Custom Participant List

Customize the CometChat Calls SDK v5 participant list on Android with participant views, actions, status, and layout.

Build a custom participant list UI that displays real-time participant information with full control over layout and interactions. This guide demonstrates how to hide the default participant list and create your own using participant events and actions.

Overview

The SDK provides participant data through events, allowing you to build custom UIs for:

• Participant roster with search and filtering
• Custom participant cards with role badges or metadata
• Moderation dashboards with quick access to controls
• Attendance tracking and engagement monitoring

Prerequisites

• CometChat Calls SDK installed and initialized
• Active call session (see Join Session)
• Basic understanding of RecyclerView and adapters

---

Step 1: Hide Default Participant List

Configure session settings to hide the default participant list button:

Kotlin

val sessionSettings = CometChatCalls.SessionSettingsBuilder()
    .hideParticipantListButton(true)
    .build()

Java

SessionSettings sessionSettings = new CometChatCalls.SessionSettingsBuilder()
    .hideParticipantListButton(true)
    .build();

---

Step 2: Create Participant List Layout

Create a layout with RecyclerView for displaying participants:

activity_call.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Call View Container -->
    <FrameLayout
        android:id="@+id/callContainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- Custom Participant List Panel -->
    <LinearLayout
        android:id="@+id/participantPanel"
        android:layout_width="300dp"
        android:layout_height="match_parent"
        android:layout_alignParentEnd="true"
        android:background="#F5F5F5"
        android:orientation="vertical"
        android:padding="16dp"
        android:visibility="gone">

        <!-- Header -->
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:paddingBottom="16dp">

            <TextView
                android:id="@+id/participantCount"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Participants (0)"
                android:textColor="#000000"
                android:textSize="18sp"
                android:textStyle="bold" />

            <ImageButton
                android:id="@+id/closeButton"
                android:layout_width="32dp"
                android:layout_height="32dp"
                android:background="?attr/selectableItemBackgroundBorderless"
                android:contentDescription="Close"
                android:src="@android:drawable/ic_menu_close_clear_cancel" />
        </LinearLayout>

        <!-- Search Bar -->
        <EditText
            android:id="@+id/searchInput"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Search participants..."
            android:padding="12dp"
            android:background="@android:color/white"
            android:layout_marginBottom="16dp" />

        <!-- Participant List -->
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/participantRecyclerView"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />
    </LinearLayout>

    <!-- Toggle Button -->
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/toggleParticipantListButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_margin="16dp"
        android:contentDescription="Participants"
        android:src="@android:drawable/ic_menu_agenda" />
</RelativeLayout>

item_participant.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="12dp"
    android:background="?attr/selectableItemBackground">

    <!-- Avatar -->
    <ImageView
        android:id="@+id/participantAvatar"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginEnd="12dp"
        android:contentDescription="Avatar" />

    <!-- Info -->
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:orientation="vertical">

        <TextView
            android:id="@+id/participantName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#000000"
            android:textSize="16sp"
            android:textStyle="bold" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/statusIndicator"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="12sp"
                android:textColor="#666666" />
        </LinearLayout>
    </LinearLayout>

    <!-- Action Buttons -->
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <ImageButton
            android:id="@+id/muteButton"
            android:layout_width="32dp"
            android:layout_height="32dp"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:contentDescription="Mute"
            android:src="@android:drawable/ic_lock_silent_mode" />

        <ImageButton
            android:id="@+id/videoPauseButton"
            android:layout_width="32dp"
            android:layout_height="32dp"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:contentDescription="Pause Video"
            android:src="@android:drawable/ic_menu_camera" />

        <ImageButton
            android:id="@+id/pinButton"
            android:layout_width="32dp"
            android:layout_height="32dp"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:contentDescription="Pin"
            android:src="@android:drawable/btn_star" />
    </LinearLayout>
</LinearLayout>

---

Step 3: Create Participant Adapter

Build a RecyclerView adapter to display participant data:

Kotlin

class ParticipantAdapter(
    private val onMuteClick: (Participant) -> Unit,
    private val onPauseVideoClick: (Participant) -> Unit,
    private val onPinClick: (Participant) -> Unit
) : RecyclerView.Adapter<ParticipantAdapter.ViewHolder>() {

    private var participants = listOf<Participant>()
    private var filteredParticipants = listOf<Participant>()

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val avatar: ImageView = view.findViewById(R.id.participantAvatar)
        val name: TextView = view.findViewById(R.id.participantName)
        val status: TextView = view.findViewById(R.id.statusIndicator)
        val muteButton: ImageButton = view.findViewById(R.id.muteButton)
        val videoPauseButton: ImageButton = view.findViewById(R.id.videoPauseButton)
        val pinButton: ImageButton = view.findViewById(R.id.pinButton)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.item_participant, parent, false)
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val participant = filteredParticipants[position]

        // Set name
        holder.name.text = participant.name

        // Load avatar (use your image loading library)
        // Glide.with(holder.avatar).load(participant.avatar).into(holder.avatar)

        // Build status text
        val statusParts = mutableListOf<String>()
        if (participant.isAudioMuted) statusParts.add("🔇 Muted")
        if (participant.isVideoPaused) statusParts.add("📹 Video Off")
        if (participant.isPresenting) statusParts.add("🖥️ Presenting")
        if (participant.raisedHandTimestamp > 0) statusParts.add("✋ Hand Raised")
        if (participant.isPinned) statusParts.add("📌 Pinned")
        
        holder.status.text = if (statusParts.isEmpty()) "Active" else statusParts.joinToString(" • ")

        // Action buttons
        holder.muteButton.setOnClickListener { onMuteClick(participant) }
        holder.videoPauseButton.setOnClickListener { onPauseVideoClick(participant) }
        holder.pinButton.setOnClickListener { onPinClick(participant) }

        // Update button states
        holder.muteButton.alpha = if (participant.isAudioMuted) 0.5f else 1.0f
        holder.videoPauseButton.alpha = if (participant.isVideoPaused) 0.5f else 1.0f
        holder.pinButton.alpha = if (participant.isPinned) 1.0f else 0.5f
    }

    override fun getItemCount() = filteredParticipants.size

    fun updateParticipants(newParticipants: List<Participant>) {
        participants = newParticipants
        filteredParticipants = newParticipants
        notifyDataSetChanged()
    }

    fun filter(query: String) {
        filteredParticipants = if (query.isEmpty()) {
            participants
        } else {
            participants.filter { 
                it.name.contains(query, ignoreCase = true) 
            }
        }
        notifyDataSetChanged()
    }
}

Java

public class ParticipantAdapter extends RecyclerView.Adapter<ParticipantAdapter.ViewHolder> {

    private List<Participant> participants = new ArrayList<>();
    private List<Participant> filteredParticipants = new ArrayList<>();
    private final OnActionListener listener;

    public interface OnActionListener {
        void onMuteClick(Participant participant);
        void onPauseVideoClick(Participant participant);
        void onPinClick(Participant participant);
    }

    public ParticipantAdapter(OnActionListener listener) {
        this.listener = listener;
    }

    static class ViewHolder extends RecyclerView.ViewHolder {
        ImageView avatar;
        TextView name;
        TextView status;
        ImageButton muteButton;
        ImageButton videoPauseButton;
        ImageButton pinButton;

        ViewHolder(View view) {
            super(view);
            avatar = view.findViewById(R.id.participantAvatar);
            name = view.findViewById(R.id.participantName);
            status = view.findViewById(R.id.statusIndicator);
            muteButton = view.findViewById(R.id.muteButton);
            videoPauseButton = view.findViewById(R.id.videoPauseButton);
            pinButton = view.findViewById(R.id.pinButton);
        }
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_participant, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Participant participant = filteredParticipants.get(position);

        // Set name
        holder.name.setText(participant.getName());

        // Load avatar (use your image loading library)
        // Glide.with(holder.avatar).load(participant.getAvatar()).into(holder.avatar);

        // Build status text
        List<String> statusParts = new ArrayList<>();
        if (participant.isAudioMuted()) statusParts.add("🔇 Muted");
        if (participant.isVideoPaused()) statusParts.add("📹 Video Off");
        if (participant.isPresenting()) statusParts.add("🖥️ Presenting");
        if (participant.getRaisedHandTimestamp() > 0) statusParts.add("✋ Hand Raised");
        if (participant.isPinned()) statusParts.add("📌 Pinned");

        holder.status.setText(statusParts.isEmpty() ? "Active" : String.join(" • ", statusParts));

        // Action buttons
        holder.muteButton.setOnClickListener(v -> listener.onMuteClick(participant));
        holder.videoPauseButton.setOnClickListener(v -> listener.onPauseVideoClick(participant));
        holder.pinButton.setOnClickListener(v -> listener.onPinClick(participant));

        // Update button states
        holder.muteButton.setAlpha(participant.isAudioMuted() ? 0.5f : 1.0f);
        holder.videoPauseButton.setAlpha(participant.isVideoPaused() ? 0.5f : 1.0f);
        holder.pinButton.setAlpha(participant.isPinned() ? 1.0f : 0.5f);
    }

    @Override
    public int getItemCount() {
        return filteredParticipants.size();
    }

    public void updateParticipants(List<Participant> newParticipants) {
        participants = new ArrayList<>(newParticipants);
        filteredParticipants = new ArrayList<>(newParticipants);
        notifyDataSetChanged();
    }

    public void filter(String query) {
        if (query.isEmpty()) {
            filteredParticipants = new ArrayList<>(participants);
        } else {
            filteredParticipants = new ArrayList<>();
            for (Participant p : participants) {
                if (p.getName().toLowerCase().contains(query.toLowerCase())) {
                    filteredParticipants.add(p);
                }
            }
        }
        notifyDataSetChanged();
    }
}

---

Step 4: Implement Participant Events

Listen for participant updates and handle actions in your Activity:

Kotlin

class CallActivity : AppCompatActivity() {

    private lateinit var participantAdapter: ParticipantAdapter
    private lateinit var callSession: CallSession
    private var isParticipantPanelVisible = false

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_call)

        callSession = CallSession.getInstance()

        // Setup RecyclerView
        val recyclerView = findViewById<RecyclerView>(R.id.participantRecyclerView)
        recyclerView.layoutManager = LinearLayoutManager(this)
        
        participantAdapter = ParticipantAdapter(
            onMuteClick = { participant ->
                callSession.muteParticipant(participant.uid)
            },
            onPauseVideoClick = { participant ->
                callSession.pauseParticipantVideo(participant.uid)
            },
            onPinClick = { participant ->
                if (participant.isPinned) {
                    callSession.unPinParticipant()
                } else {
                    callSession.pinParticipant(participant.uid)
                }
            }
        )
        recyclerView.adapter = participantAdapter

        // Setup search
        val searchInput = findViewById<EditText>(R.id.searchInput)
        searchInput.addTextChangedListener(object : TextWatcher {
            override fun afterTextChanged(s: Editable?) {
                participantAdapter.filter(s.toString())
            }
            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}
        })

        // Setup toggle button
        findViewById<FloatingActionButton>(R.id.toggleParticipantListButton).setOnClickListener {
            toggleParticipantPanel()
        }

        // Setup close button
        findViewById<ImageButton>(R.id.closeButton).setOnClickListener {
            toggleParticipantPanel()
        }

        // Listen for participant events
        setupParticipantListener()
    }

    private fun setupParticipantListener() {
        callSession.addParticipantEventListener(this, object : ParticipantEventListener() {
            override fun onParticipantListChanged(participants: List<Participant>) {
                runOnUiThread {
                    participantAdapter.updateParticipants(participants)
                    updateParticipantCount(participants.size)
                }
            }

            override fun onParticipantJoined(participant: Participant) {
                Log.d(TAG, "${participant.name} joined")
            }

            override fun onParticipantLeft(participant: Participant) {
                Log.d(TAG, "${participant.name} left")
            }

            override fun onParticipantAudioMuted(participant: Participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            override fun onParticipantAudioUnmuted(participant: Participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            override fun onParticipantVideoPaused(participant: Participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            override fun onParticipantVideoResumed(participant: Participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            override fun onParticipantHandRaised(participant: Participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            override fun onParticipantHandLowered(participant: Participant) {
                // Adapter will update automatically via onParticipantListChanged
            }
        })
    }

    private fun toggleParticipantPanel() {
        val panel = findViewById<LinearLayout>(R.id.participantPanel)
        isParticipantPanelVisible = !isParticipantPanelVisible
        panel.visibility = if (isParticipantPanelVisible) View.VISIBLE else View.GONE
    }

    private fun updateParticipantCount(count: Int) {
        findViewById<TextView>(R.id.participantCount).text = "Participants ($count)"
    }

    companion object {
        private const val TAG = "CallActivity"
    }
}

Java

public class CallActivity extends AppCompatActivity {

    private ParticipantAdapter participantAdapter;
    private CallSession callSession;
    private boolean isParticipantPanelVisible = false;
    private static final String TAG = "CallActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_call);

        callSession = CallSession.getInstance();

        // Setup RecyclerView
        RecyclerView recyclerView = findViewById(R.id.participantRecyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        participantAdapter = new ParticipantAdapter(new ParticipantAdapter.OnActionListener() {
            @Override
            public void onMuteClick(Participant participant) {
                callSession.muteParticipant(participant.getUid());
            }

            @Override
            public void onPauseVideoClick(Participant participant) {
                callSession.pauseParticipantVideo(participant.getUid());
            }

            @Override
            public void onPinClick(Participant participant) {
                if (participant.isPinned()) {
                    callSession.unPinParticipant();
                } else {
                    callSession.pinParticipant(participant.getUid());
                }
            }
        });
        recyclerView.setAdapter(participantAdapter);

        // Setup search
        EditText searchInput = findViewById(R.id.searchInput);
        searchInput.addTextChangedListener(new TextWatcher() {
            @Override
            public void afterTextChanged(Editable s) {
                participantAdapter.filter(s.toString());
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {}
        });

        // Setup toggle button
        findViewById(R.id.toggleParticipantListButton).setOnClickListener(v -> toggleParticipantPanel());

        // Setup close button
        findViewById(R.id.closeButton).setOnClickListener(v -> toggleParticipantPanel());

        // Listen for participant events
        setupParticipantListener();
    }

    private void setupParticipantListener() {
        callSession.addParticipantEventListener(this, new ParticipantEventListener() {
            @Override
            public void onParticipantListChanged(List<Participant> participants) {
                runOnUiThread(() -> {
                    participantAdapter.updateParticipants(participants);
                    updateParticipantCount(participants.size());
                });
            }

            @Override
            public void onParticipantJoined(Participant participant) {
                Log.d(TAG, participant.getName() + " joined");
            }

            @Override
            public void onParticipantLeft(Participant participant) {
                Log.d(TAG, participant.getName() + " left");
            }

            @Override
            public void onParticipantAudioMuted(Participant participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            @Override
            public void onParticipantAudioUnmuted(Participant participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            @Override
            public void onParticipantVideoPaused(Participant participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            @Override
            public void onParticipantVideoResumed(Participant participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            @Override
            public void onParticipantHandRaised(Participant participant) {
                // Adapter will update automatically via onParticipantListChanged
            }

            @Override
            public void onParticipantHandLowered(Participant participant) {
                // Adapter will update automatically via onParticipantListChanged
            }
        });
    }

    private void toggleParticipantPanel() {
        LinearLayout panel = findViewById(R.id.participantPanel);
        isParticipantPanelVisible = !isParticipantPanelVisible;
        panel.setVisibility(isParticipantPanelVisible ? View.VISIBLE : View.GONE);
    }

    private void updateParticipantCount(int count) {
        TextView countView = findViewById(R.id.participantCount);
        countView.setText("Participants (" + count + ")");
    }
}

---

Complete Example

Here’s the full implementation with all components:

Kotlin

class CallActivity : AppCompatActivity() {

    private lateinit var participantAdapter: ParticipantAdapter
    private lateinit var callSession: CallSession
    private var isParticipantPanelVisible = false

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_call)

        callSession = CallSession.getInstance()
        setupUI()
        setupParticipantListener()
        joinCall()
    }

    private fun setupUI() {
        // Setup RecyclerView
        val recyclerView = findViewById<RecyclerView>(R.id.participantRecyclerView)
        recyclerView.layoutManager = LinearLayoutManager(this)
        
        participantAdapter = ParticipantAdapter(
            onMuteClick = { callSession.muteParticipant(it.uid) },
            onPauseVideoClick = { callSession.pauseParticipantVideo(it.uid) },
            onPinClick = { 
                if (it.isPinned) callSession.unPinParticipant() 
                else callSession.pinParticipant(it.uid)
            }
        )
        recyclerView.adapter = participantAdapter

        // Setup search
        findViewById<EditText>(R.id.searchInput).addTextChangedListener(object : TextWatcher {
            override fun afterTextChanged(s: Editable?) {
                participantAdapter.filter(s.toString())
            }
            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}
        })

        // Setup buttons
        findViewById<FloatingActionButton>(R.id.toggleParticipantListButton)
            .setOnClickListener { toggleParticipantPanel() }
        findViewById<ImageButton>(R.id.closeButton)
            .setOnClickListener { toggleParticipantPanel() }
    }

    private fun setupParticipantListener() {
        callSession.addParticipantEventListener(this, object : ParticipantEventListener() {
            override fun onParticipantListChanged(participants: List<Participant>) {
                runOnUiThread {
                    participantAdapter.updateParticipants(participants)
                    findViewById<TextView>(R.id.participantCount).text = 
                        "Participants (${participants.size})"
                }
            }

            override fun onParticipantJoined(participant: Participant) {
                Toast.makeText(this@CallActivity, 
                    "${participant.name} joined", Toast.LENGTH_SHORT).show()
            }

            override fun onParticipantLeft(participant: Participant) {
                Toast.makeText(this@CallActivity, 
                    "${participant.name} left", Toast.LENGTH_SHORT).show()
            }
        })
    }

    private fun joinCall() {
        val sessionSettings = CometChatCalls.SessionSettingsBuilder()
            .hideParticipantListButton(true)
            .setTitle("Team Meeting")
            .build()

        val callContainer = findViewById<FrameLayout>(R.id.callContainer)

        CometChatCalls.joinSession(
            sessionId = "SESSION_ID",
            sessionSettings = sessionSettings,
            view = callContainer,
            context = this,
            listener = object : CometChatCalls.CallbackListener<Void>() {
                override fun onSuccess(p0: Void?) {
                    Log.d(TAG, "Joined call successfully")
                }

                override fun onError(exception: CometChatException) {
                    Log.e(TAG, "Failed to join: ${exception.message}")
                    Toast.makeText(this@CallActivity, 
                        "Failed to join call", Toast.LENGTH_SHORT).show()
                }
            }
        )
    }

    private fun toggleParticipantPanel() {
        val panel = findViewById<LinearLayout>(R.id.participantPanel)
        isParticipantPanelVisible = !isParticipantPanelVisible
        panel.visibility = if (isParticipantPanelVisible) View.VISIBLE else View.GONE
    }

    companion object {
        private const val TAG = "CallActivity"
    }
}

Java

public class CallActivity extends AppCompatActivity {

    private ParticipantAdapter participantAdapter;
    private CallSession callSession;
    private boolean isParticipantPanelVisible = false;
    private static final String TAG = "CallActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_call);

        callSession = CallSession.getInstance();
        setupUI();
        setupParticipantListener();
        joinCall();
    }

    private void setupUI() {
        // Setup RecyclerView
        RecyclerView recyclerView = findViewById(R.id.participantRecyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        participantAdapter = new ParticipantAdapter(new ParticipantAdapter.OnActionListener() {
            @Override
            public void onMuteClick(Participant participant) {
                callSession.muteParticipant(participant.getUid());
            }

            @Override
            public void onPauseVideoClick(Participant participant) {
                callSession.pauseParticipantVideo(participant.getUid());
            }

            @Override
            public void onPinClick(Participant participant) {
                if (participant.isPinned()) {
                    callSession.unPinParticipant();
                } else {
                    callSession.pinParticipant(participant.getUid());
                }
            }
        });
        recyclerView.setAdapter(participantAdapter);

        // Setup search
        EditText searchInput = findViewById(R.id.searchInput);
        searchInput.addTextChangedListener(new TextWatcher() {
            @Override
            public void afterTextChanged(Editable s) {
                participantAdapter.filter(s.toString());
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {}
        });

        // Setup buttons
        findViewById(R.id.toggleParticipantListButton).setOnClickListener(v -> 
            toggleParticipantPanel());
        findViewById(R.id.closeButton).setOnClickListener(v -> 
            toggleParticipantPanel());
    }

    private void setupParticipantListener() {
        callSession.addParticipantEventListener(this, new ParticipantEventListener() {
            @Override
            public void onParticipantListChanged(List<Participant> participants) {
                runOnUiThread(() -> {
                    participantAdapter.updateParticipants(participants);
                    TextView countView = findViewById(R.id.participantCount);
                    countView.setText("Participants (" + participants.size() + ")");
                });
            }

            @Override
            public void onParticipantJoined(Participant participant) {
                Toast.makeText(CallActivity.this, 
                    participant.getName() + " joined", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onParticipantLeft(Participant participant) {
                Toast.makeText(CallActivity.this, 
                    participant.getName() + " left", Toast.LENGTH_SHORT).show();
            }
        });
    }

    private void joinCall() {
        SessionSettings sessionSettings = new CometChatCalls.SessionSettingsBuilder()
                .hideParticipantListButton(true)
                .setTitle("Team Meeting")
                .build();

        FrameLayout callContainer = findViewById(R.id.callContainer);

        CometChatCalls.joinSession(
                "SESSION_ID",
                sessionSettings,
                callContainer,
                this,
                new CometChatCalls.CallbackListener<Void>() {
                    @Override
                    public void onSuccess(Void unused) {
                        Log.d(TAG, "Joined call successfully");
                    }

                    @Override
                    public void onError(CometChatException e) {
                        Log.e(TAG, "Failed to join: " + e.getMessage());
                        Toast.makeText(CallActivity.this, 
                            "Failed to join call", Toast.LENGTH_SHORT).show();
                    }
                }
        );
    }

    private void toggleParticipantPanel() {
        LinearLayout panel = findViewById(R.id.participantPanel);
        isParticipantPanelVisible = !isParticipantPanelVisible;
        panel.setVisibility(isParticipantPanelVisible ? View.VISIBLE : View.GONE);
    }
}

Participant Object Reference

Property	Type	Description
uid	String	Unique identifier (CometChat user ID)
name	String	Display name
avatar	String	URL of avatar image
pid	String	Participant ID for this call session
role	String	Role in the call
audioMuted	Boolean	Whether audio is muted
videoPaused	Boolean	Whether video is paused
isPinned	Boolean	Whether pinned in layout
isPresenting	Boolean	Whether screen sharing
raisedHandTimestamp	Long	Timestamp when hand was raised (0 if not raised)