In this tutorial, you will learn how to create an Android application using kotlin and the Nexmo Android Client SDK, and then write the code to make a phone call from your Android app to another Android app. The source code is available on GitHub.

Two parts are needed to achieve this:

  • An Android application that will make the voice call and listen for incomming calls using the Client SDK.
  • A publicly accessible URL that serves instructions on how to handle the call. To accomplish this, you will create a webhook server using Node.js, Express and localtunnel.

Video tutorial

If you prefer to follow along by video, you can find this tutorial on YouTube:

Completed project

If you would like to follow along without building the app yourself, the completed project is available on Github - please see the app-to-app-kotlin folder.

This tutorial uses NexmoClient version 4.0