Android Kotlin SDK for LiveKit

Official Android Client SDK for LiveKit. Easily add video & audio capabilities to your Android apps.

Table of Contents

• Docs
• Installation
• Usage
  • Permissions
  • Publishing camera and microphone
  • Sharing screen
  • Rendering subscribed tracks
  • @FlowObservable
• Sample App
• Dev Environment
  • Optional (Dev convenience)

Docs

Docs and guides at https://docs.livekit.io.

API reference can be found at https://docs.livekit.io/client-sdk-android/index.html .

Installation

LiveKit for Android is available as a Maven package.

...
dependencies {
  implementation "io.livekit:livekit-android:1.1.5"
  // Snapshots of the latest development version are available at:
  // implementation "io.livekit:livekit-android:1.1.6-SNAPSHOT"
}

You'll also need jitpack as one of your repositories.

subprojects {
    repositories {
        google()
        mavenCentral()
        // ...
        maven { url 'https://jitpack.io' }
        
        // For SNAPSHOT access
        // maven { url 'https://s01.oss.sonatype.org/content/repositories/snapshots/' }
    }
}

Usage

Permissions

LiveKit relies on the RECORD_AUDIO and CAMERA permissions to use the microphone and camera. These permission must be requested at runtime. Reference the sample app for an example.

Publishing camera and microphone

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

Sharing screen

// create an intent launcher for screen capture
// this *must* be registered prior to onCreate(), ideally as an instance val
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)
    }
}

// when it's time to enable the screen share, perform the following
val mediaProjectionManager =
    getSystemService(MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
screenCaptureIntentLauncher.launch(mediaProjectionManager.createScreenCaptureIntent())

Rendering subscribed tracks

LiveKit uses SurfaceViewRenderer to render video tracks. A TextureView implementation is also provided through TextureViewRenderer. Subscribed audio tracks are automatically played.

class MainActivity : AppCompatActivity() {

    lateinit var room: Room

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

        setContentView(R.layout.activity_main)

        // Create Room object.
        room = LiveKit.create(applicationContext)

        // Setup the video renderer
        room.initVideoRenderer(findViewById<SurfaceViewRenderer>(R.id.renderer))

        connectToRoom()
    }

    private fun connectToRoom() {

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

        lifecycleScope.launch {

            // Setup event handling.
            launch {
                room.events.collect { event ->
                    when (event) {
                        is RoomEvent.TrackSubscribed -> onTrackSubscribed(event)
                        else -> {}
                    }
                }
            }

            // Connect to server.
            room.connect(
                url,
                token,
            )

            // Turn on audio/video recording.
            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
    }
}

See the basic sample app for the full implementation.

@FlowObservable

Properties marked with @FlowObservable can be accessed as a Kotlin Flow to observe changes directly:

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

Sample App

Note: If you wish to run the sample apps directly from this repo, please consult the Dev Environment instructions.

We have a basic quickstart sample app here, showing how to connect to a room, publish your device's audio/video, and display the video of one remote participant.

There are two more full featured video conferencing sample apps:

• Compose app
• Standard app

They both use the CallViewModel , which handles the Room connection and exposes the data needed for a basic video conferencing app.

The respective ParticipantItem class in each app is responsible for the displaying of each participant's UI.

• Compose ParticipantItem
• Standard ParticipantItem

Dev Environment

To develop the Android SDK or running the sample app directly from this repo, you'll need:

• Clone the repo to your computer
• Ensure the protocol submodule repo is initialized and updated

git clone https://github.com/livekit/client-sdk-android.git
cd client-sdk-android
git submodule update --init

---

For those developing on Apple M1 Macs, please add below to $HOME/.gradle/gradle.properties

protoc_platform=osx-x86_64

Optional (Dev convenience)

1. Download webrtc sources from https://webrtc.googlesource.com/src
2. Add sources to Android Studio by pointing at the webrtc/sdk/android folder.