一、HarmonyOS PC：重新定义桌面计算体验

在HarmonyOS 5.0时代，PC不再仅仅是独立的生产力工具，而是成为鸿蒙生态中分布式超级终端的核心节点。HarmonyOS PC应用开发与传统Windows或macOS开发有着本质区别——它天生具备跨设备协同、无缝流转、统一生态三大核心优势。

1.1 HarmonyOS PC的技术架构革新

HarmonyOS PC采用微内核分布式架构，实现了硬件能力虚拟化、资源池化、服务化。这一架构带来四大技术突破：

分布式软总线技术：让PC与手机、平板、智慧屏等设备实现毫秒级低时延连接，延迟低于20ms，传输速率高达1.2Gbps，支持8K视频的无损流转。

分布式数据管理：通过统一的分布式数据库，实现跨设备数据同步，用户在一台设备上创建的文件，可在所有设备上实时访问，数据同步延迟小于100ms。

分布式安全框架：基于硬件级安全芯片和可信执行环境，构建从芯片到云端的全链路安全防护，确保跨设备数据流转的安全性。

自适应UI框架：一套代码自动适配从手机到PC的不同屏幕尺寸和交互方式，开发者无需为不同设备单独开发应用。

1.2 PC应用开发现状与机遇

截至2025年底，HarmonyOS PC设备出货量突破500万台，覆盖轻薄本、游戏本、工作站等多种形态。华为应用市场PC专区已上架超过3000款原生HarmonyOS应用，涵盖办公、设计、开发、娱乐等全场景。

与传统PC应用相比，HarmonyOS PC应用具有显著优势：

• 安装包体积减少60%：平均安装包大小从传统的200MB降至80MB

• 启动速度提升70%：冷启动时间从3秒缩短至1秒以内

• 内存占用降低50%：相同功能下内存占用减少一半

• 跨设备协同零成本：原生支持与手机、平板等设备协同工作

二、开发环境搭建：专业级PC应用开发配置

2.1 硬件与软件要求

硬件要求：

• 开发机：Windows 10/11 64位或macOS 11.0+

• 内存：16GB RAM（推荐32GB）

• 存储：100GB可用空间（用于SDK和模拟器）

• 处理器：Intel Core i5 8代或同等性能的AMD处理器

软件要求：

• DevEco Studio 5.0.1.300及以上版本

• HarmonyOS SDK 10.0.0.100及以上

• Node.js 18.0.0+（用于ArkTS编译）

• Git 2.30.0+（版本控制）

2.2 安装与配置DevEco Studio

1. 下载安装包：从华为开发者联盟官网下载DevEco Studio for PC版本

2. 安装SDK：首次启动时，选择"PC Application"开发套件

3. 配置模拟器：安装PC模拟器镜像，支持多种分辨率配置

4. 设置代理（可选）：如果访问国外资源较慢，可配置镜像加速

# 检查环境配置脚本
#!/bin/bash
echo "=== HarmonyOS PC开发环境检查 ==="

# 检查Java版本
java_version=$(java -version 2>&1 | head -1 | cut -d'"' -f2)
echo "Java版本: $java_version"

# 检查Node.js版本
node_version=$(node --version)
echo "Node.js版本: $node_version"

# 检查HarmonyOS SDK
if [ -d "$HOME/HarmonyOSSDK" ]; then
    sdk_version=$(cat "$HOME/HarmonyOSSDK/version.txt")
    echo "HarmonyOS SDK版本: $sdk_version"
else
    echo "警告: HarmonyOS SDK未安装"
fi

# 检查模拟器状态
emulator_status=$(ps aux | grep -i "hdc" | grep -v grep)
if [ -n "$emulator_status" ]; then
    echo "模拟器状态: 运行中"
else
    echo "模拟器状态: 未运行"
fi

2.3 创建第一个PC应用项目

在DevEco Studio中创建新项目，选择"PC Application"模板：

// 项目结构说明
my-pc-app/
├── entry/                    # 主模块
│   ├── src/main/
│   │   ├── ets/             # ArkTS代码
│   │   │   ├── MainAbility/ # 主能力
│   │   │   ├── pages/       # 页面组件
│   │   │   └── utils/       # 工具类
│   │   ├── resources/       # 资源文件
│   │   └── module.json5     # 模块配置
├── build-profile.json5      # 构建配置
├── hvigorfile.ts            # 构建脚本
└── oh-package.json5         # 依赖管理

三、PC应用架构设计：面向大屏的现代化架构

3.1 响应式布局系统

PC应用需要适配从13英寸到32英寸的不同屏幕尺寸，HarmonyOS提供完整的响应式布局解决方案：

// ResponsiveLayout.ets - 响应式布局组件
@Component
struct ResponsiveLayout {
  @State currentBreakpoint: Breakpoint = 'desktop';
  
  // 监听窗口尺寸变化
  aboutToAppear() {
    window.on('windowSizeChange', (size: window.Size) => {
      this.updateBreakpoint(size.width);
    });
  }
  
  private updateBreakpoint(width: number): void {
    if (width < 768) {
      this.currentBreakpoint = 'mobile';
    } else if (width < 1024) {
      this.currentBreakpoint = 'tablet';
    } else if (width < 1440) {
      this.currentBreakpoint = 'desktop';
    } else {
      this.currentBreakpoint = 'largeDesktop';
    }
  }
  
  build() {
    // 根据断点显示不同布局
    Column() {
      if (this.currentBreakpoint === 'mobile') {
        this.buildMobileLayout();
      } else if (this.currentBreakpoint === 'tablet') {
        this.buildTabletLayout();
      } else if (this.currentBreakpoint === 'desktop') {
        this.buildDesktopLayout();
      } else {
        this.buildLargeDesktopLayout();
      }
    }
  }
  
  @Builder
  private buildDesktopLayout(): any {
    Row() {
      // 侧边栏 - 固定宽度
      NavigationSidebar({
        width: 240,
        items: this.navigationItems
      })
      
      // 主内容区 - 自适应
      Column() {
        // 顶部工具栏
        DesktopToolbar({
          height: 60,
          showSearch: true,
          showUserMenu: true
        })
        
        // 内容区域
        Scroll() {
          Grid() {
            GridItem() {
              FileBrowser({ span: 8 })
            }
            GridItem() {
              PreviewPanel({ span: 4 })
            }
          }
          .columnsTemplate('1fr 1fr')
          .rowsTemplate('1fr')
          .height('100%')
        }
      }
      .layoutWeight(1)
    }
    .height('100%')
  }
}

3.2 多窗口管理系统

PC应用的核心特性之一是支持多窗口操作，HarmonyOS提供完整的窗口管理API：

// WindowManager.ets - 窗口管理
import window from '@ohos.window';

class WindowManager {
  private mainWindow: window.Window | null = null;
  private floatingWindows: Map<string, window.Window> = new Map();
  
  // 创建主窗口
  async createMainWindow(context: Context, config: WindowConfig): Promise<void> {
    this.mainWindow = await window.create(context, {
      windowName: 'main',
      windowType: window.WindowType.TYPE_APP,
      ctx: context
    });
    
    // 设置窗口属性
    await this.mainWindow.setWindowProperties({
      width: config.width,
      height: config.height,
      minWidth: config.minWidth,
      minHeight: config.minHeight,
      maximizable: true,
      minimizable: true,
      resizable: true
    });
    
    // 设置窗口位置
    await this.mainWindow.moveTo(config.x, config.y);
    
    // 监听窗口事件
    this.setupWindowListeners(this.mainWindow);
  }
  
  // 创建浮动窗口
  async createFloatingWindow(
    context: Context, 
    name: string, 
    content: Component
  ): Promise<void> {
    const floatingWindow = await window.create(context, {
      windowName: name,
      windowType: window.WindowType.TYPE_FLOAT,
      ctx: context
    });
    
    // 浮动窗口属性
    await floatingWindow.setWindowProperties({
      width: 400,
      height: 300,
      focusable: true,
      touchable: true,
      dismissOnTouchOutside: false
    });
    
    // 设置内容
    await floatingWindow.setUIContent(content);
    
    // 添加到管理
    this.floatingWindows.set(name, floatingWindow);
    
    // 设置拖拽行为
    this.setupDragBehavior(floatingWindow);
  }
  
  // 窗口平铺布局
  async arrangeWindowsTiled(layout: TiledLayout): Promise<void> {
    const screenWidth = await this.getScreenWidth();
    const screenHeight = await this.getScreenHeight();
    
    // 计算每个窗口的位置和大小
    const windows = Array.from(this.floatingWindows.values());
    
    windows.forEach((win, index) => {
      const position = this.calculateTilePosition(
        index, 
        windows.length, 
        screenWidth, 
        screenHeight,
        layout
      );
      
      win.resize(position.width, position.height);
      win.moveTo(position.x, position.y);
    });
  }
  
  // 窗口级联布局
  async arrangeWindowsCascaded(): Promise<void> {
    const cascadeOffset = 30; // 级联偏移量
    
    let currentX = 50;
    let currentY = 50;
    
    for (const [name, win] of this.floatingWindows) {
      await win.moveTo(currentX, currentY);
      await win.resize(800, 600);
      
      // 下一个窗口偏移
      currentX += cascadeOffset;
      currentY += cascadeOffset;
      
      // 确保不超出屏幕
      const screenWidth = await this.getScreenWidth();
      const screenHeight = await this.getScreenHeight();
      
      if (currentX + 800 > screenWidth) {
        currentX = 50;
      }
      if (currentY + 600 > screenHeight) {
        currentY = 50;
      }
    }
  }
  
  private setupDragBehavior(win: window.Window): void {
    // 获取窗口的拖拽区域
    const dragArea = win.getComponentById('window-header');
    
    if (dragArea) {
      dragArea.on('touchstart', (event) => {
        this.startDragging(win, event);
      });
      
      dragArea.on('touchmove', (event) => {
        this.handleDragging(win, event);
      });
      
      dragArea.on('touchend', () => {
        this.stopDragging(win);
      });
    }
  }
}

四、PC专属特性开发

4.1 系统托盘集成

PC应用通常需要在系统托盘中运行，HarmonyOS提供完整的系统托盘API：

// SystemTrayManager.ets - 系统托盘管理
import systemTray from '@ohos.systemTray';
import notification from '@ohos.notification';

class SystemTrayManager {
  private trayItem: systemTray.TrayItem | null = null;
  private menuItems: systemTray.MenuItem[] = [];
  
  async setupSystemTray(context: Context): Promise<void> {
    // 创建托盘图标
    this.trayItem = await systemTray.createTrayItem(context, {
      icon: $r('app.media.tray_icon'),
      tooltip: '我的PC应用'
    });
    
    // 设置托盘菜单
    this.menuItems = [
      {
        id: 'show_window',
        text: '显示主窗口',
        icon: $r('app.media.show_icon'),
        action: () => this.showMainWindow()
      },
      {
        id: 'settings',
        text: '设置',
        icon: $r('app.media.settings_icon'),
        action: () => this.openSettings()
      },
      { type: 'separator' },
      {
        id: 'quit',
        text: '退出',
        icon: $r('app.media.quit_icon'),
        action: () => this.quitApplication()
      }
    ];
    
    await this.trayItem.setMenu(this.menuItems);
    
    // 监听托盘事件
    this.trayItem.on('click', () => {
      this.onTrayClick();
    });
    
    this.trayItem.on('rightClick', () => {
      this.onTrayRightClick();
    });
  }
  
  // 显示托盘通知
  async showTrayNotification(title: string, content: string): Promise<void> {
    if (!this.trayItem) return;
    
    await this.trayItem.showNotification({
      title,
      content,
      icon: $r('app.media.notification_icon'),
      actions: [
        {
          text: '查看',
          action: () => this.onNotificationAction('view')
        },
        {
          text: '忽略',
          action: () => this.onNotificationAction('dismiss')
        }
      ]
    });
  }
  
  // 更新托盘图标状态
  async updateTrayStatus(status: 'normal' | 'warning' | 'error'): Promise<void> {
    if (!this.trayItem) return;
    
    let iconResource: Resource;
    switch (status) {
      case 'warning':
        iconResource = $r('app.media.tray_warning');
        break;
      case 'error':
        iconResource = $r('app.media.tray_error');
        break;
      default:
        iconResource = $r('app.media.tray_icon');
    }
    
    await this.trayItem.updateIcon(iconResource);
  }
}

4.2 全局快捷键支持

PC用户习惯使用快捷键提高效率，HarmonyOS提供全局快捷键注册能力：

// GlobalShortcutManager.ets - 全局快捷键管理
import inputDevice from '@ohos.inputDevice';
import { hilog } from '@kit.PerformanceAnalysisKit';

class GlobalShortcutManager {
  private registeredShortcuts: Map<string, ShortcutConfig> = new Map();
  private isListening: boolean = false;
  
  // 注册全局快捷键
  registerShortcut(id: string, config: ShortcutConfig): boolean {
    if (this.registeredShortcuts.has(id)) {
      hilog.warn(0x0000, 'Shortcut', `快捷键 ${id} 已注册`);
      return false;
    }
    
    // 验证快捷键组合
    if (!this.validateShortcut(config)) {
      hilog.error(0x0000, 'Shortcut', `无效的快捷键组合: ${config.key}`);
      return false;
    }
    
    this.registeredShortcuts.set(id, config);
    
    // 如果尚未开始监听，启动监听
    if (!this.isListening) {
      this.startListening();
    }
    
    hilog.info(0x0000, 'Shortcut', `注册快捷键: ${id} -> ${config.key}`);
    return true;
  }
  
  // 开始监听键盘事件
  private startListening(): void {
    inputDevice.on('keyDown', (event) => {
      this.handleKeyDown(event);
    });
    
    inputDevice.on('keyUp', (event) => {
      this.handleKeyUp(event);
    });
    
    this.isListening = true;
    hilog.info(0x0000, 'Shortcut', '开始监听全局快捷键');
  }
  
  private handleKeyDown(event: KeyEvent): void {
    // 构建当前按键组合
    const currentCombo = this.buildKeyCombo(event);
    
    // 检查是否匹配已注册的快捷键
    for (const [id, config] of this.registeredShortcuts) {
      if (this.matchShortcut(currentCombo, config)) {
        // 执行对应的动作
        config.action();
        
        // 阻止事件继续传播
        event.preventDefault();
        event.stopPropagation();
        
        hilog.debug(0x0000, 'Shortcut', `触发快捷键: ${id}`);
        break;
      }
    }
  }
  
  private buildKeyCombo(event: KeyEvent): KeyCombo {
    const combo: KeyCombo = {
      keyCode: event.keyCode,
      ctrlKey: event.ctrlKey,
      shiftKey: event.shiftKey,
      altKey: event.altKey,
      metaKey: event.metaKey
    };
    
    return combo;
  }
  
  private matchShortcut(combo: KeyCombo, config: ShortcutConfig): boolean {
    // 解析配置中的快捷键字符串
    const configCombo = this.parseShortcutString(config.key);
    
    return (
      combo.keyCode === configCombo.keyCode &&
      combo.ctrlKey === configCombo.ctrlKey &&
      combo.shiftKey === configCombo.shiftKey &&
      combo.altKey === configCombo.altKey &&
      combo.metaKey === configCombo.metaKey
    );
  }
  
  // 解析快捷键字符串，如 "Ctrl+Shift+S"
  private parseShortcutString(shortcutStr: string): ParsedShortcut {
    const parts = shortcutStr.split('+');
    const parsed: ParsedShortcut = {
      keyCode: 0,
      ctrlKey: false,
      shiftKey: false,
      altKey: false,
      metaKey: false
    };
    
    for (const part of parts) {
      const normalized = part.trim().toLowerCase();
      
      switch (normalized) {
        case 'ctrl':
          parsed.ctrlKey = true;
          break;
        case 'shift':
          parsed.shiftKey = true;
          break;
        case 'alt':
          parsed.altKey = true;
          break;
        case 'cmd':
        case 'meta':
          parsed.metaKey = true;
          break;
        default:
          // 尝试解析为具体按键
          const keyCode = this.getKeyCode(normalized);
          if (keyCode > 0) {
            parsed.keyCode = keyCode;
          }
      }
    }
    
    return parsed;
  }
  
  // 预定义常用快捷键
  setupDefaultShortcuts(): void {
    this.registerShortcut('new_file', {
      key: 'Ctrl+N',
      description: '新建文件',
      action: () => this.onCreateNewFile()
    });
    
    this.registerShortcut('save_file', {
      key: 'Ctrl+S',
      description: '保存文件',
      action: () => this.onSaveFile()
    });
    
    this.registerShortcut('save_all', {
      key: 'Ctrl+Shift+S',
      description: '保存所有文件',
      action: () => this.onSaveAllFiles()
    });
    
    this.registerShortcut('find', {
      key: 'Ctrl+F',
      description: '查找',
      action: () => this.onFind()
    });
    
    this.registerShortcut('replace', {
      key: 'Ctrl+H',
      description: '替换',
      action: () => this.onReplace()
    });
    
    this.registerShortcut('toggle_sidebar', {
      key: 'Ctrl+B',
      description: '切换侧边栏',
      action: () => this.onToggleSidebar()
    });
  }
}

4.3 文件系统深度集成

PC应用需要深度集成文件系统，HarmonyOS提供安全的文件访问API：

// FileSystemManager.ets - 文件系统管理
import fileio from '@ohos.fileio';
import fileuri from '@ohos.fileuri';
import { BusinessError } from '@ohos.base';

class FileSystemManager {
  private recentFiles: RecentFile[] = [];
  private fileWatchers: Map<string, fileio.FileWatcher> = new Map();
  
  // 打开文件选择对话框
  async openFileDialog(options: OpenFileOptions): Promise<SelectedFile[]> {
    const result = await fileuri.openFilePicker({
      multiple: options.multiple,
      filters: options.filters,
      startIn: options.startDirectory
    });
    
    if (result.files.length > 0) {
      // 记录到最近文件
      this.addToRecentFiles(result.files);
      
      // 发送文件打开事件
      this.emitFileOpened(result.files);
    }
    
    return result.files;
  }
  
  // 保存文件对话框
  async saveFileDialog(options: SaveFileOptions): Promise<SavedFile> {
    const result = await fileuri.openFileSaver({
      suggestedName: options.suggestedName,
      startIn: options.startDirectory,
      types: options.fileTypes
    });
    
    if (result.file) {
      // 实际保存文件内容
      await this.writeFileContent(result.file, options.content);
      
      // 记录保存操作
      this.recordSaveOperation(result.file);
      
      return result.file;
    }
    
    throw new BusinessError({
      code: 1001,
      message: '用户取消了保存操作'
    });
  }
  
  // 监听文件变化
  async watchFile(filePath: string, callback: FileChangeCallback): Promise<string> {
    const watcher = await fileio.createWatcher(filePath, {
      recursive: false,
      interval: 1000 // 检查间隔1秒
    });
    
    const watchId = `watch_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    watcher.on('change', (event) => {
      callback({
        type: event.type,
        filePath: event.filePath,
        timestamp: Date.now()
      });
    });
    
    this.fileWatchers.set(watchId, watcher);
    
    return watchId;
  }
  
  // 停止监听文件
  stopWatchingFile(watchId: string): void {
    const watcher = this.fileWatchers.get(watchId);
    if (watcher) {
      watcher.stop();
      this.fileWatchers.delete(watchId);
    }
  }
  
  // 文件拖放支持
  setupFileDrop(elementId: string, callback: FileDropCallback): void {
    const element = document.getElementById(elementId);
    if (!element) return;
    
    element.addEventListener('dragover', (event) => {
      event.preventDefault();
      event.dataTransfer.dropEffect = 'copy';
      element.classList.add('drag-over');
    });
    
    element.addEventListener('dragleave', () => {
      element.classList.remove('drag-over');
    });
    
    element.addEventListener('drop', async (event) => {
      event.preventDefault();
      element.classList.remove('drag-over');
      
      const files: DroppedFile[] = [];
      
      if (event.dataTransfer.items) {
        // 使用DataTransferItemList接口
        for (let i = 0; i < event.dataTransfer.items.length; i++) {
          const item = event.dataTransfer.items[i];
          
          if (item.kind === 'file') {
            const file = item.getAsFile();
            if (file) {
              files.push({
                name: file.name,
                path: await this.getFilePath(file),
                size: file.size,
                type: file.type
              });
            }
          }
        }
      } else {
        // 回退到DataTransfer接口
        for (let i = 0; i < event.dataTransfer.files.length; i++) {
          const file = event.dataTransfer.files[i];
          files.push({
            name: file.name,
            path: await this.getFilePath(file),
            size: file.size,
            type: file.type
          });
        }
      }
      
      if (files.length > 0) {
        callback(files);
      }
    });
  }
  
  // 获取最近文件列表
  getRecentFiles(limit: number = 10): RecentFile[] {
    return this.recentFiles
      .sort((a, b) => b.lastAccessed - a.lastAccessed)
      .slice(0, limit);
  }
  
  // 清空最近文件记录
  clearRecentFiles(): void {
    this.recentFiles = [];
    this.saveRecentFilesToStorage();
  }
}

五、跨设备协同开发

5.1 多设备文件同步

HarmonyOS PC应用可以无缝同步文件到其他鸿蒙设备：

// CrossDeviceFileSync.ets - 跨设备文件同步
import distributedFile from '@ohos.distributedFile';
import deviceManager from '@ohos.deviceManager';

class CrossDeviceFileSync {
  private syncSessions: Map<string, SyncSession> = new Map();
  private connectedDevices: ConnectedDevice[] = [];
  
  // 初始化设备发现
  async initializeDeviceDiscovery(): Promise<void> {
    // 监听设备连接状态
    deviceManager.on('deviceOnline', (deviceInfo) => {
      this.onDeviceConnected(deviceInfo);
    });
    
    deviceManager.on('deviceOffline', (deviceInfo) => {
      this.onDeviceDisconnected(deviceInfo);
    });
    
    // 发现附近设备
    await this.discoverNearbyDevices();
  }
  
  // 开始文件同步会话
  async startSyncSession(
    localPath: string, 
    remoteDeviceId: string, 
    remotePath: string
  ): Promise<string> {
    const sessionId = `sync_${Date.now()}`;
    
    // 创建同步会话
    const session = await distributedFile.createSyncSession({
      localPath,
      remoteDeviceId,
      remotePath,
      mode: 'bidirectional', // 双向同步
      conflictResolution: 'newerWins' // 冲突解决策略：新版本胜出
    });
    
    // 监听同步事件
    session.on('progress', (progress) => {
      this.onSyncProgress(sessionId, progress);
    });
    
    session.on('complete', () => {
      this.onSyncComplete(sessionId);
    });
    
    session.on('error', (error) => {
      this.onSyncError(sessionId, error);
    });
    
    // 开始同步
    await session.start();
    
    this.syncSessions.set(sessionId, {
      session,
      status: 'syncing',
      startTime: Date.now()
    });
    
    return sessionId;
  }
  
  // 实时文件同步（类似云盘）
  async setupRealtimeSync(
    folderPath: string, 
    deviceIds: string[]
  ): Promise<void> {
    // 为每个设备创建同步会话
    for (const deviceId of deviceIds) {
      const sessionId = await this.startSyncSession(
        folderPath,
        deviceId,
        folderPath
      );
      
      // 标记为实时同步
      const session = this.syncSessions.get(sessionId);
      if (session) {
        session.isRealtime = true;
      }
    }
    
    // 监听文件夹变化
    const watcher = await fileio.createWatcher(folderPath, {
      recursive: true,
      interval: 500 // 500毫秒检查一次
    });
    
    watcher.on('change', async (event) => {
      // 文件变化时触发同步
      await this.triggerSyncForChange(event.filePath);
    });
  }
  
  // 冲突检测与解决
  private async handleSyncConflict(
    localFile: FileInfo, 
    remoteFile: FileInfo
  ): Promise<ConflictResolution> {
    // 比较文件修改时间
    if (localFile.modifiedTime > remoteFile.modifiedTime) {
      return {
        action: 'useLocal',
        reason: '本地文件更新'
      };
    } else if (remoteFile.modifiedTime > localFile.modifiedTime) {
      return {
        action: 'useRemote',
        reason: '远程文件更新'
      };
    } else {
      // 修改时间相同，比较文件大小
      if (localFile.size > remoteFile.size) {
        return {
          action: 'useLocal',
          reason: '本地文件内容更完整'
        };
      } else {
        return {
          action: 'useRemote',
          reason: '远程文件内容更完整'
        };
      }
    }
  }
  
  // 同步状态监控
  getSyncStatus(sessionId: string): SyncStatus | null {
    const session = this.syncSessions.get(sessionId);
    if (!session) return null;
    
    return {
      sessionId,
      status: session.status,
      progress: session.progress,
      startTime: session.startTime,
      transferredBytes: session.transferredBytes,
      totalBytes: session.totalBytes
    };
  }
  
  // 暂停/恢复同步
  async pauseSync(sessionId: string): Promise<boolean> {
    const session = this.syncSessions.get(sessionId);
    if (!session) return false;
    
    await session.session.pause();
    session.status = 'paused';
    
    return true;
  }
  
  async resumeSync(sessionId: string): Promise<boolean> {
    const session = this.syncSessions.get(sessionId);
    if (!session) return false;
    
    await session.session.resume();
    session.status = 'syncing';
    
    return true;
  }
}

5.2 任务流转与接力

PC上的任务可以无缝流转到手机或平板上继续：

// TaskContinuityManager.ets - 任务连续性管理
import distributedMissionManager from '@ohos.distributedMissionManager';
import continuity from '@ohos.continuity';

class TaskContinuityManager {
  private currentTasks: Map<string, ContinuityTask> = new Map();
  private availableDevices: ContinuityDevice[] = [];
  
  // 注册可流转的任务
  registerContinuityTask(task: ContinuityTask): string {
    const taskId = `task_${Date.now()}`;
    
    this.currentTasks.set(taskId, {
      ...task,
      id: taskId,
      createTime: Date.now(),
      lastUpdateTime: Date.now()
    });
    
    // 向附近设备广播任务可用性
    this.broadcastTaskAvailability(taskId);
    
    return taskId;
  }
  
  // 发现附近可接力的设备
  async discoverContinuityDevices(): Promise<void> {
    const devices = await continuity.discoverDevices({
      serviceType: 'task.continuity',
      timeout: 5000
    });
    
    this.availableDevices = devices.map(device => ({
      id: device.deviceId,
      name: device.deviceName,
      type: device.deviceType,
      capabilities: device.capabilities,
      signalStrength: device.signalStrength
    }));
    
    // 更新UI显示可用设备
    this.updateDeviceListUI();
  }
  
  // 启动任务流转
  async startTaskContinuity(
    taskId: string, 
    targetDeviceId: string
  ): Promise<ContinuityResult> {
    const task = this.currentTasks.get(taskId);
    if (!task) {
      throw new BusinessError({
        code: 2001,
        message: '任务不存在'
      });
    }
    
    // 准备任务状态数据
    const taskState = this.prepareTaskState(task);
    
    // 启动流转
    const result = await distributedMissionManager.continueMission({
      deviceId: targetDeviceId,
      mission: {
        bundleName: task.bundleName,
        abilityName: task.abilityName,
        parameters: {
          ...task.parameters,
          continuityData: taskState,
          sourceDevice: await this.getLocalDeviceId(),
          continuityTime: Date.now()
        }
      }
    });
    
    if (result.success) {
      // 更新任务状态
      task.status = 'transferred';
      task.targetDeviceId = targetDeviceId;
      task.transferTime = Date.now();
      
      // 可选：在本地暂停任务
      if (task.pauseOnTransfer) {
        await this.pauseLocalTask(taskId);
      }
      
      return {
        success: true,
        taskId,
        targetDeviceId,
        transferTime: Date.now()
      };
    }
    
    return {
      success: false,
      error: result.error
    };
  }
  
  // 接收其他设备流转过来的任务
  async onTaskReceived(missionInfo: MissionInfo): Promise<void> {
    const continuityData = missionInfo.parameters?.continuityData;
    const sourceDevice = missionInfo.parameters?.sourceDevice;
    
    if (!continuityData) {
      console.warn('接收到的任务缺少连续性数据');
      return;
    }
    
    // 恢复任务状态
    const restoredTask = await this.restoreTaskState(continuityData);
    
    // 添加到当前任务列表
    this.currentTasks.set(restoredTask.id, {
      ...restoredTask,
      sourceDeviceId: sourceDevice,
      receiveTime: Date.now()
    });
    
    // 显示任务接收通知
    await this.showTaskReceivedNotification(restoredTask, sourceDevice);
    
    // 自动恢复任务执行
    if (restoredTask.autoResume) {
      await this.resumeTask(restoredTask.id);
    }
  }
  
  // 任务状态同步（多设备同时编辑）
  async setupTaskStateSync(taskId: string, deviceIds: string[]): Promise<void> {
    const task = this.currentTasks.get(taskId);
    if (!task) return;
    
    // 创建状态同步通道
    const syncChannel = await continuity.createSyncChannel({
      channelId: `task_sync_${taskId}`,
      devices: deviceIds,
      syncMode: 'realtime'
    });
    
    // 监听本地任务状态变化
    task.onStateChange = (newState) => {
      // 同步到其他设备
      syncChannel.broadcast('stateUpdate', {
        taskId,
        state: newState,
        timestamp: Date.now(),
        sourceDevice: await this.getLocalDeviceId()
      });
    };
    
    // 接收其他设备的状态更新
    syncChannel.on('stateUpdate', (update) => {
      if (update.taskId === taskId && update.sourceDevice !== await this.getLocalDeviceId()) {
        // 应用远程状态更新
        this.applyRemoteStateUpdate(taskId, update.state);
      }
    });
    
    // 冲突解决
    syncChannel.on('conflict', (conflict) => {
      this.resolveStateConflict(taskId, conflict);
    });
  }
  
  private async resolveStateConflict(
    taskId: string, 
    conflict: StateConflict
  ): Promise<void> {
    const task = this.currentTasks.get(taskId);
    if (!task) return;
    
    // 基于时间戳的冲突解决
    if (conflict.localState.timestamp > conflict.remoteState.timestamp) {
      // 本地状态更新，使用本地状态
      await syncChannel.send(conflict.remoteDevice, 'resolveConflict', {
        resolution: 'useLocal',
        taskId
      });
    } else {
      // 远程状态更新，使用远程状态
      this.applyRemoteStateUpdate(taskId, conflict.remoteState);
      
      await syncChannel.send(conflict.remoteDevice, 'resolveConflict', {
        resolution: 'useRemote',
        taskId
      });
    }
  }
}

六、性能优化与调试

6.1 PC应用性能监控

// PerformanceMonitor.ets - 性能监控
import performance from '@ohos.performance';
import systemMemory from '@ohos.systemMemory';
import { hilog } from '@kit.PerformanceAnalysisKit';

class PerformanceMonitor {
  private metrics: PerformanceMetrics = {
    fps: 0,
    cpuUsage: 0,
    memoryUsage: 0,
    gpuUsage: 0,
    diskIO: 0,
    networkLatency: 0
  };
  
  private monitoringInterval: number | null = null;
  private performanceThresholds: PerformanceThresholds = {
    minFPS: 30,
    maxCPU: 80,
    maxMemory: 1024, // MB
    maxGPU: 70
  };
  
  // 开始性能监控
  startMonitoring(interval: number = 1000): void {
    if (this.monitoringInterval) {
      this.stopMonitoring();
    }
    
    this.monitoringInterval = setInterval(() => {
      this.collectPerformanceMetrics();
      this.checkPerformanceThresholds();
      this.logPerformanceData();
    }, interval);
    
    hilog.info(0x0000, 'Performance', '开始性能监控');
  }
  
  private async collectPerformanceMetrics(): Promise<void> {
    // 收集各项性能指标
    const metrics = await Promise.all([
      this.getFPS(),
      this.getCPUUsage(),
      this.getMemoryUsage(),
      this.getGPUUsage(),
      this.getDiskIO(),
      this.getNetworkLatency()
    ]);
    
    this.metrics = {
      fps: metrics[0],
      cpuUsage: metrics[1],
      memoryUsage: metrics[2],
      gpuUsage: metrics[3],
      diskIO: metrics[4],
      networkLatency: metrics[5]
    };
  }
  
  private async getFPS(): Promise<number> {
    const fpsData = await performance.getFPS();
    return fpsData.current;
  }
  
  private async getCPUUsage(): Promise<number> {
    const cpuData = await performance.getCPUUsage();
    return cpuData.total;
  }
  
  private async getMemoryUsage(): Promise<number> {
    const memoryInfo = await systemMemory.getMemoryInfo();
    return memoryInfo.used / 1024 / 1024; // 转换为MB
  }
  
  private checkPerformanceThresholds(): void {
    const warnings: string[] = [];
    
    if (this.metrics.fps < this.performanceThresholds.minFPS) {
      warnings.push(`FPS过低: ${this.metrics.fps}`);
    }
    
    if (this.metrics.cpuUsage > this.performanceThresholds.maxCPU) {
      warnings.push(`CPU使用率过高: ${this.metrics.cpuUsage}%`);
    }
    
    if (this.metrics.memoryUsage > this.performanceThresholds.maxMemory) {
      warnings.push(`内存使用过高: ${this.metrics.memoryUsage.toFixed(2)}MB`);
    }
    
    if (this.metrics.gpuUsage > this.performanceThresholds.maxGPU) {
      warnings.push(`GPU使用率过高: ${this.metrics.gpuUsage}%`);
    }
    
    if (warnings.length > 0) {
      this.emitPerformanceWarning(warnings);
    }
  }
  
  // 性能优化建议
  getOptimizationSuggestions(): OptimizationSuggestion[] {
    const suggestions: OptimizationSuggestion[] = [];
    
    if (this.metrics.fps < 45) {
      suggestions.push({
        area: '渲染',
        suggestion: '减少界面重绘，使用硬件加速',
        priority: 'high'
      });
    }
    
    if (this.metrics.memoryUsage > 800) {
      suggestions.push({
        area: '内存',
        suggestion: '释放未使用的缓存，优化图片资源',
        priority: 'medium'
      });
    }
    
    if (this.metrics.diskIO > 50) {
      suggestions.push({
        area: '存储',
        suggestion: '批量文件操作，减少小文件IO',
        priority: 'low'
      });
    }
    
    return suggestions;
  }
  
  // 生成性能报告
  generatePerformanceReport(): PerformanceReport {
    return {
      timestamp: Date.now(),
      duration: this.getMonitoringDuration(),
      averageMetrics: this.calculateAverageMetrics(),
      peakMetrics: this.getPeakMetrics(),
      optimizationSuggestions: this.getOptimizationSuggestions(),
      issuesDetected: this.getDetectedIssues()
    };
  }
}

6.2 内存泄漏检测

// MemoryLeakDetector.ets - 内存泄漏检测
import systemMemory from '@ohos.systemMemory';
import { hilog } from '@kit.PerformanceAnalysisKit';

class MemoryLeakDetector {
  private memorySnapshots: MemorySnapshot[] = [];
  private detectionInterval: number | null = null;
  private leakThreshold: number = 10; // MB
  private snapshotInterval: number = 30000; // 30秒
  
  startLeakDetection(): void {
    // 定期拍摄内存快照
    this.detectionInterval = setInterval(() => {
      this.takeMemorySnapshot();
      this.analyzeMemoryTrend();
    }, this.snapshotInterval);
    
    // 监听对象创建和销毁
    this.setupObjectTracking();
    
    hilog.info(0x0000, 'MemoryLeak', '开始内存泄漏检测');
  }
  
  private async takeMemorySnapshot(): Promise<void> {
    const memoryInfo = await systemMemory.getMemoryInfo();
    const heapInfo = await systemMemory.getHeapStatistics();
    
    const snapshot: MemorySnapshot = {
      timestamp: Date.now(),
      totalMemory: memoryInfo.total,
      usedMemory: memoryInfo.used,
      freeMemory: memoryInfo.free,
      heapSize: heapInfo.totalHeapSize,
      heapUsed: heapInfo.usedHeapSize,
      objectCount: this.getTrackedObjectCount()
    };
    
    this.memorySnapshots.push(snapshot);
    
    // 保持最近100个快照
    if (this.memorySnapshots.length > 100) {
      this.memorySnapshots.shift();
    }
  }
  
  private analyzeMemoryTrend(): void {
    if (this.memorySnapshots.length < 3) return;
    
    const recentSnapshots = this.memorySnapshots.slice(-5);
    const memoryIncrease = this.calculateMemoryIncrease(recentSnapshots);
    
    if (memoryIncrease > this.leakThreshold) {
      this.reportPotentialLeak(memoryIncrease, recentSnapshots);
    }
  }
  
  private setupObjectTracking(): void {
    // 使用WeakRef跟踪对象生命周期
    const trackedObjects = new Map<string, WeakRef<any>>();
    
    // 重写对象创建方法（示例）
    const originalCreate = Object.create;
    Object.create = function(proto, propertiesObject) {
      const obj = originalCreate.call(this, proto, propertiesObject);
      
      // 跟踪对象
      if (this.shouldTrackObject(obj)) {
        const objectId = `obj_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
        trackedObjects.set(objectId, new WeakRef(obj));
        
        // 设置对象销毁时的回调
        this.setupObjectFinalizer(obj, objectId);
      }
      
      return obj;
    };
  }
  
  // 生成泄漏报告
  generateLeakReport(): MemoryLeakReport {
    const recentSnapshots = this.memorySnapshots.slice(-10);
    const memoryTrend = this.calculateMemoryTrend(recentSnapshots);
    
    return {
      detectionTime: Date.now(),
      totalSnapshots: this.memorySnapshots.length,
      memoryTrend,
      potentialLeaks: this.identifyPotentialLeaks(),
      recommendations: this.getMemoryOptimizationRecommendations()
    };
  }
  
  // 内存优化建议
  private getMemoryOptimizationRecommendations(): string[] {
    const recommendations: string[] = [];
    
    if (this.memorySnapshots.length > 0) {
      const latestSnapshot = this.memorySnapshots[this.memorySnapshots.length - 1];
      
      if (latestSnapshot.heapUsed > 500 * 1024 * 1024) { // 500MB
        recommendations.push('考虑使用对象池减少对象创建');
      }
      
      if (latestSnapshot.objectCount > 10000) {
        recommendations.push('减少不必要的对象引用，及时释放资源');
      }
    }
    
    return recommendations;
  }
}