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lib/services/background_sync_service.dart

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+import 'dart:async';
+import 'time_tracking_service.dart';
+import 'statistics_service.dart';
+
+/// 后台同步服务 - 定期同步应用使用数据
+class BackgroundSyncService {
+  final TimeTrackingService _timeTrackingService = TimeTrackingService();
+  final StatisticsService _statisticsService = StatisticsService();
+  
+  Timer? _syncTimer;
+  bool _isRunning = false;
+
+  /// 启动后台同步
+  Future<void> start() async {
+    if (_isRunning) return;
+
+    _isRunning = true;
+    
+    // 立即同步一次
+    await syncNow();
+
+    // 每 15 分钟同步一次
+    _syncTimer = Timer.periodic(const Duration(minutes: 15), (timer) async {
+      await syncNow();
+    });
+
+    // 启动原生后台追踪
+    await _timeTrackingService.startBackgroundTracking();
+  }
+
+  /// 停止后台同步
+  Future<void> stop() async {
+    _isRunning = false;
+    _syncTimer?.cancel();
+    _syncTimer = null;
+    
+    await _timeTrackingService.stopBackgroundTracking();
+  }
+
+  /// 立即同步
+  Future<void> syncNow() async {
+    try {
+      print('Background sync: Starting sync...');
+      
+      // 同步今日数据
+      await _timeTrackingService.syncTodayData();
+      
+      // 刷新统计
+      await _statisticsService.refreshTodayStats();
+      
+      print('Background sync: Completed');
+    } catch (e) {
+      print('Background sync error: $e');
+    }
+  }
+
+  /// 检查是否正在运行
+  bool get isRunning => _isRunning;
+}
+