class MySMSBroadcastReceiver : BroadcastReceiver() {

    private var otpReceiver: OTPReceiveListener? = null

    /**
     * @param receiver OTPReceiveListener
     */
    fun initOTPListener(receiver: OTPReceiveListener) {
        this.otpReceiver = receiver
    }

    override fun onReceive(context: Context, intent: Intent) {
        if (SmsRetriever.SMS_RETRIEVED_ACTION == intent.action) {
            val extras : Bundle = intent.extras
            val status : Status? = extras.get(SmsRetriever.EXTRA_STATUS) as? Status

            when (status?.statusCode) {
                CommonStatusCodes.SUCCESS -> {
                    // Get SMS message contents
                    val otp : String? = extras.get(SmsRetriever.EXTRA_SMS_MESSAGE) as? String

                    // Extract one-time code from the message and complete verification
                    // by sending the code back to your server for SMS authenticity.
                    // But here we are just passing it to MainActivity
                    otpReceiver?.let { otpReceiveListener ->
                        otp?.let {otp ->
                            otpReceiveListener.onOTPReceived(otp.replace("<#> Your ExampleApp code is: ", "").split("\n".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()[0])
                        }
                    }
                }

                CommonStatusCodes.TIMEOUT ->
                    // Waiting for SMS timed out (5 minutes)
                    // Handle the error ...
                    otpReceiver?.onOTPTimeOut()
            }
        }
    }

    /**
     *  Listener for Received OTP
     */
    interface OTPReceiveListener {
        /**
         * @param otp String
         */
        fun onOTPReceived(otp: String)

        /**
         *  Time Out
         */
        fun onOTPTimeOut()
    }
}