How to Add the Nexmo Client SDK to your Android App

This tutorial shows you how to add the Nexmo Client SDK to your Android app.


The Nexmo Client SDK requires a minumum Android API level of 16.

To add the Nexmo Client SDK to your project

Open you Android project

Open your Android project codebase in your IDE.

Add dependencies

To add the Nexmo Client SDK dependencies to your project use the following procedure:

  1. In your app level build.gradle file (usually app/build.gradle), add the dependency:

    dependencies {
        implementation ''
  2. In your project level build.gradle file, add the Maven repository:

    buildscript {
        repositories {
            maven {
                url ""
    allprojects {
        repositories {
            maven {
                url ""

Add permissions

To use the In-App Voice features, add audio permissions using the following procedure:

  1. On your AndroidManifest.xml add the required permissions:

    <manifest ...>
        <uses-permission android:name="android.permission.INTERNET" />
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
        <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
        <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
        <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
        <uses-permission android:name="android.permission.RECORD_AUDIO" />
        <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
        <uses-permission android:name="android.permission.READ_PHONE_STATE" />
  2. For devices running Android version M (API level 23) or higher, you should add a request for the permissions required:

    android.Manifest.permission.READ_PHONE_STATE, android.Manifest.permission.RECORD_AUDIO, android.Manifest.permission.PROCESS_OUTGOING_CALLS

    Read more about requesting runtime permissions on Android here

Using NexmoClient in your App

Init NexmoClient

Before being able to use a NexmoClient instance, you need to initialize it:

loginListener = object : NexmoLoginListener {
    override fun onLoginStateChange(eLoginState: NexmoLoginListener.ELoginState, eLoginStateReason: NexmoLoginListener.ELoginStateReason) {

    override fun onAvailabilityChange(eAvailability: NexmoLoginListener.EAvailability, nexmoConnectionState: NexmoConnectionState) {

NexmoClient.init(context, loginListener)

Login NexmoClient

After initializing NexmoClient, you need log in to it, using a jwt user token. This is described in the topic on JWTs and ACLs.

Replace the token so as to authenticate the relevant user:

    NexmoClient.get().login(token, loginListener)

After the login succeeds, the logged in user is available via NexmoClient.get().getUser().


You added the Nexmo Client SDK to your Android app, initialized it, and logged in to a NexmoClient instance.

You can now use NexmoClient.get() in your app, and then use additional NexmoClient functionality.