Detect incoming call in android using kotlin not working

Question

could not find any reference on using kotlin to detect incoming call using BroadcastReceiver created dynamically. most java program add intent in the manifest. I wanted to use Broadcastreciever in the specific activity. I used below code but not working. Can anyone help?

Problem:
1. How to set up the Intent Filter for the Phone_State

class MainActivity : AppCompatActivity() {

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


    val broadCastReceiver = object : BroadcastReceiver() {

        override fun onReceive(contxt: Context?, intent: Intent?) {

            try {
                println("Receiver start")

                val state = intent!!.getStringExtra(TelephonyManager.EXTRA_STATE)
                val incomingNumber =
                    intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER)
                if (state == TelephonyManager.EXTRA_STATE_RINGING) {
                    Toast.makeText(applicationContext, "Incoming Call State", Toast.LENGTH_SHORT).show()
                    Toast.makeText(applicationContext,
                        "Ringing State Number is -$incomingNumber",
                        Toast.LENGTH_SHORT
                    ).show()
                }
                if (state == TelephonyManager.EXTRA_STATE_OFFHOOK) {
                    Toast.makeText(applicationContext, "Call Received State", Toast.LENGTH_SHORT).show()
                }
                if (state == TelephonyManager.EXTRA_STATE_IDLE) {
                    Toast.makeText(applicationContext, "Call Idle State", Toast.LENGTH_SHORT).show()
                }
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }
    }

    // Set When broadcast event will fire.
    val filter = IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED)
    LocalBroadcastManager.getInstance(this).registerReceiver(broadCastReceiver, filter) 

} }