event-listeners

name	event-listeners
description	Register all five call event listeners — SessionStatusListener, ParticipantEventListener, MediaEventsListener, ButtonClickListener, LayoutListener. Use when handling call events, session status, participant changes, media state, button clicks, or layout changes. Triggers on "event listener", "session listener", "participant listener", "media listener", "button click", "layout listener".
inclusion	manual

CometChat Calls SDK v5 — Event Listeners

Overview

Five lifecycle-aware listeners monitor call events. All are registered on CallSession.getInstance() and auto-removed when the LifecycleOwner (Activity/Fragment) is destroyed.

Key Imports

import com.cometchat.calls.core.CallSession
import com.cometchat.calls.listeners.SessionStatusListener
import com.cometchat.calls.listeners.ParticipantEventListener
import com.cometchat.calls.listeners.MediaEventsListener
import com.cometchat.calls.listeners.ButtonClickListener
import com.cometchat.calls.listeners.LayoutListener
import com.cometchat.calls.model.Participant
import com.cometchat.calls.model.AudioMode
import com.cometchat.calls.model.CameraFacing
import com.cometchat.calls.model.LayoutType

Implementation

1. SessionStatusListener

val callSession = CallSession.getInstance()

callSession.addSessionStatusListener(this, object : SessionStatusListener() {
    override fun onSessionJoined() { /* connected */ }
    override fun onSessionLeft() { finish() }
    override fun onSessionTimedOut() { finish() }
    override fun onConnectionLost() { /* show reconnecting UI */ }
    override fun onConnectionRestored() { /* hide reconnecting UI */ }
    override fun onConnectionClosed() { finish() }
})

2. ParticipantEventListener

callSession.addParticipantEventListener(this, object : ParticipantEventListener() {
    override fun onParticipantJoined(participant: Participant) {}
    override fun onParticipantLeft(participant: Participant) {}
    override fun onParticipantListChanged(participants: List<Participant>) {}
    override fun onParticipantAudioMuted(participant: Participant) {}
    override fun onParticipantAudioUnmuted(participant: Participant) {}
    override fun onParticipantVideoPaused(participant: Participant) {}
    override fun onParticipantVideoResumed(participant: Participant) {}
    override fun onParticipantHandRaised(participant: Participant) {}
    override fun onParticipantHandLowered {}
      {}
      {}
      {}
      {}
      {}
})

3. MediaEventsListener

callSession.addMediaEventsListener(this, object : MediaEventsListener() {
    override fun onAudioMuted() {}
    override fun onAudioUnMuted() {}
    override fun onVideoPaused() {}
    override fun onVideoResumed() {}
    override fun onRecordingStarted() {}
    override fun onRecordingStopped() {}
    override fun onAudioModeChanged(audioMode: AudioMode) {}
    override fun onCameraFacingChanged(facing: CameraFacing) {}
})

4. ButtonClickListener

callSession.addButtonClickListener(this, object : ButtonClickListener() {
    override fun onLeaveSessionButtonClicked() {}
    override fun onToggleAudioButtonClicked() {}
    override fun onToggleVideoButtonClicked() {}
    override fun onSwitchCameraButtonClicked() {}
    override fun onRaiseHandButtonClicked() {}
    override fun onShareInviteButtonClicked() {}
    override fun onChangeLayoutButtonClicked() {}
    override fun onParticipantListButtonClicked() {}
    override fun onChatButtonClicked() {}
    override fun onRecordingToggleButtonClicked() {}
})

5. LayoutListener

callSession.addLayoutListener(this, object : LayoutListener() {
    override fun onCallLayoutChanged(layoutType: LayoutType) {}
    override fun onParticipantListVisible() {}
    override fun onParticipantListHidden() {}
    override fun onPictureInPictureLayoutEnabled() {}
    override fun onPictureInPictureLayoutDisabled() {}
})

Gotchas

• All listeners are lifecycle-aware — no manual removal needed
• Pass this (Activity/Fragment) as the first argument for lifecycle binding
• Register listeners after joinSession() succeeds (in the onSuccess callback)
• Button click events fire before the SDK's default action
• Participant object has: uid, name, avatar, isAudioMuted, isVideoPaused, isPresenting, isPinned, raisedHandTimestamp, pid, role
• Use runOnUiThread {} for UI updates inside listener callbacks

Sample App Reference

• CallActivity.kt — setupCallListeners() registers SessionStatusListener and ButtonClickListener