init

client/lib/core/storage/storage_service.dart

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+import 'package:shared_preferences/shared_preferences.dart';
+import 'dart:convert';
+
+/// 本地存储服务
+class StorageService {
+  static SharedPreferences? _prefs;
+  
+  /// 初始化存储服务
+  static Future<void> init() async {
+    _prefs = await SharedPreferences.getInstance();
+  }
+  
+  /// 获取SharedPreferences实例
+  static SharedPreferences get _instance {
+    if (_prefs == null) {
+      throw Exception('StorageService not initialized. Call StorageService.init() first.');
+    }
+    return _prefs!;
+  }
+  
+  /// 存储字符串
+  static Future<bool> setString(String key, String value) async {
+    return await _instance.setString(key, value);
+  }
+  
+  /// 获取字符串
+  static String? getString(String key) {
+    return _instance.getString(key);
+  }
+  
+  /// 存储整数
+  static Future<bool> setInt(String key, int value) async {
+    return await _instance.setInt(key, value);
+  }
+  
+  /// 获取整数
+  static int? getInt(String key) {
+    return _instance.getInt(key);
+  }
+  
+  /// 存储双精度浮点数
+  static Future<bool> setDouble(String key, double value) async {
+    return await _instance.setDouble(key, value);
+  }
+  
+  /// 获取双精度浮点数
+  static double? getDouble(String key) {
+    return _instance.getDouble(key);
+  }
+  
+  /// 存储布尔值
+  static Future<bool> setBool(String key, bool value) async {
+    return await _instance.setBool(key, value);
+  }
+  
+  /// 获取布尔值
+  static bool? getBool(String key) {
+    return _instance.getBool(key);
+  }
+  
+  /// 存储字符串列表
+  static Future<bool> setStringList(String key, List<String> value) async {
+    return await _instance.setStringList(key, value);
+  }
+  
+  /// 获取字符串列表
+  static List<String>? getStringList(String key) {
+    return _instance.getStringList(key);
+  }
+  
+  /// 存储对象（JSON序列化）
+  static Future<bool> setObject(String key, Map<String, dynamic> value) async {
+    final jsonString = jsonEncode(value);
+    return await setString(key, jsonString);
+  }
+  
+  /// 获取对象（JSON反序列化）
+  static Map<String, dynamic>? getObject(String key) {
+    final jsonString = getString(key);
+    if (jsonString == null) return null;
+    
+    try {
+      return jsonDecode(jsonString) as Map<String, dynamic>;
+    } catch (e) {
+      print('Error decoding JSON for key $key: $e');
+      return null;
+    }
+  }
+  
+  /// 存储对象列表（JSON序列化）
+  static Future<bool> setObjectList(String key, List<Map<String, dynamic>> value) async {
+    final jsonString = jsonEncode(value);
+    return await setString(key, jsonString);
+  }
+  
+  /// 获取对象列表（JSON反序列化）
+  static List<Map<String, dynamic>>? getObjectList(String key) {
+    final jsonString = getString(key);
+    if (jsonString == null) return null;
+    
+    try {
+      final decoded = jsonDecode(jsonString) as List;
+      return decoded.cast<Map<String, dynamic>>();
+    } catch (e) {
+      print('Error decoding JSON list for key $key: $e');
+      return null;
+    }
+  }
+  
+  /// 检查键是否存在
+  static bool containsKey(String key) {
+    return _instance.containsKey(key);
+  }
+  
+  /// 删除指定键
+  static Future<bool> remove(String key) async {
+    return await _instance.remove(key);
+  }
+  
+  /// 清空所有数据
+  static Future<bool> clear() async {
+    return await _instance.clear();
+  }
+  
+  /// 获取所有键
+  static Set<String> getKeys() {
+    return _instance.getKeys();
+  }
+  
+  /// 重新加载数据
+  static Future<void> reload() async {
+    await _instance.reload();
+  }
+}
+
+/// 存储键名常量
+class StorageKeys {
+  static const String accessToken = 'access_token';
+  static const String refreshToken = 'refresh_token';
+  static const String userInfo = 'user_info';
+  static const String appSettings = 'app_settings';
+  static const String learningProgress = 'learning_progress';
+  static const String vocabularyCache = 'vocabulary_cache';
+  static const String studyHistory = 'study_history';
+  static const String offlineData = 'offline_data';
+  static const String themeMode = 'theme_mode';
+  static const String language = 'language';
+  static const String firstLaunch = 'first_launch';
+  static const String onboardingCompleted = 'onboarding_completed';
+}