Display Attendees Count - Android

In this guide, we will see how you can display the number of attendees in realtime.

note

Before going forward in this guide, do make sure all the attendees join the live stream with mode as Mode.SIGNALLING_ONLY

• We will get all the participants except the local participant using the participants property of the Room class. From these participants, we will count the ones who have joined as SIGNALLING_ONLY and then display that count.

private fun showViewerCount() {
    // count the local participant only when it is an attendee
    var viewerCount = if (room!!.localParticipant.mode == Mode.SIGNALLING_ONLY) 1 else 0
    val participants = room!!.participants
    for (entry: Map.Entry<String, Participant> in participants.entries) {
        val participant = entry.value
        if (participant.mode == Mode.SIGNALLING_ONLY) {
            viewerCount++
        }
    }
    this.viewerCount!!.text = viewerCount.toString()
}

• To keep the count up to date, call showViewerCount() again when you join the room, and whenever a participant joins, leaves or changes mode.

private val roomEventListener: RoomEventListener = object : RoomEventListener() {
    override fun onRoomJoined(switchRoomId: String?) {
        showViewerCount()
    }

    override fun onParticipantJoined(participant: Participant) {
        showViewerCount()
    }

    override fun onParticipantLeft(participant: Participant, reason: LeaveReason) {
        showViewerCount()
    }

    override fun onParticipantModeChanged(participantId: String, mode: Mode) {
        showViewerCount()
    }
}

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

    // add listener to room
    room!!.addEventListener(roomEventListener)
}

API Reference

The API references for all the methods utilized in this guide are provided below.

• participants
• mode
• onParticipantJoined()
• onParticipantLeft()
• onParticipantModeChanged()