> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-rn-guide-message-privately.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Calling Integration

> Add voice and video calling to CometChat Android UI Kit with Calls SDK installation, call listener setup, and incoming call launch.

## Overview

This guide walks you through adding voice and video calling capabilities to your Android application using the CometChat UI Kit.

<Info>
  Make sure you've completed the [Getting Started](/ui-kit/android/getting-started) guide before proceeding.
</Info>

## Add the Calls SDK

Add the CometChat Calls SDK dependency to your `build.gradle` file:

```groovy theme={null}
dependencies {
  implementation 'com.cometchat:calls-sdk-android:4.+.+'
}
```

After adding this dependency, the Android UI Kit will automatically detect it and activate the calling features. You will see [CallButtons](/ui-kit/android/call-buttons) component rendered in the [MessageHeader](/ui-kit/android/message-header) component.

<Frame>
  <img src="https://mintcdn.com/cometchat-22654f5b-docs-rn-guide-message-privately/Gp90C5sdVtuRR4t7/images/81959c4b-Calling-ee689247c8cdd512c520b85f30683ad8.png?fit=max&auto=format&n=Gp90C5sdVtuRR4t7&q=85&s=670936936a9978d89c39d3820707d3ae" width="1440" height="833" data-path="images/81959c4b-Calling-ee689247c8cdd512c520b85f30683ad8.png" />
</Frame>

## Set Up Call Listener

To receive incoming calls globally in your app, add a `CallListener` before initializing the CometChat UI Kit. We recommend creating a custom Application class:

<Tabs>
  <Tab title="Kotlin">
    ```kotlin theme={null}
    class BaseApplication : Application() {
        companion object {
            private val LISTENER_ID = "${BaseApplication::class.java.simpleName}${System.currentTimeMillis()}"
        }

        override fun onCreate() {
            super.onCreate()
            CometChat.addCallListener(LISTENER_ID, object : CometChat.CallListener {
                override fun onIncomingCallReceived(call: Call) {
                    CometChatCallActivity.launchIncomingCallScreen(this@BaseApplication, call, null)
                    // Pass null or IncomingCallConfiguration if need to configure CometChatIncomingCall component
                }

                override fun onOutgoingCallAccepted(call: Call) {
                    // Handle accepted outgoing call
                }

                override fun onOutgoingCallRejected(call: Call) {
                    // Handle rejected outgoing call
                }

                override fun onIncomingCallCancelled(call: Call) {
                    // Handle cancelled incoming call
                }
            })
        }
    }
    ```
  </Tab>

  <Tab title="Java">
    ```java theme={null}
    public class BaseApplication extends Application {

        private static String LISTENER_ID = BaseApplication.class.getSimpleName() + System.currentTimeMillis();

        @Override
        public void onCreate() {
            super.onCreate();
            CometChat.addCallListener(LISTENER_ID, new CometChat.CallListener() {
                @Override
                public void onIncomingCallReceived(Call call) {
                    CometChatCallActivity.launchIncomingCallScreen(BaseApplication.this, call, null);
                    // Pass null or IncomingCallConfiguration if need to configure CometChatIncomingCall component
                }

                @Override
                public void onOutgoingCallAccepted(Call call) {
                    // Handle accepted outgoing call
                }

                @Override
                public void onOutgoingCallRejected(Call call) {
                    // Handle rejected outgoing call
                }

                @Override
                public void onIncomingCallCancelled(Call call) {
                    // Handle cancelled incoming call
                }
            });
        }
    }
    ```
  </Tab>
</Tabs>