Android Permission | ActivityResultLauncher

import android.Manifest
import android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import androidx.core.content.ContextCompat

class MainActivity : AppCompatActivity() {
    private lateinit var pLauncher: ActivityResultLauncher<Array<String>>

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

    private fun checkCameraPermission(){
        when{
            ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                    == PackageManager.PERMISSION_GRANTED ->{
                        Toast.makeText(this,"Camera run", Toast.LENGTH_LONG).show()
                    }

            else -> {
               pLauncher.launch(arrayOf(Manifest.permission.CAMERA))
            }
        }
    }

    private fun registerPermissionListener(){
        pLauncher = registerForActivityResult(
            ActivityResultContracts.RequestMultiplePermissions()){
            if(it[Manifest.permission.CAMERA] == true){
                Toast.makeText(this,"Camera run", Toast.LENGTH_LONG).show()
            } else {
                Toast.makeText(this,"Permission denied", Toast.LENGTH_LONG).show()
            }
        }
    }


}