HarmonyOS5 超级终端体验：测试手机+车机+智能家居的设备协同业务

以下为 ​​HarmonyOS 5超级终端多设备协同的完整ArkTS解决方案​​，包含设备发现、任务流转和状态同步的代码示例：

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1. 超级终端架构

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2. 设备发现与连接

2.1 设备扫描与配对

// device-discovery.ets
import { SuperDevice } from '@ohos.distributed';

export class DeviceScanner {
  static async findAvailableDevices() {
    return SuperDevice.scan({
      types: ['car', 'iot'],
      timeout: 5000,
      filter: (d) => d.battery > 20 // 仅显示电量>20%的设备
    });
  }

  static async connect(deviceId: string) {
    return SuperDevice.connect(deviceId, {
      auth: 'auto', // 自动认证
      transports: ['ble', 'wifi-direct']
    });
  }
}

2.2 设备能力协商

// capability-negotiation.ets
export async function negotiateCapabilities(deviceIds: string[]) {
  const devices = await Promise.all(
    deviceIds.map(id => SuperDevice.getCapabilities(id))
  );
  
  return {
    display: devices.some(d => d.capabilities.includes('4k-screen')),
    input: devices.some(d => d.capabilities.includes('voice-input')),
    compute: devices.some(d => d.cpuCores >= 8)
  };
}

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3. 任务无缝流转

3.1 导航流转到车机

// navigation-handoff.ets
export async function handoffNavigationToCar() {
  const car = await DeviceScanner.findDeviceByType('car');
  if (!car) return;

  await TaskFlow.transfer({
    type: 'navigation',
    data: {
      route: Navigation.getCurrentRoute(),
      preferences: Settings.getNavigationPrefs()
    },
    target: car.id,
    priority: 'high'
  });
}

3.2 音乐跨设备接力

// media-handoff.ets
@Component
struct MediaController {
  @State currentDevice?: Device;

  async transferPlayback(target: Device) {
    await MediaSession.transfer({
      content: Player.getCurrentMedia(),
      position: Player.getCurrentTime(),
      target: target.id
    });
    this.currentDevice = target;
  }
}

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4. 硬件能力池化

4.1 分布式摄像头调用

// distributed-camera.ets
export async function useBestCamera() {
  const cameras = await SuperDevice.findByCapability('camera');
  const bestCamera = cameras.sort((a, b) => 
    b.megapixels - a.megapixels
  )[0];
  
  return CameraRemote.open(bestCamera.id, {
    resolution: '4K',
    control: 'exclusive'
  });
}

4.2 算力共享

// compute-pool.ets
export async function distributeAICompute(task: AI.Task) {
  const devices = await SuperDevice.getAvailableCompute();
  const assignments = loadBalancer.distribute(task, devices);
  
  return Promise.all(
    assignments.map(async ({deviceId, subtask}) => {
      return ComputeNode.execute(deviceId, subtask);
    })
  );
}

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5. 状态实时同步

5.1 设备状态同步

// state-sync.ets
export class DeviceStateSyncer {
  private static syncMap = new Map<string, Subscription>();

  static sync(key: string, source: Device, targets: Device[]) {
    const subscription = StateStore.subscribe(source.id, key, (value) => {
      targets.forEach(device => {
        StateStore.update(device.id, key, value);
      });
    });
    
    this.syncMap.set(key, subscription);
  }

  static stopSync(key: string) {
    this.syncMap.get(key)?.unsubscribe();
  }
}

5.2 环境自适应

// context-awareness.ets
export function adjustByEnvironment() {
  ContextObserver.onChange((ctx) => {
    if (ctx.location === 'car') {
      UIRenderer.setLayout('driving-mode');
      AudioProfile.set('car-audio');
    } else if (ctx.location === 'home') {
      UIRenderer.setLayout('relax-mode');
      DevicePower.saveEnergy();
    }
  });
}

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6. 安全与权限

6.1 跨设备权限管理

// cross-device-permission.ets
export async function checkPermission(deviceId: string, permission: string) {
  return SuperDevice.checkPermission({
    target: deviceId,
    permission,
    justification: '需要访问您的屏幕进行任务接力'
  });
}

6.2 数据加密通道

// secure-channel.ets
export async function createSecureChannel(deviceId: string) {
  return SecureChannel.connect(deviceId, {
    algorithm: 'ECDH-AES256',
    keyExchange: 'in-band',
    verify: (fingerprint) => DeviceTrustList.verify(fingerprint)
  });
}

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7. 故障恢复机制

7.1 自动重连策略

// reconnect-manager.ets
export class ReconnectManager {
  private retries = new Map<string, number>();

  async ensureConnected(deviceId: string) {
    try {
      if (!SuperDevice.isConnected(deviceId)) {
        await SuperDevice.connect(deviceId);
      }
    } catch (err) {
      const count = this.retries.get(deviceId) || 0;
      if (count < 3) {
        this.retries.set(deviceId, count + 1);
        await delay(1000);
        return this.ensureConnected(deviceId);
      }
      throw new Error(`设备${deviceId}连接失败`);
    }
  }
}

7.2 状态一致性检查

// consistency-checker.ets
export async function verifyStateConsistency(devices: Device[]) {
  const states = await Promise.all(
    devices.map(d => StateStore.get(d.id, 'current_media'))
  );
  
  if (new Set(states).size > 1) {
    await StateStore.sync('current_media', devices[0].id, devices.slice(1));
  }
}

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8. 完整业务场景示例

8.1 回家场景自动化

// home-automation.ets
export async function triggerHomeScene() {
  // 1. 发现家庭设备
  const devices = await DeviceScanner.findAvailableDevices();
  const homeDevices = devices.filter(d => d.location === 'home');
  
  // 2. 同步手机状态
  await StateStore.batchUpdate(
    homeDevices.map(d => ({
      device: d.id,
      key: 'user_presence',
      value: 'arrived'
    }))
  );
  
  // 3. 启动协同任务
  await TaskCoordinator.run('welcome_home', {
    lights: 'warm_30%',
    ac: '24c',
    music: 'playlist:relax'
  });
}

8.2 车机互联场景

// car-connect.ets
@Component
struct CarLink {
  @State car?: Device;

  async onInit() {
    this.car = await DeviceScanner.findDeviceByType('car');
    DeviceStateSyncer.sync('navigation', this.car, [AppDevice.id]);
  }

  build() {
    Column() {
      if (this.car) {
        Button('流转导航到车机')
          .onClick(() => handoffNavigationToCar(this.car!))
      }
    }
  }
}

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9. 关键性能指标

指标	目标值	测量工具
设备发现时间	<2秒	SuperDevice.scan()
任务流转延迟	<500ms	TaskFlow.transfer()
状态同步一致性	100%	StateStore.verify()
跨设备调用成功率	>99.9%	设备日志分析

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10. 调试工具集成

10.1 虚拟设备模拟器

// device-simulator.ets
export class VirtualDevice {
  static create(type: string) {
    return SuperDevice.registerVirtual({
      type,
      capabilities: getDefaultCapabilities(type),
      behaviors: getDefaultBehaviors(type)
    });
  }
}

// 使用示例
VirtualDevice.create('car');
VirtualDevice.create('smart-tv');

10.2 协同日志分析

// coop-logger.ets
export function analyzeCooperationLogs() {
  return LogAnalyzer.query({
    types: ['device_handshake', 'task_transfer'],
    period: '24h',
    metrics: ['success_rate', 'latency']
  });
}

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11. 示例项目结构

super-device/
├── src/
│   ├── device/          # 设备管理
│   ├── task/            # 任务流转
│   ├── state/           # 状态同步
│   └── scenarios/       # 业务场景
├── assets/
│   └── profiles/        # 设备能力配置
└── tools/
    ├── simulator/        # 设备模拟
    └── analyzer/         # 日志分析

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通过本方案可实现：

1. ​​秒级​​ 设备发现与连接
2. ​​无缝​​ 任务跨设备流转
3. ​​原子级​​ 状态一致性
4. ​​自适应​​ 场景化协同