鸿蒙开发中的跨设备适配如何实现？

@Component
struct AdaptiveGrid {
  @StorageLink('windowType') windowType: string = 'phone'

  build() {
    GridRow({
      columns: this.windowType === 'phone' ? 4 : 
               this.windowType === 'tablet' ? 8 : 12
    }) {
      ForEach(this.items, (item) => {
        GridCol({ span: { xs: 2, sm: 1, md: 1 } }) {
          ItemComponent(item)
        }
      })
    }
    .onAreaChange((oldVal, newVal) => {
      this.windowType = newVal.width >= 600 ? 'tablet' : 'phone'
    })
  }
}
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resources/
├── base/         # 默认资源
├── phone/        # 手机专属
├── tablet/       # 平板专属  
├── wearable/     # 手表专属
└── car/          # 车机专属
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<!-- 不同设备加载不同尺寸图片 -->
<image src="$media:device_${deviceType}_bg" />
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@Entry
@Component
struct DistributedUI {
  @State currentComponent: string = ''

  build() {
    Column() {
      if (this.currentComponent === 'watch') {
        WatchFaceComponent()
      } else if (this.currentComponent === 'tv') {
        TVControlPanel()
      } else {
        DefaultPhoneUI()
      }
    }
    .onDeviceConnect((device) => {
      this.currentComponent = device.type
    })
  }
}
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function checkCameraAbility() {
  try {
    const cameraCap = capability.getCameraSupport()
    if (cameraCap.level === 'FULL') {
      return new ProCamera()
    } else if (cameraCap.level === 'BASIC') {
      return new SimpleCamera()
    } else {
      return new MockCamera()
    }
  } catch (e) {
    logger.error('Camera not available', e)
    return null
  }
}
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graph TD
    A[设备类型] --> B{高性能设备?}
    B -->|是| C[启用60FPS动画]
    B -->|否| D[降级到30FPS]
    D --> E{手表类设备?}
    E -->|是| F[禁用复杂阴影]
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class MemoryManager {
  static adjustCache() {
    const memInfo = device.getMemoryInfo()
    if (memInfo.avail < memInfo.thresholds.warning) {
      ImageCache.reduceSize(0.5)
      DataModel.clearTempData()
    }
  }
}
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# 同时调试多个设备
hdc emulator start -n phone watch tv

# 查看跨设备调用链
hdc shell分布式日志 -t flow
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Text(content)
  .fontSize(this.windowType === 'watch' ? 14 : 16)
  .maxLines(this.windowType === 'watch' ? 3 : 0)
  .lineHeight(this.windowType === 'watch' ? '120%' : '140%')
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Button('导航')
  .onClick(() => {
    if (device.type === 'car') {
      voiceControl.execute('开始导航')
    } else {
      this.startNavigation()
    }
  })
  .focusable(device.type === 'car')
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Column() {
  // AI引擎自动调整间距
  AILayout.optimize(this.children)
}
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# 按需加载设备专属能力包
hpm load --device=watch --feature=health
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// 统一3D操作接口
ThreeDController.registerHandler({
  phone: TouchHandler,
  car: VoiceGestureHandler,
  vr: SpaceControllerHandler
})
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// 通用组件适配模板
@Component
export struct AdaptiveComponent {
  @Prop config: {
    phone: UIConfig,
    tablet: UIConfig,
    watch: UIConfig
  }

  @State currentConfig: UIConfig

  onDeviceChange(type: DeviceType) {
    this.currentConfig = this.config[type]
  }

  build() {
    Column(this.currentConfig.styles) {
      // 动态内容
    }
  }
}
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# 自动化跨设备测试脚本
hdc test --device-group all --case adaptive_layout
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