Kotlin

Initialize the client

VoiceClient is the main class used to interact with Android client SDK. Prior to usage, you have to initialize the client by providing an instance of the Android Context class.

At the top of the MainActivity class define client property that will hold the reference to the client:

private lateinit var client: VoiceClient

Locate the onCreate method in the MainActivity class and initialize VoiceClient:

client = VoiceClient(this.application.applicationContext)
val config = VGClientConfig(ClientConfigRegion.US)
config.enableWebsocketInvites = true
client.setConfig(config)

NOTE: The enableWebsocketInvites flag on the client configuration should not be used in production. Enable push notifications to make sure you get incoming calls even when your application is in the background. See the push notifications guide for more information.

IDE will display a warning about the unresolved reference:

Put caret on the red text and press Alt + Enter to import the reference.

Now below client initialization code add the code to login the user. Please make sure to replace ALICE_JWT with the JWT you created during a previous step:

client.createSession("ALICE_JWT") {
    err, sessionId ->
    when {
        err != null -> {
            connectionStatusTextView.text = err.localizedMessage
            startCallButton.visibility = View.INVISIBLE
            endCallButton.visibility = View.INVISIBLE
        }
        else -> {
            connectionStatusTextView.text = "Connected"
            startCallButton.visibility = View.VISIBLE
            endCallButton.visibility = View.INVISIBLE
        }
    }
}

NOTE Expiry time for the token was set to 6 hours so you will need to generate a new one if it is too old.

If the session is correct started we display the start and end call buttons, otherwise we will hide these buttons and display the returned error message.