For my Easy Permissions video tutorial

MainActivity.kt

import android.Manifest
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.fragment.app.Fragment
import com.example.testapp.databinding.FragmentFirstBinding
import com.vmadalin.easypermissions.EasyPermissions
import com.vmadalin.easypermissions.dialogs.SettingsDialog

class FirstFragment : Fragment(), EasyPermissions.PermissionCallbacks {

    companion object {
        const val PERMISSION_LOCATION_REQUEST_CODE = 1
    }

    private var _binding: FragmentFirstBinding? = null
    private val binding get() = _binding!!

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        // Inflate the layout for this fragment
        _binding = FragmentFirstBinding.inflate(inflater, container, false)

        setViewVisibility()

        binding.button.setOnClickListener {
            requestLocationPermission()
        }

        return binding.root
    }

    private fun hasLocationPermission() =
        EasyPermissions.hasPermissions(
            requireContext(),
            Manifest.permission.ACCESS_FINE_LOCATION
        )

    private fun requestLocationPermission() {
        EasyPermissions.requestPermissions(
            this,
            "This application cannot work without Location Permission.",
            PERMISSION_LOCATION_REQUEST_CODE,
            Manifest.permission.ACCESS_FINE_LOCATION
        )
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this)
    }

    override fun onPermissionsDenied(requestCode: Int, perms: List<String>) {
        if (EasyPermissions.somePermissionPermanentlyDenied(this, perms.first())) {
            SettingsDialog.Builder(requireActivity()).build().show()
        } else {
            requestLocationPermission()
        }
    }

    override fun onPermissionsGranted(requestCode: Int, perms: List<String>) {
        Toast.makeText(
            requireContext(),
            "Permission Granted!",
            Toast.LENGTH_SHORT
        ).show()
        setViewVisibility()
    }

    private fun setViewVisibility() {
        if (hasLocationPermission()) {
            binding.textView.visibility = View.VISIBLE
            binding.button.visibility = View.GONE
        } else {
            binding.textView.visibility = View.GONE
            binding.button.visibility = View.VISIBLE
        }
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }

}

You forgot to mention to enable support for view binding. I'm new to Android so it wasn't obvious to me what was goin on when the IDE didn't recognize the FragmentFirstBinding class.

https://dev.to/theimpulson/working-with-view-binding-in-android-using-kotlin-27gn