在 Android 上使用 Home API 构建移动应用

$ git clone -b codelab-branch-1 https://github.com/google-home/google-home-api-sample-app-android.git

companion object {

  // List of supported device types by this app:
  val supportedTypes: List<DeviceTypeFactory<out DeviceType>> = listOf(
    OnOffLightDevice,
    DimmableLightDevice,

  // ...
  )
  // List of supported device traits by this app:
  val supportedTraits: List<TraitFactory<out Trait>> = listOf(
  OnOff,
  LevelControl,
  // ...
  )
}

companion object {
// List of supported device types by this app:
val supportedTypes: List<DeviceTypeFactory<out DeviceType>> = listOf(
// TODO: 4.1.1 - Non-registered device types will be unsupported
//             ContactSensorDevice,
//             ColorTemperatureLightDevice,
//             DimmableLightDevice,
//             ExtendedColorLightDevice,
//             GenericSwitchDevice,
//             GoogleDisplayDevice,
//             GoogleTVDevice,
//             OccupancySensorDevice,
//             OnOffLightDevice,
//             OnOffLightSwitchDevice,
//             OnOffPluginUnitDevice,
//             OnOffSensorDevice,
//             RootNodeDevice,
//             SpeakerDevice,
//             ThermostatDevice,
)
// List of supported device traits by this app:
val supportedTraits: List<TraitFactory<out Trait>> = listOf(
// TODO: 4.1.2 - Non-registered traits will be unsupported
//             AreaAttendanceState,
//             AreaPresenceState,
//             Assistant,
//             AssistantBroadcast,
//             AssistantFulfillment,
//             BasicInformation,
//             BooleanState,
//             OccupancySensing,
//             OnOff,
//             Notification,
//             LevelControl,
//             TemperatureControl,
//             TemperatureMeasurement,
//             Thermostat,
//             Time,
//             Volume,
        )
}

// Registry to record device types and traits used in this app:
val registry = FactoryRegistry(
  types = supportedTypes,
  traits = supportedTraits
)
// Configuration options for the HomeClient:
val config = HomeConfig(
  coroutineContext = Dispatchers.IO,
  factoryRegistry = registry
)
// Initialize the HomeClient, which is the primary object to use all Home APIs:
homeClient = Home.getClient(context = context, homeConfig = config)

homeClient.registerActivityResultCallerForPermissions(activity)

try {
    val result: PermissionsResult
    result = homeClient.requestPermissions(forceLaunch = true)
    when (result.status) {
        PermissionsResultStatus.SUCCESS -> // Success Case
        PermissionsResultStatus.CANCELLED -> // User Cancelled
        PermissionsResultStatus.ERROR -> // Some Error
else -> // Unsupported Case
    }
}
catch (e: HomeException) { ... }

try {
    val state: PermissionsState
    state = homeClient.hasPermissions().first { state ->
        state != PermissionsState.PERMISSIONS_STATE_UNINITIALIZED
    }
    when (state) {
        PermissionsState.GRANTED -> // Signed In
        PermissionsState.NOT_GRANTED -> // Not Signed In
        PermissionsState.PERMISSIONS_STATE_UNAVAILABLE -> // ...
        PermissionsState.PERMISSIONS_STATE_UNINITIALIZED -> // ...
else -> // Unsupported case
    }
}
catch (e: HomeException) { ... }

       homeClient.hasPermissions().collect( { state ->
// Track the changes on state
        } )

fun requestPermissions() {
    scope.launch {
    try {
// TODO: 4.3.1 - Request the permissions from the Permissions API
//                 // Request permissions from the Permissions API and record the result:
//                 val result: PermissionsResult = client.requestPermissions(forceLaunch = true)
//                 // Adjust the sign-in status according to permission result:
//                 if (result.status == PermissionsResultStatus.SUCCESS)
//                     isSignedIn.emit(true)
//                 // Report the permission result:
//                 reportPermissionResult(result)
    }
    catch (e: HomeException) { MainActivity.showError(this, e.message.toString()) }
    }
}

// Get the a snapshot of all structures from the current homeClient
val allStructures : Set<Structure> =
    homeClient.structures()   // HomeObjectsFlow<Structure>
    .list()                   // Set<Structure>

   private suspend fun subscribeToStructures() {
// TODO: 5.1.1 - Subscribe the structure data changes
// // Subscribe to structures returned by the Structures API:
// homeApp.homeClient.structures().collect { structureSet ->
//     val structureVMList: MutableList<StructureViewModel> = mutableListOf()
//     // Store structures in container ViewModels:
//     for (structure in structureSet) {
//         structureVMList.add(StructureViewModel(structure))
//     }
//     // Store the ViewModels:
//     structureVMs.emit(structureVMList)
//
//     // If a structure isn't selected yet, select the first structure from the list:
//     if (selectedStructureVM.value == null && structureVMList.isNotEmpty())
//         selectedStructureVM.emit(structureVMList.first())
//
// }
}

   val structureVMs: List<StructureViewModel> = homeAppVM.structureVMs.collectAsState().value
...
DropdownMenu(expanded = expanded, onDismissRequest = { expanded = false }) {
// TODO: 5.1.2 - Show list of structures in DropdownMenu
//  for (structure in structureVMs) {
//      DropdownMenuItem(
//          text = { Text(structure.name) },
//          onClick = {
//              scope.launch { homeAppVM.selectedStructureVM.emit(structure) }
//              expanded = false
//          }
//      )
//  }
}
...

val rooms: Set<Room>
rooms = structure.rooms().list()

val devices: Set<HomeDevice>
devices = room.devices().list()

val devicesWithoutRooms: MutableSet<HomeDevice> = mutableSetOf()

for (device in structure.devices().list())
if (device.roomId == null)
  devicesWithoutRooms.add(device)

val roomVMs : MutableStateFlow<List<RoomViewModel>>
val deviceVMs : MutableStateFlow<List<DeviceViewModel>>
val deviceVMsWithoutRooms : MutableStateFlow<List<DeviceViewModel>>
private suspend fun subscribeToRooms() {
// TODO: 5.2.1 - Subscribe the room data changes
//   // Subscribe to changes on rooms:
//   structure.rooms().collect { roomSet ->
//       val roomVMs = mutableListOf<RoomViewModel>()
//       // Store rooms in container ViewModels:
//       for (room in roomSet) {
//           roomVMs.add(RoomViewModel(room))
//       }
//       // Store the ViewModels:
//       this.roomVMs.emit(roomVMs)
//   }
}
private suspend fun subscribeToDevices() {
// TODO: 5.2.2 - Subscribe the device data changes in a structure
//   // Subscribe to changes on devices:
//   structure.devices().collect { deviceSet ->
//       val deviceVMs = mutableListOf<DeviceViewModel>()
//       val deviceWithoutRoomVMs = mutableListOf<DeviceViewModel>()
//       // Store devices in container ViewModels:
//       for (device in deviceSet) {
//           val deviceVM = DeviceViewModel(device)
//           deviceVMs.add(deviceVM)
//           // For any device that's not in a room, additionally keep track of a separate list:
//           if (device.roomId == null)
//               deviceWithoutRoomVMs.add(deviceVM)
//       }
//       // Store the ViewModels:
//       this.deviceVMs.emit(deviceVMs)
//       deviceVMsWithoutRooms.emit(deviceWithoutRoomVMs)
//   }
    }

val selectedRoomVMs: List<RoomViewModel> =
selectedStructureVM.roomVMs.collectAsState().value
...
for (roomVM in selectedRoomVMs) {
// TODO: 5.2.3 - Render the list of rooms
//   RoomListItem(roomVM)
// TODO: 5.2.4 - Render the list of devices in a room
//   val deviceVMsInRoom: List<DeviceViewModel> = roomVM.deviceVMs.collectAsState().value
//
//   for (deviceVM in deviceVMsInRoom) {
//       DeviceListItem(deviceVM, homeAppVM)
//   }
}

val id: String = device.id.id
val name: String = device.name
val connectivity: ConnectivityState =
    device.sourceConnectivity.connectivityState

device.types().collect { typeSet ->
var primaryType : DeviceType = UnknownDeviceType()
for (typeInSet in typeSet)
if (typeInSet.metadata.isPrimaryType)
                    primaryType = typeInSet
            val traits: List<Trait> = mutableListOf()
for (trait in primaryType.traits())
if (trait.factory in myTraits)
                    traits.add(trait)
for (trait in traits)
                parseTrait(trait, primaryType)
        }

fun <T : Trait?> parseTrait(trait : T, type: DeviceType) {
    val status : String = when (trait) {
        is OnOff -> { if (trait.onOff) "On" else "Off" }
        is LevelControl -> { trait.currentLevel.toString() }
        is BooleanState -> {
            when (type.factory) {
                ContactSensorDevice -> {
if (trait.stateValue) "Closed"
else "Open"
                }
else -> ...
            }
        }
else -> ...
    }
}

private suspend fun subscribeToType() {
// Subscribe to changes on device type, and the traits/attributes within:
device.types().collect { typeSet ->
// Container for the primary type for this device:
var primaryType : DeviceType = UnknownDeviceType()
...
// TODO: 6.1.1 - Determine the primary type for this device
//       // Among all the types returned for this device, find the primary one:
//       for (typeInSet in typeSet)
//           if (typeInSet.metadata.isPrimaryType)
//               primaryType = typeInSet
//
//       // Optional: For devices with a single type that did not define a primary:
//       if (primaryType is UnknownDeviceType && typeSet.size == 1)
//           primaryType = typeSet.first()
// Container for list of supported traits present on the primary device type:
val supportedTraits: List<Trait> = getSupportedTraits(primaryType.traits())
...
}
fun getSupportedTraits(traits: Set<Trait>) : List<Trait> {
           val supportedTraits: MutableList<Trait> = mutableListOf()
// TODO: 6.1.2 - Get only the supported traits for this device
//   for (trait in traits)
//       if (trait.factory in HomeApp.supportedTraits)
//           supportedTraits.add(trait)
return supportedTraits
}

Box (Modifier.padding(horizontal = 24.dp, vertical = 8.dp)) {
when (trait) {
is OnOff -> {
// TODO: 6.1.3 - Render controls based on the trait type
// Column (Modifier.fillMaxWidth()) {
//     Text(trait.factory.toString(), fontSize = 20.sp)
//     Text(DeviceViewModel.getTraitStatus(trait, type), fontSize = 16.sp)
// }
...
}
is LevelControl -> {
      ...
  }
   is BooleanState -> {
      ...
  }
   is OccupancySensing -> {
      ...
  }
  ...
}

fun <T : Trait?> issueCommand(trait : T) {
     when (trait) {
         is OnOff -> {
// trait.on()
// trait.off()
   }
   is LevelControl -> {
// trait.moveToLevel(...)
// trait.moveToLevelWithOnOff(...)
        }
    }
}

Box (Modifier.padding(horizontal = 24.dp, vertical = 8.dp)) {
when (trait) {
is OnOff -> {
                ....
// TODO: 6.2.1 - Render controls based on the trait type
//   Switch (checked = (trait.onOff == true), modifier = Modifier.align(Alignment.CenterEnd),
//       onCheckedChange = { state ->
//           scope.launch { if (state) trait.on() else trait.off() }
//       },
//       enabled = isConnected
//   )
}

var launcher: ActivityResultLauncher<IntentSenderRequest>
lateinit var commissioningResult: CommissioningResult?
launcher = activity.registerForActivityResult(StartIntentSenderForResult()) { result ->
try {
  commissioningResult = CommissioningResult.fromIntentSenderResult(
      result.resultCode, result.data)
  } catch (exception: ApiException) {
// Catch any issues
 }
}

fun requestCommissioning() {
// Retrieve the onboarding payload used when commissioning devices:
val payload = activity.intent?.getStringExtra(Matter.EXTRA_ONBOARDING_PAYLOAD)
  scope.launch {
    // Create a commissioning request to store the device in Google's Fabric:
    val request = CommissioningRequest.builder()
      .setStoreToGoogleFabric(true)
      .setOnboardingPayload(payload)
      .build()
    // Initialize client and sender for commissioning intent:
    val client: CommissioningClient = Matter.getCommissioningClient(context)
    val sender: IntentSender = client.commissionDevice(request).await()
    // Launch the commissioning intent on the launcher:
    launcher.launch(IntentSenderRequest.Builder(sender).build())
  }
}

// Called by +Add Device button in DeviceView.kt
fun requestCommissioning() {
// Retrieve the onboarding payload used when commissioning devices:
val payload = activity.intent?.getStringExtra(Matter.EXTRA_ONBOARDING_PAYLOAD)
// TODO: 7.1.1 - Launch the commissioning intent
// scope.launch {
//     // Create a commissioning request to store the device in Google's Fabric:
//     val request = CommissioningRequest.builder()
//         .setStoreToGoogleFabric(true)
//         .setOnboardingPayload(payload)
//         .build()
//     // Initialize client and sender for commissioning intent:
//     val client: CommissioningClient = Matter.getCommissioningClient(context)
//     val sender: IntentSender = client.commissionDevice(request).await()
//     // Launch the commissioning intent on the launcher:
//     launcher.launch(IntentSenderRequest.Builder(sender).build())
// }
}