugPrint('⏩ [handler] seek() called: $position');
-    await _player.seek(position);
+    await _playback.seek(position);
     _currentPosition = position;
-    _publishStateOnly();
+    final player = _playback.player;
+    _publishPlaybackState(
+      playing: player.state.playing,
+      position: position,
+      duration: player.state.duration,
+      onlyPosition: true,
+    );
   }
 
   @override
@@ -251,14 +301,14 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
         await skipToPrevious();
         break;
       case audio_service.MediaButton.media:
-        if (_player.isPlaying) {
+        if (_playback.player.state.playing) {
           await pause();
         } else {
           await play();
         }
         break;
       default:
-        if (_player.isPlaying) {
+        if (_playback.player.state.playing) {
           await pause();
         } else {
           await play();

lib/services/audio_service.dart

@@ -7,12 +7,16 @@ import 'package:flutter/material.dart';
 import 'package:media_kit/media_kit.dart' as media_kit;
 import 'package:path_provider/path_provider.dart';
 import 'playback_service.dart';
+import 'network_watcher.dart';
+import 'prefetch_service.dart';
 import '../metadata/metadata_service.dart';
 import '../database/song_database.dart';
 import '../utils/artwork_helper.dart';
+import '../utils/song_key.dart';
 import '../repositories/playlist_repository.dart';
 import '../models/playlist.dart';
 import 'webdav_service.dart';
+import 'audio_player_handler.dart';
 
 enum PlayMode {
   sequential,
@@ -62,6 +66,9 @@ class AudioService extends ChangeNotifier {
   // ---- 当前播放的歌单 ID ----
   String? _currentPlaylistId;
 
+  // ⭐ 插入位置：在现有成员变量之后，方法之前
+  AudioPlayerHandler? _handler; // ⭐ 添加这一行
+
   // ---- 高频进度 ----
   final ValueNotifier<Duration> positionNotifier = ValueNotifier(Duration.zero);
   final ValueNotifier<Duration> durationNotifier = ValueNotifier(Duration.zero);
@@ -76,6 +83,51 @@ class AudioService extends ChangeNotifier {
   bool _hasStartedCurrentPlayback = false;
   bool _isUserSeeking = false;
 
+  /// 切歌请求序号：只有最新一次请求有权解锁、写状态。
+  int _switchEpoch = 0;
+
+  /// 卡死判定阈值 / 节流
+  static const Duration _stallThreshold = Duration(seconds: 20);
+  static const Duration _startStallThreshold = Duration(seconds: 10);
+  DateTime? _lastStallRecoveryAt;
+
+  /// 最近一次进入 buffering 的时间（用于卡死判定，不能用计时器重置）
+  DateTime? _lastBufferingAt;
+
+  /// 网络切换去抖
+  Timer? _networkDebounce;
+
+  /// 进度看门狗：某些卡死不会触发 buffering 事件（例如 CDN 半开连接），
+  /// 用「播放中进度长时间不动」兜底。
+  Timer? _progressTimer;
+  Duration _lastObservedPosition = Duration.zero;
+  DateTime _lastProgressAt = DateTime.now();
+
+  /// 当前歌曲开始加载的时间，用于"起播看门狗"：
+  /// 有些情况下 mpv 的 playing 已经是 true，但 position 永远是 0、
+  /// 也不发 buffering / error（实测公网链路可静默卡 75s+）。
+  DateTime? _trackStartAt;
+  DateTime? _playReadyAt;
+  int _prefetchedGeneration = -1;
+
+  /// 元数据回退到文件名时置位，播到 80% 再试一次
+  bool _metadataNeedsRetry = false;
+  int _metadataRetryGeneration = -1;
+  bool _firstAudioReported = false;
+
+  /// 冷启动恢复后尚未真正打开媒体：首次点击播放走 _playCurrent（含 seek）
+  bool _restoredPendingOpen = false;
+
+  /// 播放中定时持久化位置（冷启动能回到准确位置）
+  DateTime _lastPositionSaveAt = DateTime.now();
+
+  /// 打开失败后的快速重试（每首歌最多一次）
+  int _openRetryGeneration = -1;
+
+  /// 最近一次播放失败的原因，供 UI 提示；成功播放后自动清空。
+  String? _lastPlaybackError;
+  String? get lastPlaybackError => _lastPlaybackError;
+
   int _playbackGeneration = 0;
 
   // ---- 待恢复的播放进度 ----
@@ -115,6 +167,11 @@ class AudioService extends ChangeNotifier {
     _onSongChanged = callback;
   }
 
+  void setHandler(AudioPlayerHandler handler) {
+    // ⭐ 添加这个方法
+    _handler = handler;
+  }
+
   void togglePlayMode() {
     switch (_playMode) {
       case PlayMode.sequential:
@@ -243,16 +300,15 @@ class AudioService extends ChangeNotifier {
   // ════════════════════════════════════════════════════════════
 
   Future<void> _playCurrent() async {
-    if (_isChangingTrack) {
-      debugPrint('⚠️ [AudioService] track switch already running');
-      return;
-    }
-
     if (_currentIndex < 0 || _currentIndex >= _queue.length) {
       stopPlay();
       return;
     }
 
+    // 「最新请求胜出」：不再因为 _isChangingTrack 为 true 就直接丢弃请求。
+    // 旧请求会通过 epoch 校验自行放弃后续步骤，避免和新的切歌互相覆盖。
+    final epoch = ++_switchEpoch;
+    _restoredPendingOpen = false;
     _isChangingTrack = true;
     _handlingCompletion = false;
     _hasStartedCurrentPlayback = false;
@@ -264,6 +320,8 @@ class AudioService extends ChangeNotifier {
       final song = _queue[_currentIndex];
       _currentSong = song;
 
+      _handler?.syncState(song);
+
       _startListening();
       notifyListeners();
 
@@ -271,9 +329,34 @@ class AudioService extends ChangeNotifier {
         return;
       }
 
+      try {
+        _trackStartAt = DateTime.now();
+        _playReadyAt = null;
+        _firstAudioReported = false;
+        _metadataNeedsRetry = false;
         await _playWithHeaders(song.url!);
+        _playReadyAt = DateTime.now();
+      } catch (e) {
+        // 播放失败（超时/401/网络中断）：必须走到 finally 解锁，
+        // 并把错误记下来，供上层提示或下一首重试。
+        _lastPlaybackError = '播放失败: $e';
+        debugPrint('❌ [AudioService] play failed: $e');
+        notifyListeners();
+        return;
+      }
+
+      if (epoch != _switchEpoch) {
+        debugPrint('↩️ [AudioService] 旧请求已被新的切歌取代，停止后续处理');
+        return;
+      }
+
       await _waitForPlaybackStarted();
 
+      if (epoch != _switchEpoch) {
+        debugPrint('↩️ [AudioService] 旧请求已被新的切歌取代，停止后续处理');
+        return;
+      }
+
       // ⭐ 如果有待恢复的进度，执行 seek
       if (_pendingSeekPosition != null &&
           _pendingSeekPosition!.inMilliseconds > 0) {
@@ -287,16 +370,253 @@ class AudioService extends ChangeNotifier {
       _syncPlayerStateDelayed();
 
       if (_hasStartedCurrentPlayback) {
+        _lastPlaybackError = null;
         _onSongChanged?.call(song);
-        _loadMetadataForCurrentSong(generation);
+        // 不在起播瞬间抓元数据：此时 mpv 正在填缓冲区，
+        // 2MB 的标签请求会和播放流抢带宽，实测会把"下一首"拖到 60s+。
+        _scheduleMetadataWhenSettled(generation, epoch);
       }
 
       // 切歌完成后保存状态
       await savePlaybackState();
     } finally {
+      // 只有最新的一次切歌才有资格解锁，防止旧请求把新请求的锁提前放掉
+      if (epoch == _switchEpoch) {
         _isChangingTrack = false;
       }
     }
+  }
+
+  /// 等播放真正稳定后再抓元数据。
+  ///
+  /// 判定条件比"能出声"更严格：进度至少 5s、且连续 2s 不处于 buffering。
+  /// 原因：公网链路上新歌起播后 mpv 还在持续填缓冲，
+  /// 这时候插一个 2MB 的标签下载会直接把缓冲打回 0（实测下一首要等 60s+）。
+  /// 最多等 30s；等不到就放弃这次抓取（下次播放会再试）。
+  Future<bool> _waitForPlaybackSettled(int epoch,
+      {Duration timeout = const Duration(seconds: 30)}) async {
+    final player = PlaybackService().player;
+    final deadline = DateTime.now().add(timeout);
+    var quietChecks = 0;
+
+    while (DateTime.now().isBefore(deadline)) {
+      if (epoch != _switchEpoch) return false;
+
+      final ready = player.state.playing &&
+          !player.state.buffering &&
+          player.state.position >= const Duration(seconds: 5);
+
+      if (ready) {
+        quietChecks++;
+        // 每 500ms 采一次，连续 4 次即稳定 2 秒
+        if (quietChecks >= 4) return true;
+      } else {
+        quietChecks = 0;
+      }
+
+      await Future.delayed(const Duration(milliseconds: 500));
+    }
+    return false;
+  }
+
+  void _scheduleMetadataWhenSettled(int generation, int epoch) {
+    // 故意不 await：不能阻塞切歌流程和状态保存
+    () async {
+      try {
+        final settled = await _waitForPlaybackSettled(epoch);
+        if (!settled || epoch != _switchEpoch) {
+          debugPrint('⏸️ [AudioService] 播放未稳定，跳过本次元数据抓取（避免抢带宽）');
+          _metadataNeedsRetry = true; // 留到 80% 再试
+          return;
+        }
+        await _loadMetadataForCurrentSong(generation);
+      } catch (e) {
+        debugPrint('⚠️ [AudioService] 延迟元数据抓取失败: $e');
+      }
+    }();
+  }
+
+  /// 播到 80% 时，对"元数据回退到文件名"的歌再抓一次。
+  ///
+  /// 原因：反代在等上游首包超时时会直接回 502（实测 10.3s），
+  /// 起播阶段抓取很容易撞上；到 80% 时链路通常已经热了，重试成功率更高。
+  /// 每首歌最多重试一次。
+  void _maybeRetryMetadata(Duration position) {
+    if (!_metadataNeedsRetry) return;
+
+    final duration = durationNotifier.value;
+    if (duration.inMilliseconds <= 0) return;
+    if (position.inMilliseconds < duration.inMilliseconds * 0.8) return;
+    if (_metadataRetryGeneration == _playbackGeneration) return;
+
+    _metadataRetryGeneration = _playbackGeneration;
+    _metadataNeedsRetry = false;
+    debugPrint('🔁 [AudioService] 播放到 80%，重试一次元数据抓取');
+    _loadMetadataForCurrentSong(_playbackGeneration);
+  }
+
+  /// 播到 60% 时预热下一首（HEAD + Range 0-0，不下载正文）。
+  ///
+  /// 日志实测起播延迟 2~3s 都在"等首批数据"，提前完成 DNS/TLS/反代握手
+  /// 可以把这段时间压掉一部分；失败完全静默，不影响当前播放。
+  void _maybePrefetchNext(Duration position) {
+    final duration = durationNotifier.value;
+    if (duration.inSeconds < 60) return;
+    if (position.inMilliseconds < duration.inMilliseconds * 0.6) return;
+    if (_prefetchedGeneration == _playbackGeneration) return;
+
+    final next = _peekNextSong();
+    final url = next?.url;
+    if (url == null || url.isEmpty) return;
+
+    _prefetchedGeneration = _playbackGeneration;
+    debugPrint('🔥 [AudioService] 预热下一首：${next!.title}');
+    PrefetchService().warm(url);
+  }
+
+  /// 只推算下一首，不改变队列/索引（next() 会改）。
+  Song? _peekNextSong() {
+    if (_queue.isEmpty) return null;
+
+    if (_playMode == PlayMode.shuffle) {
+      if (_shuffledIndices.isEmpty) return null;
+      final nextIdx = (_shuffledIndex + 1) % _shuffledIndices.length;
+      return _queue[_shuffledIndices[nextIdx]];
+    }
+
+    final nextIdx = (_currentIndex + 1) % _queue.length;
+    return _queue[nextIdx];
+  }
+
+  /// 进度看门狗：播放中进度 30s 不动、且近期出现过缓冲，判定为卡死。
+  ///
+  /// 为什么不能只看 `buffering`：弱网下它会在 true/false 之间反复抖动，
+  /// 每次 true 若都重置计时器，阈值永远不会到（实测公网链路抖动 60s+ 不恢复）。
+  /// 为什么不能只看进度：用户暂停时进度也不动，会误触发。
+  /// 两个条件同时满足即可区分。
+  void _checkPlaybackProgress() {
+    if (_isChangingTrack) {
+      // 切歌中不参与判断，重置基准
+      _lastObservedPosition = positionNotifier.value;
+      _lastProgressAt = DateTime.now();
+      return;
+    }
+
+    final now = DateTime.now();
+    final pos = positionNotifier.value;
+    if (pos != _lastObservedPosition) {
+      _lastObservedPosition = pos;
+      _lastProgressAt = now;
+      // 每 10s 持久化一次进度：进程被系统回收后，冷启动能回到准确位置
+      if (now.difference(_lastPositionSaveAt) >= const Duration(seconds: 10)) {
+        _lastPositionSaveAt = now;
+        savePlaybackState();
+      }
+      return;
+    }
+
+    final player = PlaybackService().player;
+
+    // 起播看门狗：playing=true 但 position 一直是 0，且没有任何 buffering/error 事件。
+    // 这种情况 mpv 不会自己恢复，通用 20s 规则又太慢，单独用 10s 阈值。
+    final stuckAtStart = pos == Duration.zero &&
+        _trackStartAt != null &&
+        now.difference(_trackStartAt!) >= _startStallThreshold &&
+        player.state.playing;
+    if (stuckAtStart) {
+      debugPrint('🩺 [AudioService] 起播 '
+          '${_startStallThreshold.inSeconds}s 仍停在 0s，触发重连');
+      _trackStartAt = now; // 避免下一次 tick 立刻重复触发
+      _recoverFromStall(force: true);
+      return;
+    }
+
+    final stalledFor = now.difference(_lastProgressAt);
+    final recentlyBuffering = _lastBufferingAt != null &&
+        now.difference(_lastBufferingAt!) < const Duration(seconds: 20);
+
+    // playing==true 也是卡死的充分条件（暂停时 playing 为 false）
+    if (stalledFor >= _stallThreshold &&
+        (player.state.playing || recentlyBuffering)) {
+      debugPrint('🩺 [AudioService] 进度停在 $pos 已 ${stalledFor.inSeconds}s，'
+          '触发自愈');
+      _lastProgressAt = now;
+      _recoverFromStall(force: true);
+    }
+  }
+
+  /// 打开失败（ffurl_read / Failed to open）后 1.5s 立即重试一次。
+  ///
+  /// 实测：切歌后 mpv 在 5~6s 时放弃打开，旧逻辑要等起播看门狗
+  /// （5s 一跳 × 10s 阈值，最坏 20s）才重连，表现为十几秒的前摇。
+  /// 每首歌最多快速重试一次，避免失败风暴。
+  void _scheduleOpenRetry() {
+    if (_currentSong == null) return;
+    if (_isChangingTrack) return;
+    if (_openRetryGeneration == _playbackGeneration) return;
+
+    _openRetryGeneration = _playbackGeneration;
+    debugPrint('🔁 [AudioService] 打开失败，1.5s 后自动重试');
+    Timer(const Duration(milliseconds: 1500), () {
+      if (_currentSong == null) return;
+      if (_isChangingTrack) return;
+      _recoverFromStall(force: true);
+    });
+  }
+
+  /// 卡死/网络切换自愈：重开当前歌曲并 seek 回原位置。
+  ///
+  /// [force] 为 true 时跳过节流（用于网络切换这种明确的外部事件）。
+  Future<void> _recoverFromStall({bool force = false}) async {
+    if (_isChangingTrack) return;
+
+    final song = _currentSong;
+    if (song == null) return;
+    final url = song.url;
+    if (url == null || url.isEmpty) return;
+
+    final now = DateTime.now();
+    if (!force &&
+        _lastStallRecoveryAt != null &&
+        now.difference(_lastStallRecoveryAt!) < const Duration(minutes: 2)) {
+      debugPrint('🩺 [AudioService] 仍在缓冲，但 2 分钟内已恢复过，交给用户手动切歌');
+      return;
+    }
+    _lastStallRecoveryAt = now;
+
+    final resumeAt = positionNotifier.value;
+    debugPrint('🩺 [AudioService] 尝试重连：${song.title}（从 ${resumeAt.inSeconds}s 继续）');
+    try {
+      _trackStartAt = DateTime.now();
+      _playReadyAt = null;
+      _firstAudioReported = false;
+      await _playWithHeaders(url);
+      _playReadyAt = DateTime.now();
+      if (resumeAt > Duration.zero) {
+        await PlaybackService().seek(resumeAt);
+        positionNotifier.value = resumeAt;
+      }
+      debugPrint('✅ [AudioService] 自动恢复完成');
+    } catch (e) {
+      debugPrint('❌ [AudioService] 自动恢复失败: $e');
+      _lastPlaybackError = '缓冲卡住，自动恢复失败';
+      notifyListeners();
+    }
+  }
+
+  /// 网络切换（Wi-Fi 换 AP、Wi-Fi <-> 移动数据）后的主动重连。
+  ///
+  /// 长连接会随出口 IP 变化失效，mpv 不保证会自己重连。
+  /// 这里做 3s 去抖：切换瞬间往往会连续触发多次网络接口变化。
+  void _onNetworkChanged() {
+    _networkDebounce?.cancel();
+    _networkDebounce = Timer(const Duration(seconds: 2), () {
+      if (_currentSong == null) return;
+      if (_isChangingTrack) return;
+      debugPrint('🌐 [AudioService] 网络已切换，主动重连当前歌曲');
+      _recoverFromStall(force: true);
+    });
+  }
 
   Future<void> _waitForPlaybackStarted() async {
     final player = PlaybackService().player;
@@ -340,9 +660,8 @@ class AudioService extends ChangeNotifier {
     return {};
   }
 
-  String _generateSongKey(String url, int fileSize, int modifiedTime) {
-    final raw = '$url|$fileSize|$modifiedTime';
-    return raw.hashCode.toString();
+  String _generateSongKey(String url) {
+    return songKeyFor(url);
   }
 
   // ════════════════════════════════════════════════════════════
@@ -394,6 +713,15 @@ class AudioService extends ChangeNotifier {
       }
 
       if (metadata.isNotEmpty) {
+        // 来源是文件名 = 元数据没读到（常见于反代 502 / 超时）
+        // 记下来，播到 80% 时再试一次，避免这首歌永远只有文件名
+        if (metadata.source == 'filename') {
+          _metadataNeedsRetry = true;
+          debugPrint('⚠️ [AudioService] 元数据回退到文件名，将在 80% 处重试一次');
+        } else {
+          _metadataNeedsRetry = false;
+        }
+
         final updatedSong = Song(
           id: song.id,
           title: metadata.title.isNotEmpty ? metadata.title : song.title,
@@ -431,13 +759,12 @@ class AudioService extends ChangeNotifier {
       final file = await provider.getFile(url);
       if (file != null && await file.exists()) {
         final stat = await file.stat();
-        songKey = _generateSongKey(
-            url, stat.size, stat.modified.millisecondsSinceEpoch);
+        songKey = _generateSongKey(url);
       } else {
-        songKey = url.hashCode.toString();
+        songKey = songKeyForUrl(url);
       }
     } catch (e) {
-      songKey = url.hashCode.toString();
+      songKey = songKeyForUrl(url);
     }
 
     final db = SongDatabase();
@@ -450,7 +777,7 @@ class AudioService extends ChangeNotifier {
 
     try {
       final cacheDir = await getTemporaryDirectory();
-      final cachePath = '${cacheDir.path}/metadata_${url.hashCode}.tmp';
+      final cachePath = '${cacheDir.path}/metadata_${songKeyForUrl(url)}.tmp';
       final cacheFile = File(cachePath);
       if (await cacheFile.exists()) {
         await cacheFile.delete();
@@ -483,11 +810,7 @@ class AudioService extends ChangeNotifier {
       return;
     }
 
-    if (_isChangingTrack) {
-      debugPrint('⚠️ [next] REJECTED: track switch in progress');
-      return;
-    }
-
+    // 不再因为 _isChangingTrack 拒绝：新请求会取代进行中的切歌（latest wins）
     if (_playMode == PlayMode.shuffle) {
       if (_shuffledIndices.isEmpty) return;
       final nextIdx = (_shuffledIndex + 1) % _shuffledIndices.length;
@@ -505,12 +828,7 @@ class AudioService extends ChangeNotifier {
   Future<void> previous() async {
     if (_queue.isEmpty) return;
 
-    if (_isChangingTrack) {
-      debugPrint(
-          '⚠️ [AudioService] previous() ignored: track switch in progress');
-      return;
-    }
-
+    // 同 next()：最新请求胜出，不拒绝
     if (_playMode == PlayMode.shuffle) {
       if (_shuffledIndices.isEmpty) return;
       final prevIdx = (_shuffledIndex - 1) % _shuffledIndices.length;
@@ -539,14 +857,35 @@ class AudioService extends ChangeNotifier {
 
     if (_isPlaying) {
       PlaybackService().pause();
-    } else {
-      PlaybackService().resume();
+      savePlaybackState();
+      return;
     }
-    // 保存状态（包括进度）
+
+    playOrResume();
+  }
+
+  /// 统一的"继续播放"入口：UI 按钮、通知栏、耳机键都走这里。
+  ///
+  /// 冷启动恢复后音频尚未加载，此时 resume() 是在空播放器上调用，
+  /// 表现就是"点了没反应"。这种情况改走 _playCurrent（open + seek + play）。
+  Future<void> playOrResume() async {
+    if (_currentSong == null) return;
+    if (_isPlaying) return;
+
+    if (_restoredPendingOpen) {
+      _restoredPendingOpen = false;
+      debugPrint('▶️ [AudioService] 冷启动后首次播放，按保存进度打开');
+      await _playCurrent();
+      return;
+    }
+
+    await PlaybackService().resume();
     savePlaybackState();
   }
 
   void stopPlay() {
+    // 停止底层播放器
+    PlaybackService().stop(); // 新增
     _currentSong = null;
     _isPlaying = false;
     positionNotifier.value = Duration.zero;
@@ -554,7 +893,6 @@ class AudioService extends ChangeNotifier {
     bufferedNotifier.value = Duration.zero;
     _stopListening();
     notifyListeners();
-    // 停止时也保存一次
     savePlaybackState();
   }
 
@@ -634,6 +972,19 @@ class AudioService extends ChangeNotifier {
           debugPrint('🎯 [AudioService] positionStream ignored: user seeking');
           return;
         }
+        // 首次拿到 >0 的播放位置：这是"真正出声"的时刻，
+        // 与 play() 发起时间相减即可算出起播延迟。
+        if (!_firstAudioReported && position > Duration.zero) {
+          _firstAudioReported = true;
+          final readyAt = _playReadyAt;
+          if (readyAt != null) {
+            final ms = DateTime.now().difference(readyAt).inMilliseconds;
+            debugPrint('🔊 [AudioService] 起播耗时 ${ms}ms（open 完成 -> 出声）');
+            _playReadyAt = null;
+          }
+        }
+        _maybeRetryMetadata(position);
+        _maybePrefetchNext(position);
         positionNotifier.value = position;
       }),
     );
@@ -653,6 +1004,47 @@ class AudioService extends ChangeNotifier {
       }),
     );
 
+    // mpv 的错误（401 / 连接失败 / 解码失败）以前没有任何订阅，失败是静默的
+    _subscriptions.add(
+      player.stream.error.listen((error) {
+        debugPrint('❌ [AudioService] player error: $error');
+        _lastPlaybackError = error;
+        notifyListeners();
+        // 打开失败（ffurl_read / Failed to open）时立刻安排一次重试，
+        // 不要等 10~20s 的起播看门狗。
+        if (error.contains('Failed to open') ||
+            error.contains('ffurl_read')) {
+          _scheduleOpenRetry();
+        }
+      }),
+    );
+
+    // 缓冲状态：只记录"最近一次进入缓冲的时间"。
+    // 不能用 Timeout 重置计时：弱网下 buffering 会 true/false 反复抖动，
+    // 每次 true 都重置的话，30s 阈值永远不会到。
+    _subscriptions.add(
+      player.stream.buffering.listen((buffering) {
+        debugPrint('🌊 [AudioService] buffering=$buffering');
+        if (buffering) {
+          _lastBufferingAt = DateTime.now();
+        }
+      }),
+    );
+
+    // 进度看门狗：播放中进度 30s 不动、且近期发生过缓冲 → 判定卡死并自愈。
+    // 用"进度 + 最近缓冲"两个条件，既不会在暂停时误触发，
+    // 也能覆盖 buffering 反复抖动、始终起不来的情况。
+    _progressTimer?.cancel();
+    _lastProgressAt = DateTime.now();
+    _progressTimer = Timer.periodic(
+      const Duration(seconds: 5),
+      (_) => _checkPlaybackProgress(),
+    );
+
+    // 网络变化监听：换 Wi-Fi / 切移动数据后长连接会失效，主动重连
+    NetworkWatcher().onChanged = _onNetworkChanged;
+    NetworkWatcher().start();
+
     // ⭐ 完整生命周期校验的 completed 监听
     _subscriptions.add(
       player.stream.completed.listen((_) {
@@ -821,11 +1213,18 @@ class AudioService extends ChangeNotifier {
       _currentSong = song;
       _onSongChanged?.call(song);
 
+      _handler?.syncState(song); // ⭐ 添加这一行
+
       debugPrint(
           '♻️ [AudioService] playback state restored: ${song.title} - ${song.artist}');
 
-      // ⭐ 关键：加载音频但不自动播放
-      await _loadRestoredPlayback();
+      // 冷启动只恢复 UI 状态，不联网预加载。
+      // 进程被系统回收后再回来时，预加载（play→seek→pause）会拖慢首屏，
+      // 还会和用户点播放的操作打架，表现为"假死十几秒"。
+      _restoredPendingOpen = true;
+      _isPlaying = false;
+      positionNotifier.value = _pendingSeekPosition ?? Duration.zero;
+      notifyListeners();
 
       return true;
     } catch (e) {
@@ -834,44 +1233,17 @@ class AudioService extends ChangeNotifier {
     }
   }
 
-  /// ⭐ 加载恢复的播放状态（加载音频，不自动播放）
-  Future<void> _loadRestoredPlayback() async {
-    if (_queue.isEmpty || _currentIndex < 0) return;
-    final song = _queue[_currentIndex];
-    if (song.url == null || song.url!.isEmpty) return;
-
-    // 启动监听
-    _startListening();
-
-    // 加载音频（带 headers）
-    final headers = await _getAuthHeadersForUrl(song.url!);
-    await PlaybackService().play(song.url!, headers: headers);
-
-    // 等待播放器准备好
-    await _waitForPlaybackStarted();
-
-    // 如果有待恢复的进度，执行 seek
-    if (_pendingSeekPosition != null &&
-        _pendingSeekPosition!.inMilliseconds > 0) {
-      final pos = _pendingSeekPosition!;
-      _pendingSeekPosition = null;
-      await PlaybackService().seek(pos);
-      positionNotifier.value = pos;
-      debugPrint('🎯 [AudioService] restored position: $pos');
-    }
-
-    // ⭐ 加载完成后立即暂停（用户点击播放按钮后才继续）
-    await PlaybackService().pause();
-    _isPlaying = false;
-    _hasStartedCurrentPlayback = true;
-    notifyListeners();
-
-    debugPrint('🎵 [AudioService] restored playback loaded and paused');
-  }
+  // 说明：冷启动不再预加载音频（原 _loadRestoredPlayback）。
+  // 恢复只做 UI 状态，首次播放时由 togglePlay → _playCurrent 完成 open + seek。
 
   @override
   void dispose() {
     // 先保存再清理
+    _progressTimer?.cancel();
+    _progressTimer = null;
+    _networkDebounce?.cancel();
+    _networkDebounce = null;
+    NetworkWatcher().stop();
     savePlaybackState();
     _stopListening();
     positionNotifier.dispose();

lib/services/network_watcher.dart

@@ -0,0 +1,68 @@
+// lib/services/network_watcher.dart
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+
+/// 监听本机网络接口的地址变化。
+///
+/// 为什么不直接依赖 mpv 自己恢复：HTTP 流是长连接，Wi-Fi 切换 / 移动数据切换
+/// 会换掉出口 IP，旧连接直接失效。mpv 不一定会重连，通常表现为
+/// "进度不动、缓冲一直转"。所以在网络变化时由上层主动重开当前歌曲。
+///
+/// 实现方式：每 10s 枚举一次 IPv4 地址，签名变化即视为网络切换。
+/// 相比平台 Channel 的方案，它不需要新增权限或插件，
+/// 且能覆盖"同一个 Wi-Fi 换了 AP / 换了出口"这类 transport 类型不变的情况。
+class NetworkWatcher {
+  static final NetworkWatcher _instance = NetworkWatcher._internal();
+  factory NetworkWatcher() => _instance;
+  NetworkWatcher._internal();
+
+  Timer? _timer;
+  String? _lastSignature;
+  bool _ticking = false;
+
+  /// 网络签名变化时回调（已在内部做过去抖）
+  void Function()? onChanged;
+
+  void start({Duration interval = const Duration(seconds: 3)}) {
+    if (_timer != null) return;
+    _timer = Timer.periodic(interval, (_) => _tick());
+    _tick();
+    debugPrint('🌐 [NetworkWatcher] 已启动（每 ${interval.inSeconds}s 检查一次）');
+  }
+
+  void stop() {
+    _timer?.cancel();
+    _timer = null;
+    _lastSignature = null;
+    debugPrint('🌐 [NetworkWatcher] 已停止');
+  }
+
+  Future<void> _tick() async {
+    if (_ticking) return;
+    _ticking = true;
+    try {
+      final interfaces = await NetworkInterface.list(
+        type: InternetAddressType.IPv4,
+        includeLoopback: false,
+      );
+      final signature = interfaces
+          .map((i) => '${i.name}:${i.addresses.map((a) => a.address).join(',')}')
+          .join('|');
+
+      final previous = _lastSignature;
+      _lastSignature = signature;
+
+      // 首次只记录基线，不触发
+      if (previous != null && previous != signature) {
+        debugPrint('🌐 [NetworkWatcher] 检测到网络变化');
+        onChanged?.call();
+      }
+    } catch (e) {
+      debugPrint('⚠️ [NetworkWatcher] 枚举网络接口失败: $e');
+    } finally {
+      _ticking = false;
+    }
+  }
+}

lib/services/playback_service.dart

@@ -1,20 +1,32 @@
 // lib/services/playback_service.dart
+import 'dart:async';
+
 import 'package:media_kit/media_kit.dart';
+import 'package:flutter/foundation.dart';
 
-// ============================================================
-// PlaybackService - 播放引擎封装
-// 职责：管理 Player 生命周期，不涉及业务逻辑
-// ============================================================
 class PlaybackService {
   static final PlaybackService _instance = PlaybackService._internal();
   factory PlaybackService() => _instance;
-  PlaybackService._internal();
+  PlaybackService._internal() {
+    // ⭐ 给单例本身打上 ID
+    _serviceId = DateTime.now().microsecondsSinceEpoch.toString();
+    debugPrint('🎯 [PlaybackService] 单例创建, serviceId=$_serviceId');
+  }
+
+  /// 弱网/源站抖动时，mpv 的 open 可能长时间不返回。
+  /// 不设上限的话 _playCurrent() 的 finally 永远不执行，
+  /// _isChangingTrack 会永久为 true，整个切歌链路假死。
+  static const Duration _openTimeout = Duration(seconds: 20);
+  static const Duration _controlTimeout = Duration(seconds: 5);
 
   Player? _player;
   bool _initialized = false;
+  late final String _serviceId; // ⭐ 服务实例 ID
 
   // ---------- Getter ----------
   Player get player {
+    debugPrint(
+        '🎯 [PlaybackService] get player called, serviceId=$_serviceId, initialized=$_initialized, player=${_player?.hashCode}');
     if (!_initialized) init();
     return _player!;
   }
@@ -23,48 +35,91 @@ class PlaybackService {
 
   // ---------- 初始化 ----------
   void init() {
-    if (_initialized) return;
+    if (_initialized) {
+      debugPrint(
+          '⚠️ [PlaybackService] init() 被重复调用, 跳过, serviceId=$_serviceId, player=${_player?.hashCode}');
+      return;
+    }
     _player = Player();
     _initialized = true;
-
-    // 可以在这里配置初始参数
-    // _player.setVolume(1.0);
+    debugPrint(
+        '✅ [PlaybackService] Player 已创建, serviceId=$_serviceId, player=${_player.hashCode}');
   }
 
   // ---------- 播放 ----------
   Future<void> play(String url, {Map<String, String>? headers}) async {
+    debugPrint(
+        '▶️ [PlaybackService] play() called, serviceId=$_serviceId, player=${_player?.hashCode}, url=${_shortUrl(url)}');
     if (!_initialized) init();
 
     final media = (headers != null && headers.isNotEmpty)
         ? Media(url, httpHeaders: headers)
         : Media(url);
 
-    await _player!.open(media);
-    await _player!.play();
+    try {
+      final sw = Stopwatch()..start();
+      await _player!.open(media).timeout(_openTimeout);
+      final openMs = sw.elapsedMilliseconds;
+      await _player!.play().timeout(_controlTimeout);
+      debugPrint('⏱️ [PlaybackService] open 完成 ${openMs}ms，'
+          'play 完成 ${sw.elapsedMilliseconds}ms');
+    } on TimeoutException {
+      debugPrint(
+          '❌ [PlaybackService] open timeout (${_openTimeout.inSeconds}s): ${_shortUrl(url)}');
+      await _safeStop();
+      rethrow;
+    } catch (e) {
+      debugPrint('❌ [PlaybackService] play failed: $e');
+      await _safeStop();
+      rethrow;
+    }
+  }
+
+  /// 失败时尽量把播放器拉回可用的空闲状态，避免下一次 open 继续卡住。
+  Future<void> _safeStop() async {
+    try {
+      await _player?.stop().timeout(const Duration(seconds: 3));
+    } catch (_) {
+      // 忽略：stop 本身失败也不应影响上层解锁
+    }
+  }
+
+  /// 日志里不打完整 URL（WebDAV 路径很长，且可能带签名参数）
+  String _shortUrl(String url) {
+    final hash = url.hashCode.toRadixString(16);
+    return url.length <= 48 ? url : '${url.substring(0, 48)}…#$hash';
   }
 
   // ---------- 控制 ----------
   Future<void> pause() async {
+    debugPrint(
+        '⏸️ [PlaybackService] pause() called, serviceId=$_serviceId, player=${_player?.hashCode}');
     if (_initialized && _player != null) {
-      await _player!.pause();
+      await _player!.pause().timeout(_controlTimeout);
     }
   }
 
   Future<void> resume() async {
+    debugPrint(
+        '▶️ [PlaybackService] resume() called, serviceId=$_serviceId, player=${_player?.hashCode}');
     if (_initialized && _player != null) {
-      await _player!.play();
+      await _player!.play().timeout(_controlTimeout);
     }
   }
 
   Future<void> stop() async {
+    debugPrint(
+        '⏹️ [PlaybackService] stop() called, serviceId=$_serviceId, player=${_player?.hashCode}');
     if (_initialized && _player != null) {
-      await _player!.stop();
+      await _player!.stop().timeout(_controlTimeout);
     }
   }
 
   Future<void> seek(Duration position) async {
+    debugPrint(
+        '⏩ [PlaybackService] seek() called, serviceId=$_serviceId, player=${_player?.hashCode}');
     if (_initialized && _player != null) {
-      await _player!.seek(position);
+      await _player!.seek(position).timeout(_controlTimeout);
     }
   }
 
@@ -76,6 +131,8 @@ class PlaybackService {
 
   // ---------- 释放 ----------
   void dispose() {
+    debugPrint(
+        '🗑️ [PlaybackService] dispose() called, serviceId=$_serviceId, player=${_player?.hashCode}');
     if (_initialized && _player != null) {
       _player!.dispose();
       _player = null;
@@ -83,8 +140,10 @@ class PlaybackService {
     }
   }
 
-  // ---------- 重新初始化（用于 Hot Restart 场景） ----------
+  // ---------- 重新初始化 ----------
   void reinitialize() {
+    debugPrint(
+        '🔄 [PlaybackService] reinitialize() called, serviceId=$_serviceId');
     dispose();
     init();
   }

lib/services/player_service.dart

@@ -1,32 +0,0 @@
-import 'package:media_kit/media_kit.dart';
-
-class PlayerService {
-  static final PlayerService _instance = PlayerService._internal();
-
-  factory PlayerService() => _instance;
-
-  PlayerService._internal();
-
-  Player? _player;
-
-  Player get player {
-    return _player ??= Player();
-  }
-
-  void play(String url) {
-    player.open(Media(url));
-  }
-
-  void pause() => player.pause();
-
-  void resume() => player.play();
-
-  void stop() => player.stop();
-
-  void dispose() {
-    _player?.dispose();
-    _player = null;
-  }
-
-  // 状态监听...
-}

lib/services/prefetch_service.dart

@@ -0,0 +1,68 @@
+// lib/services/prefetch_service.dart
+import 'package:dio/dio.dart';
+import 'package:flutter/foundation.dart';
+
+import 'webdav_service.dart';
+
+/// 下一首预热。
+///
+/// 目的：在用户真正切歌之前，提前完成 DNS 解析、TLS 握手、反代/CDN 的首包，
+/// 让 mpv 起播时少等一会儿。
+///
+/// 只发 HEAD + `Range: bytes=0-0`，不下载正文，带宽开销可以忽略；
+/// 失败也完全静默，不影响当前播放。
+class PrefetchService {
+  static final PrefetchService _instance = PrefetchService._internal();
+  factory PrefetchService() => _instance;
+  PrefetchService._internal();
+
+  final Dio _dio = Dio();
+
+  String? _lastUrl;
+  bool _busy = false;
+
+  Future<void> warm(String url) async {
+    if (url.isEmpty) return;
+    if (_busy) return;
+    if (_lastUrl == url) return;
+
+    _busy = true;
+    _lastUrl = url;
+
+    final sw = Stopwatch()..start();
+    try {
+      final headers = await WebDAVService.instance.getAuthHeaders();
+      if (headers.isEmpty) return;
+
+      final response = await _dio.head(
+        url,
+        options: Options(
+          headers: {
+            ...headers,
+            'Range': 'bytes=0-0',
+          },
+          receiveTimeout: const Duration(seconds: 8),
+          sendTimeout: const Duration(seconds: 5),
+          // HEAD 返回 4xx/5xx 也不抛异常，交给日志记录
+          validateStatus: (_) => true,
+        ),
+      );
+
+      debugPrint('🔥 [Prefetch] 预热完成 ${sw.elapsedMilliseconds}ms，'
+          'status=${response.statusCode}');
+    } catch (e) {
+      debugPrint('⚠️ [Prefetch] 预热失败（忽略）: $e');
+    } finally {
+      _busy = false;
+      // 允许同一首歌在下一轮重新预热（比如重播）
+      if (_lastUrl == url) {
+        // 保留 _lastUrl 做去重，下一次换歌时会被覆盖
+      }
+    }
+  }
+
+  /// 切歌/停止时清掉去重状态
+  void reset() {
+    _lastUrl = null;
+  }
+}

lib/utils/song_key.dart

@@ -0,0 +1,18 @@
+// lib/utils/song_key.dart
+import 'dart:convert';
+import 'package:crypto/crypto.dart';
+
+/// 歌曲缓存键（song_key）。
+///
+/// 只用 URL：元数据读取是"分阶段取头部"的，第一次可能只取 128KB、
+/// 第二次补到 512KB。如果键里带文件大小，两次会得到不同的键，缓存立刻失效；
+/// URL 在这些阶段之间是稳定的。
+///
+/// 代价：同一个 URL 换了文件内容时不会自动失效，由"清除单曲缓存 /
+/// forceRefresh"兜底。
+String songKeyFor(String url) {
+  return md5.convert(utf8.encode(url)).toString();
+}
+
+/// 语义化别名，用于临时文件命名等场景。
+String songKeyForUrl(String url) => songKeyFor(url);

lib/widgets/full_player_page.dart

@@ -1,116 +0,0 @@
-// lib/widgets/full_player_page.dart
-import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
-import '../services/audio_service.dart';
-
-class FullPlayerPage extends StatelessWidget {
-  const FullPlayerPage({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    final service = context.watch<AudioService>();
-    final song = service.currentSong!;
-
-    return Scaffold(
-      backgroundColor: const Color(0xFF0E1211),
-      appBar: AppBar(
-        backgroundColor: Colors.transparent,
-        elevation: 0,
-        leading: IconButton(
-          icon: const Icon(Icons.arrow_back_ios_new),
-          onPressed: () => Navigator.pop(context),
-        ),
-        actions: [
-          IconButton(
-            icon: const Icon(Icons.playlist_play_outlined),
-            onPressed: () {},
-          ),
-        ],
-      ),
-      body: Padding(
-        padding: const EdgeInsets.symmetric(horizontal: 24),
-        child: Column(
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: [
-            Container(
-              width: 280,
-              height: 280,
-              decoration: BoxDecoration(
-                shape: BoxShape.circle,
-                color: const Color(0xFF2A3332),
-                boxShadow: [
-                  BoxShadow(
-                    color: const Color(0xFF7C9A9E).withOpacity(0.2),
-                    blurRadius: 60,
-                    spreadRadius: 10,
-                  ),
-                ],
-              ),
-              child:
-                  const Icon(Icons.music_note, size: 80, color: Colors.white24),
-            ),
-            const SizedBox(height: 60),
-            Text(
-              song.title,
-              style: const TextStyle(fontSize: 24, fontWeight: FontWeight.w600),
-              textAlign: TextAlign.center,
-            ),
-            const SizedBox(height: 8),
-            Text(
-              song.artist,
-              style: TextStyle(fontSize: 16, color: Colors.grey[400]),
-            ),
-            const SizedBox(height: 40),
-            Slider(
-              value: 0.3,
-              onChanged: (v) {},
-              activeColor: const Color(0xFFB8D4D0),
-              inactiveColor: Colors.grey[800],
-            ),
-            const SizedBox(height: 20),
-            Row(
-              mainAxisAlignment: MainAxisAlignment.center,
-              children: [
-                IconButton(
-                  onPressed: () {},
-                  icon: const Icon(Icons.skip_previous, size: 32),
-                  color: Colors.white60,
-                ),
-                const SizedBox(width: 20),
-                CircleAvatar(
-                  radius: 32,
-                  backgroundColor: const Color(0xFF7C9A9E),
-                  child: IconButton(
-                    icon: Icon(
-                      service.isPlaying ? Icons.pause : Icons.play_arrow,
-                      color: Colors.black87,
-                      size: 32,
-                    ),
-                    onPressed: () => context.read<AudioService>().togglePlay(),
-                  ),
-                ),
-                const SizedBox(width: 20),
-                IconButton(
-                  onPressed: () {},
-                  icon: const Icon(Icons.skip_next, size: 32),
-                  color: Colors.white60,
-                ),
-              ],
-            ),
-            const SizedBox(height: 30),
-            Row(
-              mainAxisAlignment: MainAxisAlignment.center,
-              children: [
-                IconButton(
-                  onPressed: () {},
-                  icon: const Icon(Icons.volume_up_outlined),
-                  color: Colors.white38,
-                ),
-              ],
-            )
-          ],
-        ),
-      ),
-    );
-  }
-}

lib/widgets/song_artwork.dart

@@ -0,0 +1,72 @@
+// lib/widgets/song_artwork.dart
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+
+/// 歌曲封面：优先进内存字节，其次本地封面文件，最后回退图标。
+///
+/// 列表页一次会构建几十行，这里用 `existsSync` 判断一次即可，
+/// 图片本身由 Flutter 按需解码。
+class SongArtwork extends StatelessWidget {
+  final Uint8List? bytes;
+  final String? filePath;
+  final double size;
+  final IconData fallbackIcon;
+  final Color? fallbackColor;
+
+  const SongArtwork({
+    super.key,
+    this.bytes,
+    this.filePath,
+    this.size = 44,
+    this.fallbackIcon = Icons.music_note,
+    this.fallbackColor,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    Widget child;
+    if (bytes != null && bytes!.isNotEmpty) {
+      child = Image.memory(
+        bytes!,
+        width: size,
+        height: size,
+        fit: BoxFit.cover,
+        gaplessPlayback: true,
+        errorBuilder: (_, __, ___) => _fallback(),
+      );
+    } else if (filePath != null &&
+        filePath!.isNotEmpty &&
+        File(filePath!).existsSync()) {
+      child = Image.file(
+        File(filePath!),
+        width: size,
+        height: size,
+        fit: BoxFit.cover,
+        gaplessPlayback: true,
+        errorBuilder: (_, __, ___) => _fallback(),
+      );
+    } else {
+      child = _fallback();
+    }
+
+    return ClipRRect(
+      borderRadius: BorderRadius.circular(6),
+      child: SizedBox(width: size, height: size, child: child),
+    );
+  }
+
+  Widget _fallback() {
+    return Container(
+      width: size,
+      height: size,
+      color: const Color(0xFF232928),
+      child: Icon(
+        fallbackIcon,
+        size: size * 0.55,
+        color: fallbackColor ?? const Color(0xFFB8D4D0),
+      ),
+    );
+  }
+}

pubspec.lock

@@ -13,10 +13,10 @@ packages:
     dependency: transitive
     description:
       name: archive
-      sha256: a96e8b390886ee8abb49b7bd3ac8df6f451c621619f52a26e815fdcf568959ff
+      sha256: ace891da0862b0e4cabbb064ee3fd87b2728b898949fdb366d83fe98342c9f19
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "4.0.9"
+    version: "4.2.0"
   args:
     dependency: transitive
     description:
@@ -101,18 +101,18 @@ packages:
     dependency: transitive
     description:
       name: clock
-      sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
+      sha256: e51d50bca3217c9a9fa2b41a30e4a38971133f5f9ec7a3d57bae095007f1d28e
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.2"
+    version: "1.1.3"
   code_assets:
     dependency: transitive
     description:
       name: code_assets
-      sha256: bf394f466ba9205f1812a0433b392d6af280f155f56651eda7c18cc32ed493b8
+      sha256: cfd4f5f575a49c5f10ca856e9846073f1e6c3ee94912377eea5f6cefc5272941
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.1"
+    version: "2.0.0"
   collection:
     dependency: transitive
     description:
@@ -220,10 +220,10 @@ packages:
     dependency: transitive
     description:
       name: hooks
-      sha256: "9a62a50b50b769a737bc0a8ff381f333529df3ab746b2f6b02e83760231455ba"
+      sha256: eaac480a35ec0814146c2c48d96aaa829e0e44a7662c88ae84c9edf4bc35651f
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.2"
+    version: "2.2.0"
   http:
     dependency: transitive
     description:
@@ -244,10 +244,10 @@ packages:
     dependency: transitive
     description:
       name: image
-      sha256: f9881ff4998044947ec38d098bc7c8316ae1186fa786eddffdb867b9bc94dfce
+      sha256: "1976370a4df3091bb0f72409c187ad1f9132a818bc6b95ca59c0bae1c75c688e"
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "4.8.0"
+    version: "4.9.2"
   intl:
     dependency: transitive
     description:
@@ -268,10 +268,10 @@ packages:
     dependency: transitive
     description:
       name: jni_flutter
-      sha256: "7b717011ea40d04fd47c2731d3d1d36eb99eba3435c2753d62489e8c3c9991d5"
+      sha256: b2310cdd4c18c65c081ab141a41efa94aa26c65431803703ece51996f174f351
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.2"
+    version: "1.0.3"
   jni_util:
     dependency: transitive
     description:
@@ -284,10 +284,10 @@ packages:
     dependency: transitive
     description:
       name: js
-      sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3
+      sha256: "53385261521cc4a0c4658fd0ad07a7d14591cf8fc33abbceae306ddb974888dc"
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.6.7"
+    version: "0.7.2"
   leak_tracker:
     dependency: transitive
     description:
@@ -412,10 +412,10 @@ packages:
     dependency: transitive
     description:
       name: mime
-      sha256: "41a20518f0cb1256669420fdba0cd90d21561e560ac240f26ef8322e45bb7ed6"
+      sha256: bd47de35f07e27267e69c8c8b22edf9473bfee170a60d60fcc93730c5144b7f6
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   nested:
     dependency: transitive
     description:
@@ -428,10 +428,10 @@ packages:
     dependency: transitive
     description:
       name: objective_c
-      sha256: b7fb95a6d9a4f009edd63dc5ac69f07420b23a16161c6dd8660290b59c602e8e
+      sha256: ad56fd53a78ff6b1472fa59ff2a4e8b8ccabafc586fc263a1dfad0b99b5553e3
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "9.5.0"
+    version: "9.6.0"
   package_config:
     dependency: transitive
     description:
@@ -588,18 +588,18 @@ packages:
     dependency: transitive
     description:
       name: pub_semver
-      sha256: "5bfcf68ca79ef689f8990d1160781b4bad40a3bd5e5218ad4076ddb7f4081585"
+      sha256: "261236774e8b1d69cfc6b9eabbc96c40f25e7a2d6b171f3385d4f65d5734fb24"
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.2.0"
+    version: "2.2.1"
   record_use:
     dependency: transitive
     description:
       name: record_use
-      sha256: "2551bd8eecfe95d14ae75f6021ad0248be5c27f138c2ec12fcb52b500b3ba1ed"
+      sha256: "1cb8564af8d43b464294411db9217f5ec04891c6f22ee2c32d73ae05e88a6bd2"
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.6.0"
+    version: "1.1.1"
   rxdart:
     dependency: transitive
     description:
@@ -628,18 +628,18 @@ packages:
     dependency: transitive
     description:
       name: shared_preferences_android
-      sha256: "0634e64bd719f89c012f392938e173521f535d3ecaf66558fa94a056d22b5cc7"
+      sha256: "1e12aafe408aa50da80edfd679a2a6bf63ba7ab37c7fa98286da459a757b3399"
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.4.27"
+    version: "2.4.28"
   shared_preferences_foundation:
     dependency: transitive
     description:
       name: shared_preferences_foundation
-      sha256: "4e7eaffc2b17ba398759f1151415869a34771ba11ebbccd1b0145472a619a64f"
+      sha256: "2ec3934efa51e46117f23031cc141b8fc878e8525b94ec1ea4f7f586cf1b47ea"
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.5.6"
+    version: "2.5.7"
   shared_preferences_linux:
     dependency: transitive
     description:
@@ -729,10 +729,10 @@ packages:
     dependency: transitive
     description:
       name: stack_trace
-      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
+      sha256: "277654b3034d17ac6f9f1cb5595db011b1d5d41e8806866db28e0abaa101c490"
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.12.1"
+    version: "1.12.2"
   stream_channel:
     dependency: transitive
     description:
@@ -817,10 +817,10 @@ packages:
     dependency: transitive
     description:
       name: vm_service
-      sha256: "0016aef94fc66495ac78af5859181e3f3bf2026bd8eecc72b9565601e19ab360"
+      sha256: "5f37239c4851efcef929cea7824e76df7f2f0970aef85d66bbc430afa40e72f0"
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "15.2.0"
+    version: "15.3.0"
   web:
     dependency: transitive
     description:
@@ -849,10 +849,10 @@ packages:
     dependency: transitive
     description:
       name: yaml
-      sha256: b9da305ac7c39faa3f030eccd175340f968459dae4af175130b3fc47e40d76ce
+      sha256: f67cdd8e07d3c6329146aaef1ba043542b3134c12489f553ca9a7435d1068aea
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "3.1.3"
+    version: "3.1.4"
 sdks:
   dart: ">=3.12.0 <4.0.0"
   flutter: ">=3.44.0"

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.1.0+1
+version: 1.1.0-dev.1+2
 
 environment:
   sdk: ^3.0.0
@@ -36,7 +36,7 @@ dependencies:
   provider: ^6.1.2
   dio: ^5.4.0         # HTTP 客户端
   xml: ^6.5.0
-  audio_service: ^0.18.19
+  audio_service: 0.18.19
   audio_session: ^0.1.21
   permission_handler: ^11.3.1
   flutter_cache_manager: ^3.3.1

readme-2.md

@@ -684,3 +684,6 @@ await AudioService.start(
 > **清听**：这是一个播放器应该如何让用户忘记系统正在运行。
 
 两个项目共享同一套工程哲学，但拥有各自独立的文档骨架。
+
+大樱子留：
+26.10.22-23:22  多实例问题已修复，接下来会将代码合并到main分支，大肥鱼立功一件，有时候harness确实很有意义

test/metadata_normalizer_test.dart

@@ -0,0 +1,140 @@
+// test/metadata_normalizer_test.dart
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qingting_player/metadata/metadata_model.dart';
+import 'package:qingting_player/metadata/metadata_normalizer.dart';
+
+void main() {
+  final normalizer = MetadataNormalizer();
+
+  RawMetadata raw({
+    String title = '',
+    String artist = '',
+    String album = '',
+    int year = 0,
+  }) =>
+      RawMetadata(title: title, artist: artist, album: album, year: year);
+
+  group('normalize 字段来源', () {
+    test('标签齐全时三个字段都标记为来自标签', () {
+      final n = normalizer.normalize(
+        raw(title: '夜曲', artist: '周杰伦', album: '十一月的萧邦'),
+        fileName: 'track01.mp3',
+        filePath: '/音乐/周杰伦/track01.mp3',
+      );
+      expect(n.title, '夜曲');
+      expect(n.artist, '周杰伦');
+      expect(n.album, '十一月的萧邦');
+      expect(n.titleFromTag, isTrue);
+      expect(n.artistFromTag, isTrue);
+      expect(n.albumFromTag, isTrue);
+    });
+
+    test('没有标签时回退到文件名与目录', () {
+      final n = normalizer.normalize(
+        raw(),
+        fileName: '晴天.mp3',
+        filePath: '/音乐/周杰伦/晴天.mp3',
+      );
+      expect(n.title, '晴天');
+      expect(n.artist, '周杰伦');
+      expect(n.titleFromTag, isFalse);
+      expect(n.artistFromTag, isFalse);
+    });
+  });
+
+  group('evaluate 置信度分级', () {
+    NormalizedMetadata norm({
+      required String title,
+      required String artist,
+      String album = '',
+      bool titleTag = true,
+      bool artistTag = true,
+      bool albumTag = false,
+    }) =>
+        NormalizedMetadata(
+          title: title,
+          artist: artist,
+          album: album,
+          titleFromTag: titleTag,
+          artistFromTag: artistTag,
+          albumFromTag: albumTag,
+        );
+
+    test('标题 + 艺术家 + 专辑 → 0.90', () {
+      final c = normalizer.evaluate(
+        norm(title: '夜曲', artist: '周杰伦', album: '十一月的萧邦', albumTag: true),
+        const [],
+      );
+      expect(c.confidence, closeTo(0.90, 0.001));
+    });
+
+    test('只有标题和艺术家 → 0.80', () {
+      final c = normalizer.evaluate(norm(title: '夜曲', artist: '周杰伦'), const []);
+      expect(c.confidence, closeTo(0.80, 0.001));
+    });
+
+    test('只有文件名（无标签）→ 0.35，低于阈值', () {
+      final c = normalizer.evaluate(
+        norm(title: 'track01', artist: '未知艺术家', titleTag: false, artistTag: false),
+        const [],
+      );
+      expect(c.confidence, closeTo(0.35, 0.001));
+      expect(c.confidence < 0.6, isTrue);
+    });
+
+    test('历史一致性加权：同艺人 ≥2 条 → +0.05', () {
+      final history = [
+        {'artist': '周杰伦', 'album': ''},
+        {'artist': '周杰伦', 'album': ''},
+      ];
+      final c = normalizer.evaluate(
+        norm(title: '夜曲', artist: '周杰伦'),
+        history,
+      );
+      expect(c.confidence, closeTo(0.85, 0.001));
+      expect(c.evidence['artist_history'], 0.05);
+    });
+
+    test('证据可解释：每一项加分都有记录', () {
+      final c = normalizer.evaluate(
+        norm(title: '夜曲', artist: '周杰伦', album: '十一月的萧邦', albumTag: true),
+        const [],
+      );
+      expect(c.evidence.containsKey('base'), isTrue);
+      expect(c.evidence.containsKey('title_from_tag'), isTrue);
+      expect(c.evidence.containsKey('artist_from_tag'), isTrue);
+      expect(c.evidence.containsKey('album'), isTrue);
+    });
+  });
+
+  group('decide 阈值', () {
+    test('高于阈值时 source=normalized', () {
+      final c = normalizer.evaluate(
+        const NormalizedMetadata(
+          title: '夜曲',
+          artist: '周杰伦',
+          titleFromTag: true,
+          artistFromTag: true,
+        ),
+        const [],
+      );
+      final f = normalizer.decide(c);
+      expect(f.source, 'normalized');
+      expect(f.title, '夜曲');
+    });
+
+    test('低于阈值时 source=pending', () {
+      final c = normalizer.evaluate(
+        const NormalizedMetadata(
+          title: 'track01',
+          artist: '未知艺术家',
+          titleFromTag: false,
+          artistFromTag: false,
+        ),
+        const [],
+      );
+      final f = normalizer.decide(c);
+      expect(f.source, 'pending');
+    });
+  });
+}

test/metadata_stability_test.dart

@@ -0,0 +1,124 @@
+// test/metadata_stability_test.dart
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qingting_player/metadata/metadata_model.dart';
+import 'package:qingting_player/metadata/metadata_stability.dart';
+
+void main() {
+  CandidateMetadata candidate({double confidence = 0.8}) => CandidateMetadata(
+        metadata: const NormalizedMetadata(title: '夜曲', artist: '周杰伦'),
+        confidence: confidence,
+      );
+
+  group('MetadataStability', () {
+    test('首次见到 → pending，次数 1', () {
+      final d = MetadataStability.decide(
+        previous: null,
+        candidate: candidate(),
+        title: '夜曲',
+        artist: '周杰伦',
+      );
+      expect(d.status, 'pending');
+      expect(d.reason, 'first_seen');
+      expect(d.validationCount, 1);
+    });
+
+    test('第二次结果一致且置信度达标 → verified', () {
+      final d = MetadataStability.decide(
+        previous: {
+          'title': '夜曲',
+          'artist': '周杰伦',
+          'confidence': 0.8,
+          'validation_count': 1,
+        },
+        candidate: candidate(),
+        title: '夜曲',
+        artist: '周杰伦',
+      );
+      expect(d.status, 'verified');
+      expect(d.reason, 'stable');
+      expect(d.validationCount, 2);
+    });
+
+    test('标题或艺术家冲突 → 次数重置为 1，保持 pending', () {
+      final d = MetadataStability.decide(
+        previous: {
+          'title': '夜曲',
+          'artist': '周杰伦',
+          'confidence': 0.9,
+          'validation_count': 5,
+        },
+        candidate: candidate(),
+        title: '完全不同的歌',
+        artist: '别的歌手',
+      );
+      expect(d.status, 'pending');
+      expect(d.reason, 'conflict');
+      expect(d.validationCount, 1);
+    });
+
+    test('置信度不足 → pending，但次数继续累计', () {
+      final d = MetadataStability.decide(
+        previous: {
+          'title': '夜曲',
+          'artist': '周杰伦',
+          'confidence': 0.4,
+          'validation_count': 3,
+        },
+        candidate: candidate(confidence: 0.5),
+        title: '夜曲',
+        artist: '周杰伦',
+      );
+      expect(d.status, 'pending');
+      expect(d.reason, 'low_confidence');
+      expect(d.validationCount, 4);
+    });
+
+    test('一致但只验证过一次 → pending', () {
+      final d = MetadataStability.decide(
+        previous: {
+          'title': '夜曲',
+          'artist': '周杰伦',
+          'confidence': 0.8,
+          'validation_count': 0,
+        },
+        candidate: candidate(),
+        title: '夜曲',
+        artist: '周杰伦',
+      );
+      expect(d.status, 'pending');
+      expect(d.reason, 'need_second_validation');
+      expect(d.validationCount, 1);
+    });
+
+    test('字段缺失不算冲突（旧记录没有艺术家）', () {
+      final d = MetadataStability.decide(
+        previous: {
+          'title': '夜曲',
+          'artist': '',
+          'confidence': 0.7,
+          'validation_count': 1,
+        },
+        candidate: candidate(),
+        title: '夜曲',
+        artist: '周杰伦',
+      );
+      expect(d.status, 'verified');
+      expect(d.validationCount, 2);
+    });
+
+    test('大小写与首尾空格不影响一致性判断', () {
+      final d = MetadataStability.decide(
+        previous: {
+          'title': ' Night Song ',
+          'artist': 'JAY',
+          'confidence': 0.8,
+          'validation_count': 1,
+        },
+        candidate: candidate(),
+        title: 'night song',
+        artist: 'jay',
+      );
+      expect(d.status, 'verified');
+    });
+  });
+}

test/song_key_test.dart

@@ -0,0 +1,24 @@
+// test/song_key_test.dart
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qingting_player/utils/song_key.dart';
+
+void main() {
+  group('songKeyFor', () {
+    test('同一 URL 多次计算结果一致（跨进程稳定）', () {
+      const url = 'https://example.com/dav/music/a.flac';
+      expect(songKeyFor(url), songKeyFor(url));
+    });
+
+    test('与探测大小无关：不同阶段的头部请求得到同一个键', () {
+      // 键只依赖 URL，因此 128KB / 512KB 两次探测不会产生两个缓存键
+      const url = 'https://example.com/dav/music/b.flac';
+      final key = songKeyFor(url);
+      expect(key, songKeyForUrl(url));
+      expect(key.length, 32); // md5 十六进制
+    });
+
+    test('不同 URL 得到不同键', () {
+      expect(songKeyFor('https://x/a.flac'), isNot(songKeyFor('https://x/b.flac')));
+    });
+  });
+}

tools/device-check.ps1

@@ -0,0 +1,143 @@
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+    清听真机自检：安装最新 debug APK，冷启动，抓 logcat，校验 libmpv 是否只有单实例。
+
+.DESCRIPTION
+    判定依据：
+      - 冷启动后 "PlaybackService 单例创建" 只出现一次；
+      - 日志里出现过的 serviceId 只有 1 个；
+      - media_kit Player 的 hashCode 只有 1 个。
+
+.EXAMPLE
+    powershell -ExecutionPolicy Bypass -File tools\device-check.ps1
+    powershell -ExecutionPolicy Bypass -File tools\device-check.ps1 -DeviceId 192.168.3.2:36569
+#>
+[CmdletBinding()]
+param(
+    [string]$DeviceId = '',
+    [string]$Apk = '',
+    [int]$WaitSeconds = 12,
+    # 默认校验 debug 包（_dev 后缀），与 release 包并存安装
+    [string]$Package = 'com.lxh.qingting_player.dev'
+)
+
+$ErrorActionPreference = 'Continue'  # adb 会往 stderr 写正常提示，用 Stop 会误判
+$root = Split-Path -Parent $PSScriptRoot
+if (-not $Apk) { $Apk = Join-Path $root 'build\app\outputs\flutter-apk\app-debug.apk' }
+$pkg = $Package
+
+function Write-Step($msg) { Write-Host "==> $msg" -ForegroundColor Cyan }
+function Write-Ok($msg) { Write-Host "  OK  $msg" -ForegroundColor Green }
+function Write-Bad($msg) { Write-Host "  !!  $msg" -ForegroundColor Red }
+
+if (-not (Get-Command adb -ErrorAction SilentlyContinue)) {
+    throw '未找到 adb，请把 platform-tools 加入 PATH'
+}
+if (-not (Test-Path $Apk)) {
+    throw "APK 不存在：$Apk（先执行 gradlew assembleDebug）"
+}
+
+# ---------- 选择设备 ----------
+# 同一台手机可能同时存在多条 adb 通道（如无线调试 + mDNS），按 serialno 去重
+$devices = @(adb devices | Select-Object -Skip 1 | Where-Object { $_ -match '\sdevice$' } | ForEach-Object { ($_ -split '\s+')[0] })
+if ($DeviceId) {
+    if ($devices -notcontains $DeviceId) { throw "设备 $DeviceId 不在线，当前：$($devices -join ', ')" }
+} elseif ($devices.Count -eq 0) {
+    throw '没有在线设备，请先连接手机并授权 USB/无线调试'
+} elseif ($devices.Count -eq 1) {
+    $DeviceId = $devices[0]
+} else {
+    $bySerial = @{}
+    foreach ($entry in $devices) {
+        $serial = (& adb -s $entry shell getprop ro.serialno 2>$null | Out-String).Trim()
+        if ($serial) { $bySerial[$serial] = $entry }
+    }
+    if ($bySerial.Count -eq 1) {
+        $DeviceId = @($bySerial.Values)[0]
+        Write-Host "  (同一设备的多条 adb 通道，使用 $DeviceId)" -ForegroundColor DarkGray
+    } else {
+        throw "检测到多台设备，请用 -DeviceId 指定：$($devices -join ', ')"
+    }
+}
+
+$adb = { param($args) & adb -s $DeviceId @args }
+$model = (& adb -s $DeviceId shell getprop ro.product.model).Trim()
+$android = (& adb -s $DeviceId shell getprop ro.build.version.release).Trim()
+Write-Step "设备 $model (Android $android)  [$DeviceId]"
+
+# ---------- 安装 ----------
+Write-Step "安装 $([IO.Path]::GetFileName($Apk))"
+$install = & adb -s $DeviceId install -r $Apk 2>&1
+if (($install -join "`n") -notmatch 'Success') { Write-Bad ($install -join "`n"); exit 1 }
+Write-Ok '安装成功'
+
+# ---------- 冷启动 ----------
+Write-Step '冷启动并抓取日志'
+$logPath = Join-Path $root 'build\device-check-last.log'
+$creates = 0
+# Flyme 有时不会立刻杀掉带前台服务的进程，导致抓不到启动日志：确认进程消失 + 最多重试两次
+for ($attempt = 1; $attempt -le 2; $attempt++) {
+    & adb -s $DeviceId shell am force-stop $pkg | Out-Null
+    $deadline = (Get-Date).AddSeconds(10)
+    while ((& adb -s $DeviceId shell pidof $pkg) -and (Get-Date) -lt $deadline) {
+        Start-Sleep -Milliseconds 300
+    }
+    # 进程还在说明被系统冻结/保活，直接等到超时也无意义，先给它一点时间解冻
+    Start-Sleep -Seconds 1
+    & adb -s $DeviceId logcat -c
+    # 解析真正的启动组件再启动：applicationId 带 .dev 后缀时，
+    # "$pkg/.MainActivity" 会把 .MainActivity 拼到 .dev 上导致找不到类；
+    # 而 "am start -p $pkg" 在部分 ROM 上又解析不到，所以直接问 PackageManager。
+    $component = (& adb -s $DeviceId shell cmd package resolve-activity --brief $pkg 2>&1 | Select-Object -Last 1).Trim()
+    & adb -s $DeviceId shell am start -W -n $component 2>&1 | Out-Null
+    # 第一次按参数等待；第二次重试时多等一会儿（Flyme 解冻可能很慢）
+    $waitThisTime = if ($attempt -eq 1) { $WaitSeconds } else { [Math]::Max($WaitSeconds, 20) }
+    Start-Sleep -Seconds $waitThisTime
+    & adb -s $DeviceId logcat -d -v time > $logPath
+    # 注意：PS 5.1 的 > 重定向写出的是 UTF-16LE（带 BOM），读取时不要强制 utf8
+    $log = Get-Content $logPath
+    $text = $log -join "`n"
+    $creates = ([regex]::Matches($text, '\[PlaybackService\] 单例创建')).Count
+    if ($creates -ge 1) { break }
+    Write-Host "  (第 $attempt 次没抓到冷启动日志，进程可能没退干净，重试)" -ForegroundColor DarkYellow
+}
+
+# ---------- 判定 ----------
+Write-Step '实例检查'
+$serviceIds = @([regex]::Matches($text, 'serviceId=(\d+)') | ForEach-Object { $_.Groups[1].Value } | Sort-Object -Unique)
+$players = @([regex]::Matches($text, 'Player 已创建.*?player=(\d+)') | ForEach-Object { $_.Groups[1].Value } | Sort-Object -Unique)
+
+$failed = $false
+if ($creates -eq 1) { Write-Ok "PlaybackService 单例创建 x$creates" } else { Write-Bad "PlaybackService 单例创建 x$creates（应为 1）"; $failed = $true }
+if ($serviceIds.Count -eq 1) { Write-Ok "serviceId 唯一：$($serviceIds[0])" } else { Write-Bad "出现 $($serviceIds.Count) 个 serviceId：$($serviceIds -join ', ')"; $failed = $true }
+if ($players.Count -eq 1) { Write-Ok "Player 唯一：$($players[0])" } else { Write-Bad "出现 $($players.Count) 个 Player：$($players -join ', ')"; $failed = $true }
+
+# ---------- 系统侧 ----------
+Write-Step '系统 MediaSession'
+$sessionIds = @(& adb -s $DeviceId shell dumpsys media_session 2>&1 |
+    Select-String ("media-session " + [regex]::Escape($pkg) + "/media-session/(\d+)") |
+    ForEach-Object { $_.Matches[0].Groups[1].Value } | Sort-Object -Unique)
+if ($sessionIds.Count -eq 1) { Write-Ok "MediaSession 唯一：$($sessionIds[0])" }
+elseif ($sessionIds.Count -eq 0) { Write-Host '  -- 还没有 MediaSession（未开始播放，属正常）' -ForegroundColor DarkGray }
+else { Write-Bad "出现 $($sessionIds.Count) 个 MediaSession：$($sessionIds -join ', ')"; $failed = $true }
+
+# ---------- 崩溃 / 加载失败 ----------
+Write-Step '崩溃与原生库'
+$bad = $log | Select-String 'FATAL EXCEPTION|UnsatisfiedLinkError|Cannot load MediaKitAndroidHelper|Could not load'
+if ($bad) { $bad | Select-Object -First 5 | ForEach-Object { Write-Bad $_.Line.Trim() }; $failed = $true } else { Write-Ok '无崩溃、无 so 加载失败' }
+
+# ---------- 结果 ----------
+Write-Host ''
+if ($failed) {
+    Write-Host 'RESULT: FAIL —— 仍存在多实例或异常，完整日志：' -ForegroundColor Red
+    Write-Host "  $logPath"
+    exit 1
+}
+Write-Host 'RESULT: PASS —— 单引擎单实例' -ForegroundColor Green
+Write-Host "日志：$logPath"
+Write-Host ''
+Write-Host '还需要你手动确认（脚本无法代替耳朵和眼睛）：' -ForegroundColor Yellow
+Write-Host '  1. 放一首歌，确认只有一路声音（没有重影/叠音）'
+Write-Host '  2. 按通知栏暂停/播放，确认播放页状态同步变化'
+Write-Host '  3. 拖通知栏进度条，确认播放页进度跟着走'