gistfile1.txt

class SMSReceiver : BroadcastReceiver() {

    companion object {
        private const val VALIDATE_MASK = ".*Maliava auth code:? ([0-9]{6}).*"
    }

    private var listener: WeakReference<OnSMSReceiveListener>? = null

    fun setListener(listener: OnSMSReceiveListener) {
        this.listener = listener.weak()
    }

    override fun onReceive(context: Context, intent: Intent) {
        val pudsBundle = intent.extras
        val pdus = pudsBundle.get("pdus") as Array<Any>
        val messages = SmsMessage.createFromPdu(pdus[0] as ByteArray)
        Log.i("Tag ", " received" + messages.messageBody)
        listener?.get()?.onSMSReceived(validate(messages.messageBody))
        Log.i("Tag ", " validate" + validate(messages.messageBody))
    }

    private fun validate(body: String): String? {
        if (!Pattern.compile(VALIDATE_MASK, Pattern.DOTALL).matcher(body).matches()) return null

        val p = Pattern.compile("(\\d+)")
        val m = p.matcher(body)
        var ret = ""
        while (m.find()) {
            ret += m.group()
        }
        return ret
    }
}

interface OnSMSReceiveListener {
    fun onSMSReceived(sms: String?)
}


// for fragment

val filter = IntentFilter(Telephony.Sms.Intents.SMS_RECEIVED_ACTION)


override fun onStart() {
        super.onStart()
        smsReceiver = SMSReceiver().apply { setListener(this@VerifyFragment) }
    }

    override fun onResume() {
        super.onResume()
        (activity as? AppCompatActivity)?.registerReceiver(smsReceiver, filter)
    }

    override fun onPause() {
        super.onPause()
        activity?.unregisterReceiver(smsReceiver)
    }

    override fun onDetach() {
        super.onDetach()
        smsReceiver = null
    }
    
    
    
    override fun onSMSReceived(sms: String?) {
        verifyNumberView.text?.clear()

        sms ?: return

        for (i in 0 until sms.length) {
            verifyNumberView.postDelayed({
                verifyNumberView.append(Character.toString(sms[i]))
            }, (i * 200).toLong())
        }
    }