Android 上的 Hub 激活 API

借助 Hub Activation API，您可以程序化地发现和激活 Google Home 中枢。如果用户无法通过其他方式激活中枢（例如中枢没有屏幕），此方法就非常有用。

使用 Hub Activation API

借助 Hub 激活 API，您可以构建能够发现和激活 Hub 的应用。

1. 获取对结构中 HubManagementTrait 的引用：

   val hubManagementTrait =
     hubManagementTraitFlow.firstOrNull {
       it.metadata.sourceConnectivity?.connectivityState == ConnectivityState.ONLINE
     }
   if (hubManagementTrait == null) {
     errorsEmitter.emit(HomeException.notFound("HubManagement trait isn't online"))
   }
   

2. 识别 Wi-Fi 网络中支持中枢的设备：

   try {
     val unused = hubManagementTrait.discoverAvailableHubs()
   } catch (e: Exception) {
     Log.d(TAG_HUB_DISCOVERY, "Error discovering hubs $e")
     errorsEmitter.emit(e)
   }
   
   val hubManagementTraitFlow = structureFlow.flatMapLatest { it.trait(HubManagement) }
   
   val discoveredHubs =
     hubManagementTraitFlow
       .map { it.discoveredHubsList }
       .handleErrors()
       .flowOn(ioDispatcher)
       .stateIn(
         scope = CoroutineScope(viewModelScope.coroutineContext + ioDispatcher),
         started = SharingStarted.WhileSubscribed(),
         listOf(),
       )
   

3. 启用支持 hub 的设备：

   try {
     val unused = hubManagementTrait.activateHub(hub)
   } catch (e: Exception) {
     Log.d("Hub Activation", "Error activating hub $e")
   }