start-sms-retriever.kt

class MainActivity : AppCompatActivity() {

    private var smsReceiver: SMSReceiver? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Init Sms Retriever >>>>
        initSmsListener()
    }

    private fun initSmsListener() {
        val client = SmsRetriever.getClient(this)
        client.startSmsRetriever()
    }

    override fun onDestroy() {
        super.onDestroy()
        smsReceiver = null
}