Kotlin SMS Demo

package blackwell.testapp

import android.Manifest
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.EditText
import android.content.Intent
import android.telephony.SmsManager
import android.widget.Toast
import android.content.IntentFilter
import android.app.Activity
import android.app.PendingIntent.getBroadcast
import android.content.BroadcastReceiver
import android.content.Context
import android.support.v4.app.ActivityCompat




class MainActivity : AppCompatActivity() {

    val SEND_SMS = 101

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

        ActivityCompat.requestPermissions(this, arrayOf<String>(Manifest.permission.SEND_SMS), SEND_SMS)

        val sendButton = findViewById(R.id.send_btn)
        val textMessage = findViewById(R.id.msg) as EditText
        val phoneNumber = findViewById(R.id.phone_no) as EditText

        sendButton.setOnClickListener {
            if (!phoneNumber.text.isBlank()) {
                if(!textMessage.text.isBlank()) {
                    sendSMS(phoneNumber.text.toString(), textMessage.text.toString())
                    textMessage.text.clear()
                    textMessage.error = null
                    phoneNumber.error = null
                } else {
                    textMessage.error = "Cannot leave message blank"
                }
            } else {
                phoneNumber.error = "Enter A Phone #"
            }
        }

    }

    private fun sendSMS(phoneNumber: String, message: String) {
        val SENT = "SMS_SENT"
        val DELIVERED = "SMS_DELIVERED"

        val sentPI = getBroadcast(this, 0,
                Intent(SENT), 0)

        val deliveredPI = getBroadcast(this, 0,
                Intent(DELIVERED), 0)

        registerReceiver(object : BroadcastReceiver() {
            override fun onReceive(arg0: Context, arg1: Intent) {
                when (resultCode) {
                    Activity.RESULT_OK -> Toast.makeText(baseContext, "SMS delivered",
                            Toast.LENGTH_SHORT).show()
                    Activity.RESULT_CANCELED -> Toast.makeText(baseContext, "SMS not delivered",
                            Toast.LENGTH_SHORT).show()
                }
            }
        }, IntentFilter(DELIVERED))

        val sms = SmsManager.getDefault()
        sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI)
    }
}