Android Kotlin UI Kit

Learn a quick integration of text chat and voice/video calling features for your application

The CometChat Android Kotlin UI Kit is developed to keep developers in mind and aims to reduce development efforts significantly.


Improvements in V3.0

Faster connection & response times
Higher rate limits
Supports up to 100K users in a group
Unlimited groups
Support for Transient Messages
Real-time user & group members count
And more!

The UI Kit’s customizable UI components simplify the process of integrating text chat and voice/video calling features to your website or mobile application in a few minutes.

I want to checkout Android Kotlin UI Kit.

Follow the steps mentioned in the file.

Kindly, click on below button to download our Android Kotlin Chat UI Kit.

Android Kotlin Chat UI Kit

View on Github

I want to explore sample apps.

Import the app into Android Studio and follow the steps mentioned in the file.

Kindly, click on below button to download our Android Kotlin Sample App.

Android Kotlin Sample App

View on Github

Installation steps

Prerequisites :star:

Before you begin, ensure you have met the following requirements:
✅ You have Android Studio installed on your machine.
✅ You have an Android Device or Emulator with Android Version 6.0 or above.
✅ You have read CometChat Key Concepts.

Installing Android Kotlin Chat UI Kit

Setup :wrench:

To install Android Kotlin UI Kit, you need to first register on CometChat Dashboard. Click here to sign up.

i. Get your Application Keys :key:

  1. Create a new app



Please follow the steps provided in the Key concepts guide to create V3 apps before you proceed.

  1. Head over to the Quick Start or API & Auth Keys section and note the App ID, Auth Key, and Region.

ii. Add the CometChat Dependency

First, add the repository URL to the project level build.gradle file in the repositories block under the allprojects section.

allprojects {
  repositories {
    maven {
      url ""

Open the app level build.gradle file and

  1. Add the below two line in the dependencies section.
dependencies {
  implementation 'com.cometchat:pro-android-chat-sdk:3.0.0'
  implementation 'com.cometchat:pro-android-calls-sdk:2.1.0'
  1. Add the below lines android section
android {
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8

Configure CometChat inside your app

i. Initialize CometChat 🌟

The init() method initializes the settings required for CometChat. We suggest calling the init() method on app startup, preferably in the onCreate() method of the Application class.

private val appID = "APP_ID"
private val region = "REGION"
val appSettings = AppSettingsBuilder().subscribePresenceForAllUsers().setRegion(region).build()
CometChat.init(this, appID, appSettings, object : CallbackListener<String>() {
    override fun onSuccess(successMessage: String) {
        Log.d(TAG, "Initialization completed successfully")

    override fun onError(e: CometChatException) {
         Log.d(TAG, "Initialization failed with exception: "+e.message)



Make sure you replace the APP_ID with your CometChat APP ID and REGION with your app's REGION in the above code.

ii. Login User 👤

The login() method returns the User object containing all the information of the logged-in user.

private val UID = "SUPERHERO1" // Replace with the UID of the user to login
private val AUTH_KEY = "Enter AUTH_KEY" // Replace with your App Auth Key
CometChat.login(UID, AUTH_KEY, object : CallbackListener<User?>() {
    override fun onSuccess(user: User?) {
        Log.d(TAG, "Login Successful : "+user.toString())

    override fun onError(e: CometChatException) {
        Log.d(TAG, "Login failed with exception: " + e.message);



  • Make sure you replace the AUTH_KEY with your CometChat AUTH Key in the above code.
  • We have setup 5 users for testing having UIDs: SUPERHERO1, SUPERHERO2, SUPERHERO3, SUPERHERO4 and SUPERHERO5.

Add the UI Kit Library

To integrate the UI Kit, please follow the steps below:

  1. Clone the UI Kit-Kotlin Library from the android-kotlin-chat-ui-kit repository
  1. Import uikit-kotlin Module from Module Settings. ( To know how to import uikit-kotlin as Module visit this link )

  2. If the Library is added successfully, it will look like mentioned in the below image.

Configure UI Kit Library


Enable dataBinding

As the UI Kit uses dataBinding you must enable dataBinding

To configure your app to use data binding, add the dataBinding element to your build.gradle file in the app module, as shown in the following example:

android {
    dataBinding {
        enabled = true

We are using File Provider for storage & file access. So you need to add your application package name in manifestPlaceholders

android {
    defaultConfig {
        manifestPlaceholders = [file_provider: "YOUR_PACKAGE_NAME"] 
        //add your application package.


Add Theme.MaterialComponents

As UI Kit is using material components your app's theme should extend Theme.MaterialComponents. Follow the guide at Getting started with Material Components.

Make sure you add the below dependency to your app-level build.gradle file

dependencies {
  implementation ''

The following is the list of Material Components themes you can use to get the latest component styles and theme-level attributes.


Update your app theme to inherit from one of these themes, e.g.:

<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar.Bridge">
    <!-- Customize your theme here. -->


Launch CometChatUI :rocket:

CometChatUI is an option to launch a fully functional chat application using the UI Kit. In UI Kit all the UI Components are interlinked and work together to launch a fully functional chat on your mobile/application.

To use CometChatUI user has to launch CometChatUI Activity. Add the following code snippet to launch CometChatUI.

startActivity(Intent([email protected],

What’s Next
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