room.localParticipant.setCameraEnabled(true)
room.localParticipant.setMicrophoneEnabled(true)

// 创建一个用于屏幕采集的 intent launcher
// 必须在 onCreate() 之前注册，最好作为实例属性
val screenCaptureIntentLauncher = registerForActivityResult(
    ActivityResultContracts.StartActivityForResult()
) { result ->
    val resultCode = result.resultCode
    val data = result.data
    if (resultCode != Activity.RESULT_OK || data == null) {
        return@registerForActivityResult
    }
    lifecycleScope.launch {
        room.localParticipant.setScreenShareEnabled(true, data)
    }
}

// 需要开启屏幕共享时，执行以下操作
val mediaProjectionManager =
    getSystemService(MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
screenCaptureIntentLauncher.launch(mediaProjectionManager.createScreenCaptureIntent())

class MainActivity : AppCompatActivity() {

    lateinit var room: Room

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        // 创建 Room 对象。
        room = LiveKit.create(applicationContext)

        // 设置视频渲染器
        room.initVideoRenderer(findViewById<SurfaceViewRenderer>(R.id.renderer))

        connectToRoom()
    }

    private fun connectToRoom() {

        val url = "wss://your_host"
        val token = "your_token"

        lifecycleScope.launch {

            // 设置事件处理。
            launch {
                room.events.collect { event ->
                    when (event) {
                        is RoomEvent.TrackSubscribed -> onTrackSubscribed(event)
                        else -> {}
                    }
                }
            }

            // 连接到服务器。
            room.connect(
                url,
                token,
            )

            // 打开音频/视频录制。
            val localParticipant = room.localParticipant
            localParticipant.setMicrophoneEnabled(true)
            localParticipant.setCameraEnabled(true)
        }
    }

    private fun onTrackSubscribed(event: RoomEvent.TrackSubscribed) {
        val track = event.track
        if (track is VideoTrack) {
            attachVideo(track)
        }
    }

    private fun attachVideo(videoTrack: VideoTrack) {
        videoTrack.addRenderer(findViewById<SurfaceViewRenderer>(R.id.renderer))
        findViewById<View>(R.id.progress).visibility = View.GONE
    }
}

val room = LiveKit.create(
    appContext = application,
    overrides = LiveKitOverrides(
        audioOptions = AudioOptions(
            audioOutputType = AudioType.MediaAudioType()
        )
    )
)

coroutineScope.launch {
    room::activeSpeakers.flow.collectLatest { speakersList ->
        /*...*/
    }
}