1

2026-10-25 16:14:26 +08:00
parent 7fae7387f5
commit 1d9cd1f9c7
10 changed files with 288 additions and 13 deletions
@@ -0,0 +1,79 @@
+import 'dart:convert';
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+/// Feed 播放进度持久化：记录每个策略最后观看的视频与播放位置，
+/// App 冷启动重新拉列表后按 videoId 定位，继续上次的视频。
+class FeedProgress {
+  const FeedProgress({
+    required this.videoId,
+    required this.index,
+    required this.positionMs,
+  });
+
+  final int videoId;
+  final int index;
+  final int positionMs;
+}
+
+class FeedProgressStore {
+  FeedProgressStore._(this._prefs);
+
+  final SharedPreferences _prefs;
+
+  static const String _prefix = 'feed_progress_';
+  static const String _lastStrategyKey = 'feed_last_strategy';
+
+  static FeedProgressStore? _instance;
+
+  /// 初始化（main 启动阶段调用）
+  static Future<void> init() async {
+    _instance = FeedProgressStore._(await SharedPreferences.getInstance());
+  }
+
+  /// 测试注入
+  static void initForTest(SharedPreferences prefs) {
+    _instance = FeedProgressStore._(prefs);
+  }
+
+  static FeedProgressStore get I => _instance!;
+
+  Future<void> save(
+    String strategy, {
+    required int videoId,
+    required int index,
+    required int positionMs,
+  }) async {
+    await _prefs.setString(
+      '$_prefix$strategy',
+      jsonEncode({
+        'videoId': videoId,
+        'index': index,
+        'positionMs': positionMs,
+      }),
+    );
+  }
+
+  FeedProgress? read(String strategy) {
+    final raw = _prefs.getString('$_prefix$strategy');
+    if (raw == null) return null;
+    try {
+      final map = jsonDecode(raw) as Map<String, dynamic>;
+      final videoId = (map['videoId'] as num?)?.toInt() ?? 0;
+      if (videoId <= 0) return null;
+      return FeedProgress(
+        videoId: videoId,
+        index: (map['index'] as num?)?.toInt() ?? 0,
+        positionMs: (map['positionMs'] as num?)?.toInt() ?? 0,
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
+  Future<void> saveLastStrategy(String strategy) async {
+    await _prefs.setString(_lastStrategyKey, strategy);
+  }
+
+  String? readLastStrategy() => _prefs.getString(_lastStrategyKey);
+}