CallViewModel.kt
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package io.livekit.android.sample
import android.app.Application
import android.content.Intent
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.viewModelScope
import com.snakydesign.livedataextensions.distinctUntilChanged
import io.livekit.android.ConnectOptions
import io.livekit.android.LiveKit
import io.livekit.android.events.RoomEvent
import io.livekit.android.events.collect
import io.livekit.android.room.Room
import io.livekit.android.room.participant.Participant
import io.livekit.android.room.participant.RemoteParticipant
import io.livekit.android.room.track.CameraPosition
import io.livekit.android.room.track.LocalVideoTrack
import io.livekit.android.room.track.Track
import io.livekit.android.sample.util.hide
import kotlinx.coroutines.launch
class CallViewModel(
val url: String,
val token: String,
application: Application
) : AndroidViewModel(application) {
private val mutableRoom = MutableLiveData<Room>()
val room = mutableRoom.hide()
private val mutableParticipants = MutableLiveData<List<Participant>>()
val participants = mutableParticipants.hide()
private val mutableActiveSpeaker = MutableLiveData<Participant>()
val activeSpeaker = mutableActiveSpeaker.hide().distinctUntilChanged()
private val mutableVideoEnabled = MutableLiveData<Boolean>()
val videoEnabled = mutableVideoEnabled.hide().distinctUntilChanged()
private val mutableMicEnabled = MutableLiveData<Boolean>()
val micEnabled = mutableMicEnabled.hide().distinctUntilChanged()
private val mutableScreenshareEnabled = MutableLiveData<Boolean>()
val screenshareEnabled = mutableScreenshareEnabled.hide().distinctUntilChanged()
init {
viewModelScope.launch {
val room = LiveKit.connect(
application,
url,
token,
ConnectOptions(),
null
)
launch {
room.events.collect {
handleRoomEvent(it)
}
}
val localParticipant = room.localParticipant
val audioTrack = localParticipant.createAudioTrack()
localParticipant.publishAudioTrack(audioTrack)
val videoTrack = localParticipant.createVideoTrack()
localParticipant.publishVideoTrack(videoTrack)
videoTrack.startCapture()
updateParticipants(room)
mutableActiveSpeaker.value = localParticipant
mutableRoom.value = room
mutableVideoEnabled.value =
!(localParticipant.getTrackPublication(Track.Source.CAMERA)?.muted ?: false)
mutableMicEnabled.value =
!(localParticipant.getTrackPublication(Track.Source.MICROPHONE)?.muted ?: false)
mutableScreenshareEnabled.value = false
}
}
private fun handleRoomEvent(event: RoomEvent) {
when (event) {
is RoomEvent.ParticipantConnected -> updateParticipants(event.room)
is RoomEvent.ParticipantDisconnected -> updateParticipants(event.room)
is RoomEvent.ActiveSpeakersChanged -> handleActiveSpeakersChanged(event.speakers)
}
}
private fun updateParticipants(room: Room) {
val participantList = listOf(room.localParticipant) +
room.remoteParticipants
.keys
.sortedBy { it }
.mapNotNull { room.remoteParticipants[it] }
mutableParticipants.postValue(participantList)
if (!participantList.contains(mutableActiveSpeaker.value) || mutableActiveSpeaker.value == null) {
// active speaker has left, choose someone else at random.
mutableActiveSpeaker.postValue(participantList.last())
}
}
fun handleActiveSpeakersChanged(speakers: List<Participant>) {
// If old active speaker is still active, don't change.
if (speakers.isEmpty() || speakers.contains(mutableActiveSpeaker.value)) {
return
}
val newSpeaker = speakers
.filter { it is RemoteParticipant } // Try not to display local participant as speaker.
.firstOrNull() ?: return
mutableActiveSpeaker.postValue(newSpeaker)
}
override fun onCleared() {
super.onCleared()
mutableRoom.value?.disconnect()
}
fun setCameraEnabled(enabled: Boolean) {
val localParticipant = room.value?.localParticipant ?: return
viewModelScope.launch {
localParticipant.setCameraEnabled(enabled)
mutableVideoEnabled.postValue(enabled)
}
}
fun setMicEnabled(enabled: Boolean) {
val localParticipant = room.value?.localParticipant ?: return
viewModelScope.launch {
localParticipant.setMicrophoneEnabled(enabled)
mutableMicEnabled.postValue(enabled)
}
}
fun setScreenshare(
enabled: Boolean,
mediaProjectionPermissionResultData: Intent? = null
) {
val localParticipant = room.value?.localParticipant ?: return
viewModelScope.launch {
localParticipant.setScreenShareEnabled(enabled, mediaProjectionPermissionResultData)
mutableScreenshareEnabled.postValue(enabled)
}
}
fun flipCamera() {
val localParticipant = room.value?.localParticipant ?: return
val localVideoTrack = localParticipant
.getTrackPublication(Track.Source.CAMERA)
?.track as? LocalVideoTrack
?: return
val currentOptions = localVideoTrack.options
val newPosition = when (currentOptions.position) {
CameraPosition.FRONT -> CameraPosition.BACK
CameraPosition.BACK -> CameraPosition.FRONT
null -> null
}
if (newPosition != null) {
localVideoTrack.restartTrack(options = currentOptions.copy(position = newPosition))
}
}
}