Android 上的 Hub Activation API

您可以使用 Hub Activation API 建構應用程式，以便探索及啟用中樞裝置。步驟如下：

1. 取得結構中 HubManagementTrait 的參照：

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

2. 找出 Wi-Fi 網路中可做為中樞裝置的裝置：

   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. 啟用支援中樞裝置的裝置：

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