鸿蒙Flutter分布式状态管理实战指南
概述
在鸿蒙全场景生态中，应用状态需要在多设备间保持一致。本文讲解如何基于Provider状态管理库与鸿蒙分布式数据服务，构建一套完整的跨设备状态同步方案。
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分布式状态管理架构
核心设计理念
┌─────────────────────────────────────────────────────────┐
│ Flutter UI层 │
│ Consumer/Selector │
└────────────────────┬────────────────────────────────┘
│ 状态变更通知
┌────────────────────┴────────────────────────────────┐
│ Provider状态管理层 │
│ ChangeNotifier + 状态序列化/反序列化 │
└────────────────────┬────────────────────────────────┘
│ 同步触发
┌────────────────────┴────────────────────────────────┐
│ 分布式数据同步层 (DistributedSync) │
│ 防抖/批量/冲突解决 │
└────────────────────┬────────────────────────────────┘
│ 跨设备传输
┌────────────────────┴────────────────────────────────┐
│ 鸿蒙分布式数据服务 │
│ 分布式KV/数据对象/分布式文件 │
└─────────────────────────────────────────────────────┘技术选型
| 层级 | 技术方案 | 说明 |
|---|---|---|
| UI层 | Provider + Selector | 响应式UI更新 |
| 状态层 | ChangeNotifier | 可观察状态 |
| 序列化 | json_serializable | 类型安全的数据转换 |
| 同步层 | 分布式数据管理器 | 防抖、批量、冲突解决 |
| 存储层 | 鸿蒙分布式KV | 跨设备数据持久化 |
核心状态模型设计
可序列化状态基类
dart
/// 分布式状态基类
abstract class DistributedState {
/// 序列化为JSON
Map<String, dynamic> toJson();
/// 从JSON反序列化
static T fromJson<T extends DistributedState>(
Map<String, dynamic> json,
T Function(Map<String, dynamic>) constructor,
) {
return constructor(json);
}
/// 获取状态唯一标识
String get stateId;
/// 获取状态版本号（用于冲突解决）
int get version;
/// 创建状态副本
DistributedState copyWith(Map<String, dynamic> updates);
}
/// 用户状态模型
@JsonSerializable()
class UserState extends DistributedState {
final String userId;
final String userName;
final String avatar;
final int themeMode; // 0: light, 1: dark, 2: auto
final Map<String, dynamic> preferences;
final int version;
const UserState({
required this.userId,
required this.userName,
this.avatar = '',
this.themeMode = 0,
this.preferences = const {},
this.version = 0,
});
@override
String get stateId => 'user_$userId';
@override
Map<String, dynamic> toJson() => _$UserStateToJson(this);
factory UserState.fromJson(Map<String, dynamic> json) =>
_$UserStateFromJson(json);
@override
UserState copyWith(Map<String, dynamic> updates) {
return UserState(
userId: updates['userId'] as String? ?? userId,
userName: updates['userName'] as String? ?? userName,
avatar: updates['avatar'] as String? ?? avatar,
themeMode: updates['themeMode'] as int? ?? themeMode,
preferences: updates['preferences'] as Map<String, dynamic>? ?? preferences,
version: (updates['version'] as int? ?? version) + 1,
);
}
UserState copyWithPreferences(Map<String, dynamic> newPrefs) {
return copyWith({'preferences': {...preferences, ...newPrefs}});
}
}
/// 应用状态模型
@JsonSerializable()
class AppState extends DistributedState {
final String appId;
final UserState? currentUser;
final List<String> recentDevices;
final Map<String, dynamic> cache;
final int version;
const AppState({
required this.appId,
this.currentUser,
this.recentDevices = const [],
this.cache = const {},
this.version = 0,
});
@override
String get stateId => 'app_$appId';
@override
Map<String, dynamic> toJson() => _$AppStateToJson(this);
factory AppState.fromJson(Map<String, dynamic> json) =>
_$AppStateFromJson(json);
@override
AppState copyWith(Map<String, dynamic> updates) {
return AppState(
appId: updates['appId'] as String? ?? appId,
currentUser: updates['currentUser'] as UserState?,
recentDevices: updates['recentDevices'] as List<String>? ?? recentDevices,
cache: updates['cache'] as Map<String, dynamic>? ?? cache,
version: (updates['version'] as int? ?? version) + 1,
);
}
}分布式状态管理器
核心同步管理器
dart
/// 分布式状态同步管理器
class DistributedStateManager {
static const MethodChannel _channel =
MethodChannel('distributed_state_channel');
static final DistributedStateManager _instance =
DistributedStateManager._internal();
factory DistributedStateManager() => _instance;
DistributedStateManager._internal();
// 状态缓存
final Map<String, DistributedState> _stateCache = {};
// 同步控制器
final Map<String, SyncController> _syncControllers = {};
/// 注册状态
void registerState(DistributedState state) {
_stateCache[state.stateId] = state;
_syncControllers[state.stateId] = SyncController(state.stateId);
}
/// 更新状态并同步
Future<void> updateState<T extends DistributedState>(
T newState, {
SyncMode syncMode = SyncMode.immediate,
}) async {
final stateId = newState.stateId;
// 更新本地缓存
_stateCache[stateId] = newState;
// 执行同步
final controller = _syncControllers[stateId];
if (controller != null) {
await controller.sync(newState, syncMode);
}
}
/// 监听远程状态变更
void listenRemoteStates(RemoteStateCallback callback) {
_channel.setMethodCallHandler((call) async {
if (call.method == 'onRemoteStateChange') {
final args = call.arguments as Map<String, dynamic>;
final stateId = args['stateId'] as String;
final stateJson = args['state'] as Map<String, dynamic>;
final state = _parseRemoteState(stateId, stateJson);
if (state != null) {
callback(stateId, state);
}
}
return null;
});
}
/// 获取本地状态
T? getState<T extends DistributedState>(String stateId) {
return _stateCache[stateId] as T?;
}
DistributedState? _parseRemoteState(String stateId, Map<String, dynamic> json) {
// 根据stateId解析对应的状态类型
if (stateId.startsWith('user_')) {
return UserState.fromJson(json);
} else if (stateId.startsWith('app_')) {
return AppState.fromJson(json);
}
return null;
}
}
/// 同步模式
enum SyncMode {
/// 立即同步
immediate,
/// 防抖同步（默认500ms）
debounced,
/// 批量同步
batched,
}
/// 同步控制器
class SyncController {
final String stateId;
Timer? _syncTimer;
final List<DistributedState> _batchBuffer = [];
SyncController(this.stateId);
/// 执行同步
Future<void> sync(
DistributedState state,
SyncMode mode,
) async {
switch (mode) {
case SyncMode.immediate:
await _immediateSync(state);
break;
case SyncMode.debounced:
_debouncedSync(state);
break;
case SyncMode.batched:
_batchedSync(state);
break;
}
}
Future<void> _immediateSync(DistributedState state) async {
try {
await DistributedStateManager._channel.invokeMethod('syncState', {
'stateId': state.stateId,
'state': state.toJson(),
'version': state.version,
});
} catch (e) {
debugPrint('同步状态失败 [$stateId]: $e');
}
}
void _debouncedSync(DistributedState state) {
_syncTimer?.cancel();
_syncTimer = Timer(const Duration(milliseconds: 500), () {
_immediateSync(state);
});
}
void _batchedSync(DistributedState state) {
_batchBuffer.add(state);
_syncTimer?.cancel();
_syncTimer = Timer(const Duration(seconds: 2), () {
_flushBatch();
});
}
Future<void> _flushBatch() async {
if (_batchBuffer.isEmpty) return;
final batch = List<Map<String, dynamic>>.from(
_batchBuffer.map((s) => {
'stateId': s.stateId,
'state': s.toJson(),
'version': s.version,
}),
);
_batchBuffer.clear();
try {
await DistributedStateManager._channel.invokeMethod('syncBatch', {
'states': batch,
});
} catch (e) {
debugPrint('批量同步失败: $e');
}
}
}
typedef RemoteStateCallback = void Function(
String stateId,
DistributedState state,
);Provider状态管理集成
分布式状态Provider
dart
/// 用户状态Provider
class UserStateProvider extends ChangeNotifier {
final DistributedStateManager _stateManager;
UserState? _currentUser;
UserState? get currentUser => _currentUser;
bool get isLoggedIn => _currentUser != null;
UserStateProvider(this._stateManager) {
_initialize();
}
void _initialize() {
// 监听远程状态变更
_stateManager.listenRemoteStates((stateId, state) {
if (stateId.startsWith('user_') && state is UserState) {
_currentUser = state;
notifyListeners();
}
});
}
/// 登录
Future<void> login({
required String userId,
required String userName,
}) async {
_currentUser = UserState(
userId: userId,
userName: userName,
);
// 注册并同步状态
_stateManager.registerState(_currentUser!);
await _stateManager.updateState(_currentUser!);
notifyListeners();
}
/// 登出
Future<void> logout() async {
if (_currentUser == null) return;
// 清除状态
_currentUser = null;
notifyListeners();
}
/// 更新主题模式
Future<void> updateThemeMode(int themeMode) async {
if (_currentUser == null) return;
_currentUser = _currentUser!.copyWith({'themeMode': themeMode});
await _stateManager.updateState(
_currentUser!,
syncMode: SyncMode.debounced,
);
notifyListeners();
}
/// 更新用户偏好
Future<void> updatePreferences(Map<String, dynamic> preferences) async {
if (_currentUser == null) return;
_currentUser = _currentUser!.copyWithPreferences(preferences);
await _stateManager.updateState(
_currentUser!,
syncMode: SyncMode.debounced,
);
notifyListeners();
}
}
/// 应用状态Provider
class AppStateProvider extends ChangeNotifier {
final DistributedStateManager _stateManager;
AppState _appState;
AppStateProvider(this._stateManager)
: _appState = const AppState(appId: 'default') {
_initialize();
}
AppState get appState => _appState;
void _initialize() {
_stateManager.registerState(_appState);
_stateManager.listenRemoteStates((stateId, state) {
if (stateId.startsWith('app_') && state is AppState) {
_appState = state;
notifyListeners();
}
});
}
/// 添加最近使用设备
Future<void> addRecentDevice(String deviceId) async {
final devices = [_deviceId, ..._appState.recentDevices];
final uniqueDevices = devices.toSet().toList();
_appState = _appState.copyWith({
'recentDevices': uniqueDevices.take(10).toList(),
});
await _stateManager.updateState(_appState);
notifyListeners();
}
/// 更新缓存
Future<void> updateCache(String key, dynamic value) async {
final newCache = Map<String, dynamic>.from(_appState.cache);
newCache[key] = value;
_appState = _appState.copyWith({'cache': newCache});
await _stateManager.updateState(
_appState,
syncMode: SyncMode.batched,
);
notifyListeners();
}
}鸿蒙端实现
分布式数据管理器
typescript
// DistributedDataManager.ets
import distributedData from '@ohos.data.distributedData';
import { MethodChannel } from '@ohos.flutter';
export class DistributedDataManager {
private kvManager: distributedData.KvManager | null = null;
private kvStore: distributedData.SingleKvStore | null = null;
private flutterChannel: MethodChannel | null = null;
async initialize(context: Context, channel: MethodChannel): Promise<void> {
this.flutterChannel = channel;
// 创建KV管理器
const config: distributedData.KvManagerConfig = {
context: context,
bundleName: 'com.example.distributed_app'
};
this.kvManager = await distributedData.createKvManager(config);
// 获取KVStore
const storeConfig: distributedData.SingleKvStoreConfig = {
storeId: 'distributed_state_store',
securityLevel: distributedData.SecurityLevel.S1
};
this.kvStore = await this.kvManager.getSingleKvStore(storeConfig);
// 监听数据变更
this._setupDataChangeListener();
// 注册Flutter通信
this._registerMethodChannel();
}
private _setupDataChangeListener(): void {
this.kvStore?.on('dataChange', distributedData.SubscribeType.SUBSCRIBE_TYPE_ALL,
(data) => {
// 通知Flutter状态变更
this._notifyFlutterStateChange(data);
}
);
}
private _notifyFlutterStateChange(data: distributedData.ChangeNotification): void {
if (this.flutterChannel) {
data.entries?.forEach(async (entry) => {
const stateId = entry.key.toString();
const stateJson = JSON.parse(entry.value.toString());
this.flutterChannel?.invokeMethod('onRemoteStateChange', {
'stateId': stateId,
'state': stateJson
});
});
}
}
private _registerMethodChannel(): void {
this.flutterChannel?.setMethodCallHandler(async (method: string, args: Record<string, Object>): Promise<Object> => {
switch (method) {
case 'syncState':
return await this._syncState(args);
case 'syncBatch':
return await this._syncBatch(args);
case 'getState':
return await this._getState(args);
default:
return null;
}
});
}
private async _syncState(args: Record<string, Object>): Promise<boolean> {
try {
const stateId = args['stateId'] as string;
const state = args['state'] as Record<string, Object>;
const version = args['version'] as number;
// 检查版本冲突
const current = await this.kvStore?.get(stateId);
if (current) {
const currentJson = JSON.parse(current.toString());
if (currentJson['version'] >= version) {
console.info('状态版本冲突，忽略旧版本更新');
return false;
}
}
// 保存状态
await this.kvStore?.put(stateId, JSON.stringify(state));
return true;
} catch (e) {
console.error('同步状态失败:', e);
return false;
}
}
private async _syncBatch(args: Record<string, Object>): Promise<boolean> {
try {
const states = args['states'] as Record<string, Object>[];
for (const stateData of states) {
await this._syncState(stateData);
}
return true;
} catch (e) {
console.error('批量同步失败:', e);
return false;
}
}
private async _getState(args: Record<string, Object>): Promise<Record<string, Object> | null> {
try {
const stateId = args['stateId'] as string;
const value = await this.kvStore?.get(stateId);
if (value) {
return JSON.parse(value.toString());
}
return null;
} catch (e) {
console.error('获取状态失败:', e);
return null;
}
}
async destroy(): Promise<void> {
await this.kvManager?.close();
this.kvManager = null;
this.kvStore = null;
this.flutterChannel = null;
}
}UI集成示例
应用入口配置
dart
void main() async {
WidgetsFlutterBinding.ensureInitialized();
// 初始化分布式状态管理
final stateManager = DistributedStateManager();
runApp(
MultiProvider(
providers: [
ChangeNotifierProvider(
create: (_) => UserStateProvider(stateManager),
),
ChangeNotifierProvider(
create: (_) => AppStateProvider(stateManager),
),
Provider(
create: (_) => stateManager,
),
],
child: const DistributedApp(),
),
);
}
class DistributedApp extends StatelessWidget {
const DistributedApp({super.key});
@override
Widget build(BuildContext context) {
final userState = context.watch<UserStateProvider>();
return MaterialApp(
title: '分布式状态管理',
theme: _getTheme(userState.currentUser?.themeMode ?? 0),
home: const HomePage(),
debugShowCheckedModeBanner: false,
);
}
ThemeData _getTheme(int mode) {
switch (mode) {
case 1:
return ThemeData.dark(useMaterial3: true);
case 2:
return ThemeData(
colorScheme: ColorScheme.fromSeed(
seedColor: Colors.blue,
brightness: MediaQueryData.fromWindow(WidgetsBinding.instance.window)
.platformBrightness ??
Brightness.light,
),
useMaterial3: true,
);
default:
return ThemeData.light(useMaterial3: true);
}
}
}响应式UI组件
dart
/// 用户设置页面
class UserSettingsPage extends ConsumerWidget {
const UserSettingsPage({super.key});
@override
Widget build(BuildContext context, WidgetRef ref) {
final userState = ref.watch(userStateProvider);
if (!userState.isLoggedIn) {
return const LoginPage();
}
final user = userState.currentUser!;
return Scaffold(
appBar: AppBar(
title: const Text('用户设置'),
),
body: ListView(
children: [
// 用户信息卡片
_buildUserCard(user),
// 主题设置
_buildThemeSection(context, user, ref),
// 偏好设置
_buildPreferencesSection(context, user, ref),
// 同步状态显示
_buildSyncStatusCard(context),
// 登出按钮
_buildLogoutButton(context, ref),
],
),
);
}
Widget _buildUserCard(UserState user) {
return Card(
margin: const EdgeInsets.all(16),
child: ListTile(
leading: CircleAvatar(
child: Text(user.userName[0].toUpperCase()),
),
title: Text(user.userName),
subtitle: Text('ID: ${user.userId}'),
trailing: Chip(
label: Text('v${user.version}'),
backgroundColor: Colors.green.shade100,
),
),
);
}
Widget _buildThemeSection(BuildContext context, UserState user, WidgetRef ref) {
return Card(
margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
child: Padding(
padding: const EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text(
'主题设置',
style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
),
const SizedBox(height: 16),
SegmentedButton<int>(
segments: const [
ButtonSegment(
value: 0,
label: Text('浅色'),
icon: Icon(Icons.light_mode),
),
ButtonSegment(
value: 1,
label: Text('深色'),
icon: Icon(Icons.dark_mode),
),
ButtonSegment(
value: 2,
label: Text('自动'),
icon: Icon(Icons.brightness_auto),
),
],
selected: {user.themeMode},
onSelectionChanged: (Set<int> newSelection) {
ref.read(userStateProvider.notifier).updateThemeMode(
newSelection.first,
);
},
),
],
),
),
);
}
Widget _buildPreferencesSection(
BuildContext context,
UserState user,
WidgetRef ref,
) {
return Card(
margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
child: Column(
children: [
const ListTile(
title: Text(
'偏好设置',
style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
),
),
SwitchListTile(
title: const Text('启用通知'),
subtitle: const Text('接收跨设备通知'),
value: user.preferences['notifications'] as bool? ?? true,
onChanged: (bool value) {
ref.read(userStateProvider.notifier).updatePreferences({
'notifications': value,
});
},
),
SwitchListTile(
title: const Text('自动同步'),
subtitle: const Text('自动同步到其他设备'),
value: user.preferences['autoSync'] as bool? ?? true,
onChanged: (bool value) {
ref.read(userStateProvider.notifier).updatePreferences({
'autoSync': value,
});
},
),
],
),
);
}
Widget _buildSyncStatusCard(BuildContext context) {
final appState = ref.watch(appStateProvider);
return Card(
margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
child: ListTile(
leading: const Icon(Icons.sync),
title: const Text('同步状态'),
subtitle: Text(
'已连接 ${appState.recentDevices.length} 台设备',
),
trailing: const Icon(Icons.chevron_right),
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (_) => const SyncDevicesPage(),
),
);
},
),
);
}
Widget _buildLogoutButton(BuildContext context, WidgetRef ref) {
return Padding(
padding: const EdgeInsets.all(16),
child: FilledButton.tonalIcon(
onPressed: () async {
final confirmed = await showDialog<bool>(
context: context,
builder: (_) => AlertDialog(
title: const Text('确认登出'),
content: const Text('确定要登出当前账户吗？'),
actions: [
TextButton(
onPressed: () => Navigator.pop(context, false),
child: const Text('取消'),
),
FilledButton(
onPressed: () => Navigator.pop(context, true),
child: const Text('确认'),
),
],
),
);
if (confirmed == true) {
await ref.read(userStateProvider.notifier).logout();
}
},
icon: const Icon(Icons.logout),
label: const Text('退出登录'),
style: FilledButton.styleFrom(
minimumSize: const Size.fromHeight(48),
),
),
);
}
}
/// 登录页面
class LoginPage extends ConsumerStatefulWidget {
const LoginPage({super.key});
@override
ConsumerState<LoginPage> createState() => _LoginPageState();
}
class _LoginPageState extends ConsumerState<LoginPage> {
final _userIdController = TextEditingController();
final _userNameController = TextEditingController();
bool _isLoading = false;
@override
void dispose() {
_userIdController.dispose();
_userNameController.dispose();
super.dispose();
}
Future<void> _login() async {
if (_userIdController.text.isEmpty || _userNameController.text.isEmpty) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('请输入用户信息')),
);
return;
}
setState(() => _isLoading = true);
await ref.read(userStateProvider.notifier).login(
userId: _userIdController.text,
userName: _userNameController.text,
);
setState(() => _isLoading = false);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Padding(
padding: const EdgeInsets.all(24),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
const Icon(
Icons.cloud_sync,
size: 80,
color: Colors.blue,
),
const SizedBox(height: 48),
const Text(
'分布式状态管理',
style: TextStyle(
fontSize: 24,
fontWeight: FontWeight.bold,
),
),
const SizedBox(height: 48),
TextField(
controller: _userIdController,
decoration: const InputDecoration(
labelText: '用户ID',
border: OutlineInputBorder(),
),
),
const SizedBox(height: 16),
TextField(
controller: _userNameController,
decoration: const InputDecoration(
labelText: '用户名',
border: OutlineInputBorder(),
),
),
const SizedBox(height: 24),
FilledButton(
onPressed: _isLoading ? null : _login,
style: FilledButton.styleFrom(
minimumSize: const Size.fromHeight(48),
),
child: _isLoading
? const SizedBox(
height: 20,
width: 20,
child: CircularProgressIndicator(strokeWidth: 2),
)
: const Text('登录'),
),
],
),
),
),
);
}
}冲突解决策略
版本号冲突检测
dart
/// 冲突解决策略
enum ConflictResolution {
/// 使用最新版本
useLatest,
/// 使用本地版本
useLocal,
/// 使用远程版本
useRemote,
/// 手动合并
manualMerge,
}
/// 状态合并器
class StateMerger {
/// 合并两个状态
static DistributedState merge(
DistributedState local,
DistributedState remote, {
ConflictResolution strategy = ConflictResolution.useLatest,
}) {
switch (strategy) {
case ConflictResolution.useLatest:
return local.version >= remote.version ? local : remote;
case ConflictResolution.useLocal:
return local;
case ConflictResolution.useRemote:
return remote;
case ConflictResolution.manualMerge:
return _manualMerge(local, remote);
}
}
static DistributedState _manualMerge(
DistributedState local,
DistributedState remote,
) {
// 根据状态类型实现自定义合并逻辑
if (local is UserState && remote is UserState) {
return _mergeUserState(local, remote);
}
return local.version >= remote.version ? local : remote;
}
static UserState _mergeUserState(UserState local, UserState remote) {
// 合并偏好设置
final mergedPrefs = Map<String, dynamic>.from(local.preferences);
for (final entry in remote.preferences.entries) {
// 使用更新时间戳判断（假设preferences中有时间戳）
final localTime = mergedPrefs['${entry.key}_timestamp'] as int? ?? 0;
final remoteTime = remote.preferences['${entry.key}_timestamp'] as int? ?? 0;
if (remoteTime > localTime) {
mergedPrefs[entry.key] = entry.value;
mergedPrefs['${entry.key}_timestamp'] = remoteTime;
}
}
return UserState(
userId: local.userId,
userName: remote.version > local.version ? remote.userName : local.userName,
avatar: remote.version > local.version ? remote.avatar : local.avatar,
themeMode: remote.version > local.version ? remote.themeMode : local.themeMode,
preferences: mergedPrefs,
version: max(local.version, remote.version) + 1,
);
}
}性能优化
状态缓存策略
dart
/// 状态缓存管理器
class StateCacheManager {
final Map<String, _CacheEntry> _cache = {};
final Duration _cacheTimeout;
final int _maxCacheSize;
StateCacheManager({
Duration cacheTimeout = const Duration(minutes: 5),
int maxCacheSize = 100,
}) : _cacheTimeout = cacheTimeout,
_maxCacheSize = maxCacheSize;
/// 获取缓存状态
DistributedState? get(String stateId) {
final entry = _cache[stateId];
if (entry == null) return null;
if (DateTime.now().difference(entry.timestamp) > _cacheTimeout) {
_cache.remove(stateId);
return null;
}
return entry.state;
}
/// 设置缓存
void set(DistributedState state) {
_cache[state.stateId] = _CacheEntry(
state: state,
timestamp: DateTime.now(),
);
// 清理过期缓存
_cleanup();
}
/// 清理缓存
void _cleanup() {
if (_cache.length <= _maxCacheSize) return;
final entries = _cache.entries.toList()
..sort((a, b) => a.value.timestamp.compareTo(b.value.timestamp));
final removeCount = _cache.length - _maxCacheSize;
for (var i = 0; i < removeCount; i++) {
_cache.remove(entries[i].key);
}
}
/// 清空所有缓存
void clear() {
_cache.clear();
}
}
class _CacheEntry {
final DistributedState state;
final DateTime timestamp;
_CacheEntry({required this.state, required this.timestamp});
}总结
本文介绍了鸿蒙Flutter分布式状态管理的完整方案：
- 架构设计：四层分离的状态管理架构
- 状态模型：可序列化的分布式状态基类
- 同步机制：支持立即、防抖、批量三种同步模式
- Provider集成：与Flutter生态无缝集成
- 冲突解决：版本号检测与自定义合并策略
- 性能优化：状态缓存与批量处理
通过这套方案，开发者可以轻松实现跨设备的状态一致性，为全场景应用提供可靠的状态管理能力。
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