Getting Started With CometChat Android UI Kit

AI Integration Quick Reference

Field	Value
Package	`com.cometchat:chat-uikit-android` v5.x
Init	`CometChatUIKit.init(context, UIKitSettings, callback)` — must resolve before `login()`
Login	`CometChatUIKit.login("UID", callback)` — must resolve before rendering components
Order	`init()` → `login()` → render. Breaking this order = blank screen
Auth Key	Dev/testing only. Use Auth Token in production
Theme	Set `CometChatTheme.DayNight` as parent theme in `themes.xml`
Calling	Optional. Add `com.cometchat:calls-sdk-android` to enable voice/video
Min SDK	Android 7.0 (API 24)

This guide walks you through adding CometChat to an Android app. By the end you’ll have a working chat UI.

Prerequisites

You need three things from the CometChat Dashboard:

Credential	Where to find it
App ID	Dashboard → Your App → Credentials
Auth Key	Dashboard → Your App → Credentials
Region	Dashboard → Your App → Credentials (e.g. `us`, `eu`, `in`)

You also need:

Android Studio installed
An Android emulator or physical device running Android 7.0 (API 24) or higher
Java 8 or higher
Gradle plugin 4.0.1 or later

Auth Key is for development only. In production, generate Auth Tokens server-side via the REST API and use loginWithAuthToken(). Never ship Auth Keys in client code.

Step 1 — Create an Android Project

Open Android Studio and start a new project.
Choose Empty Activity as the project template.
Enter a project name and choose Java or Kotlin as the language.
Set minimum API level to 24 or higher.

Step 2 — Install Dependencies

Add the CometChat repository and dependencies to your Gradle configuration.

Add the CometChat Repository

Add the CometChat Maven repository to your project-level settings.gradle or settings.gradle.kts file.

Kotlin
Groovy

settings.gradle.kts

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven("https://dl.cloudsmith.io/public/cometchat/cometchat/maven/")
    }
}

settings.gradle

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven{
            url "https://dl.cloudsmith.io/public/cometchat/cometchat/maven/"
        }
    }
}

Add the CometChat Dependency

Version Catalog (libs.versions.toml)
Gradle (build.gradle)

Inside libs.versions.toml, add the CometChat Chat UI Kit version under the [versions] section:

libs.versions.toml

[versions]
cometchat-ui-kit = "5.2.9"
cometchat-calls-sdk = "4.3.3"

Under the [libraries] section, define the library and reference the version:

libs.versions.toml

[libraries]
cometchat-ui-kit = { module = "com.cometchat:chat-uikit-android", version.ref = "cometchat-ui-kit" }
cometchat-calls-sdk = { module = "com.cometchat:calls-sdk-android", version.ref = "cometchat-calls-sdk" }

Now, in your app-level build.gradle.kts file, add the dependency using libs from Version Catalogs:

build.gradle.kts

dependencies {
    implementation(libs.cometchat.ui.kit)

    // (Optional) Include if using voice/video calling features
    implementation(libs.cometchat.calls.sdk)
}

Open the app level build.gradle file and add the following dependency:

build.gradle

dependencies {
    // CometChat UIKit
    implementation 'com.cometchat:chat-uikit-android:5.2.9'

    // (Optional) Include this if your app uses voice/video calling features
    implementation 'com.cometchat:calls-sdk-android:4.3.3'
}

Add AndroidX Support

The Jetifier tool helps migrate legacy support libraries to AndroidX. Open gradle.properties and verify this line is present:

gradle.properties

android.enableJetifier=true

To authenticate a user, you need a UID. You can either create users on the CometChat Dashboard, via the SDK method, or through the REST API. For development, use one of the pre-created test UIDs: cometchat-uid-1 · cometchat-uid-2 · cometchat-uid-3 · cometchat-uid-4 · cometchat-uid-5

Kotlin
Java

MainActivity.kt

import android.os.Bundle
import android.util.Log
import androidx.activity.ComponentActivity
import androidx.activity.enableEdgeToEdge
import com.cometchat.chat.core.CometChat
import com.cometchat.chat.exceptions.CometChatException
import com.cometchat.chat.models.User
import com.cometchat.chatuikit.shared.cometchatuikit.CometChatUIKit
import com.cometchat.chatuikit.shared.cometchatuikit.UIKitSettings

class MainActivity : ComponentActivity() {

    private val TAG = "MainActivity"

    private val appID = "APP_ID" // Replace with your App ID
    private val region = "REGION" // Replace with your App Region
    private val authKey = "AUTH_KEY" // Replace with your Auth Key or leave blank if you are authenticating using Auth Token

    private val uiKitSettings = UIKitSettings.UIKitSettingsBuilder()
        .setRegion(region)
        .setAppId(appID)
        .setAuthKey(authKey)
        .subscribePresenceForAllUsers()
        .build()

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

        CometChatUIKit.init(this, uiKitSettings, object : CometChat.CallbackListener<String?>() {
            override fun onSuccess(successString: String?) {

                Log.d(TAG, "Initialization completed successfully")

                loginUser()
            }

            override fun onError(e: CometChatException?) {}
        })
    }

    private fun loginUser() {
        CometChatUIKit.login("cometchat-uid-1", object : CometChat.CallbackListener<User>() {
            override fun onSuccess(user: User) {

                // Option 1: Launch One-to-One or Group Chat Screen
                // val intent = Intent(this@MainActivity, MessageActivity::class.java)
                // intent.putExtra("uid", "cometchat-uid-1")
                // startActivity(intent)

                // Option 2: Launch Conversation List + Message View (Split-Screen Style)
                // startActivity(Intent(this@MainActivity, ConversationActivity::class.java))

                // Option 3: Launch Tab-Based Chat Experience (Chats, Calls, Users, Groups)
                // startActivity(Intent(this@MainActivity, TabbedActivity::class.java))
            }

            override fun onError(e: CometChatException) {
                // Handle login failure (e.g. show error message or retry)
                Log.e("Login", "Login failed: ${e.message}")
            }
        })
    }
}

MainActivity.java

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import androidx.activity.ComponentActivity;
import com.cometchat.chat.core.CometChat;
import com.cometchat.chat.exceptions.CometChatException;
import com.cometchat.chat.models.User;
import com.cometchat.chatuikit.shared.cometchatuikit.CometChatUIKit;
import com.cometchat.chatuikit.shared.cometchatuikit.UIKitSettings;

public class MainActivity extends ComponentActivity {

    private static final String TAG = "MainActivity";

    private final String appID = "APP_ID"; // Replace with your App ID
    private final String region = "REGION"; // Replace with your App Region
    private final String authKey = "AUTH_KEY"; // Replace with your Auth Key

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setDecorFitsSystemWindows(false); // Equivalent to enableEdgeToEdge()

        UIKitSettings uiKitSettings = new UIKitSettings.UIKitSettingsBuilder()
                .setRegion(region)
                .setAppId(appID)
                .setAuthKey(authKey)
                .subscribePresenceForAllUsers()
                .build();

        CometChatUIKit.init(this, uiKitSettings, new CometChat.CallbackListener<String>() {
            @Override
            public void onSuccess(String success) {
                Log.d(TAG, "Initialization completed successfully");
                loginUser();
            }

            @Override
            public void onError(CometChatException e) {
                Log.e(TAG, "Initialization failed: " + (e != null ? e.getMessage() : "Unknown error"));
            }
        });
    }

    private void loginUser() {
        CometChatUIKit.login("cometchat-uid-1", new CometChat.CallbackListener<User>() {
            @Override
            public void onSuccess(User user) {
                Log.d(TAG, "Login successful for user: " + user.getUid());

                // Option 1: Launch One-to-One or Group Chat Screen
                // Intent intent = new Intent(MainActivity.this, MessageActivity.class);
                // intent.putExtra("uid", "cometchat-uid-1");
                // startActivity(intent);

                // Option 2: Launch Conversation List + Message View
                // startActivity(new Intent(MainActivity.this, ConversationActivity.class));

                // Option 3: Launch Tab-Based Chat Experience (Chats, Calls, Users, Groups)
                // startActivity(new Intent(MainActivity.this, TabbedActivity.class));
            }

            @Override
            public void onError(CometChatException e) {
                Log.e("Login", "Login failed: " + (e != null ? e.getMessage() : "Unknown error"));
            }
        });
    }
}

init() must resolve before you call login(). If you call login() before init completes, it will fail silently.

For production, use loginWithAuthToken() instead of Auth Key. Generate tokens server-side via the REST API.

Step 4 — Set Up Global Theme

To customize component styling across your application, set up the CometChat Theme. Use the CometChatTheme.DayNight style, which is built on Theme.MaterialComponents.DayNight.NoActionBar.

themes.xml

<style name="YourAppParentTheme" parent="CometChatTheme.DayNight"/>

AndroidManifest.xml

<application
  android:theme="@style/YourAppParentTheme"
    ...
    ...
  >

</application>

Step 5 — Choose a Chat Experience

Integrate a conversation view that suits your app’s UX. Each option below includes a description and a step-by-step guide.

Conversation List + Message View

Single-screen layout for mobile — tap a conversation to open the message view. Handles one-to-one and group conversations with real-time updates and session persistence.

Build Conversation List + Message View

Step-by-step guide to build this layout

One-to-One / Group Chat

Single chat window — no sidebar. Loads a specific user or group chat directly. Ideal for support chat, direct messages, or notification-driven flows.

Build One-to-One / Group Chat

Step-by-step guide to build this layout

Tab-Based Chat

Bottom navigation with tabs for Chats, Calls, Users, and Settings. Mobile-first, modular, and extensible for multi-feature apps.

Build Tab-Based Chat

Step-by-step guide to build this layout

Build Your Own Chat Experience

Need full control over the UI? Use individual components, customize themes, and wire up your own layouts.

Sample App

Working reference app to compare against

Components

All prebuilt UI elements with customization options

Core Features

Messaging, real-time updates, and other capabilities

Theming

Colors, fonts, dark mode, and custom styling

Build Your Own UI

Skip the UI Kit entirely and build on the raw SDK

Next Steps

Components Overview

Browse all prebuilt UI components

Theming

Customize colors, fonts, and styles

Core Features

Chat features included out of the box

Troubleshooting

Common issues and fixes

​Prerequisites

​Step 1 — Create an Android Project

​Step 2 — Install Dependencies

​Add the CometChat Repository

​Add the CometChat Dependency

​Add AndroidX Support

​Step 3 — Initialize and Login

​Step 4 — Set Up Global Theme

​Step 5 — Choose a Chat Experience

​Conversation List + Message View

Build Conversation List + Message View

​One-to-One / Group Chat

Build One-to-One / Group Chat

​Tab-Based Chat

Build Tab-Based Chat

​Build Your Own Chat Experience

Sample App

Components

Core Features

Theming

Build Your Own UI

​Next Steps

Components Overview

Theming

Core Features

Troubleshooting

Prerequisites

Step 1 — Create an Android Project

Step 2 — Install Dependencies

Add the CometChat Repository

Add the CometChat Dependency

Add AndroidX Support

Step 3 — Initialize and Login

Step 4 — Set Up Global Theme

Step 5 — Choose a Chat Experience

Conversation List + Message View

One-to-One / Group Chat

Tab-Based Chat

Build Your Own Chat Experience

Next Steps