引入部分缓存机制

引入封面图信息

正在进入测试阶段

lib/utils/artwork_helper.dart

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+// lib/utils/artwork_helper.dart
+import 'dart:io';
+import 'dart:typed_data';
+import 'package:path_provider/path_provider.dart';
+
+class ArtworkHelper {
+  static const String _artworkDir = 'artworks';
+
+  /// 保存封面图到本地
+  static Future<String?> saveArtwork(Uint8List data, String songKey) async {
+    try {
+      final dir = await getApplicationDocumentsDirectory();
+      final artworkDir = Directory('${dir.path}/$_artworkDir');
+      if (!await artworkDir.exists()) {
+        await artworkDir.create(recursive: true);
+      }
+
+      final path = '${artworkDir.path}/$songKey.jpg';
+      final file = File(path);
+      await file.writeAsBytes(data);
+      return path;
+    } catch (e) {
+      return null;
+    }
+  }
+
+  /// 获取封面图文件
+  static Future<File?> getArtwork(String songKey) async {
+    try {
+      final dir = await getApplicationDocumentsDirectory();
+      final path = '${dir.path}/$_artworkDir/$songKey.jpg';
+      final file = File(path);
+      if (await file.exists()) {
+        return file;
+      }
+      return null;
+    } catch (e) {
+      return null;
+    }
+  }
+
+  /// 删除封面图
+  static Future<void> deleteArtwork(String songKey) async {
+    try {
+      final dir = await getApplicationDocumentsDirectory();
+      final path = '${dir.path}/$_artworkDir/$songKey.jpg';
+      final file = File(path);
+      if (await file.exists()) {
+        await file.delete();
+      }
+    } catch (e) {
+      // ignore
+    }
+  }
+}