リアルタイムで緯度、経度を取得

前提

本日Android Studioを触り始めた初心者です。

実現したいこと

リアルタイムで緯度、経度を取得しようとしています。
書籍のサンプルコードを参考にしていますが、エラーとなり、原因がわからないので教えて頂きたいです。

発生している問題・エラーメッセージ

Cannot access '<init>': it is private in 'LocationRequest'
Unresolved reference: interval
Unresolved reference: fastestInterval
Unresolved reference: priority
Unresolved reference: PRIORITY_HIGH_ACCURACY
Unresolved reference: textView
Variable expected
Type mismatch: inferred type is android.location.LocationRequest but com.google.android.gms.location.LocationRequest! was expected

該当のソースコード

kotlin
package com.example.showtextonmapapp

import android.Manifest
import android.content.pm.PackageManager
import android.location.Location
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.WindowManager.LayoutParams.*
import android.widget.Toast
import androidx.core.app.ActivityCompat
import com.google.android.gms.location.FusedLocationProviderClient
import com.google.android.gms.location.LocationCallback
import com.google.android.gms.location.LocationResult
import com.google.android.gms.location.LocationServices

import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.gms.maps.SupportMapFragment
import com.google.android.gms.maps.model.LatLng
import android.location.LocationRequest

class MainActivity : AppCompatActivity(), OnMapReadyCallback {

    private lateinit var mMap: GoogleMap
    private val MY_PERMISSION_REQUEST_ACCESS_FINE_LOCATION = 1

    private lateinit var fusedLocationProviderClient : FusedLocationProviderClient
    private lateinit var lastLocation: Location
    private var locationCallback : LocationCallback? = null

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

        //画面をスリープにしない
        window.addFlags(FLAG_KEEP_SCREEN_ON)

        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        val mapFragment = supportFragmentManager
            .findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)
        fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this)
    }

    override fun onMapReady(googleMap: GoogleMap) {
        mMap = googleMap

        checkPermission()
    }

    private fun checkPermission() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            myLocationEnable()
        } else {
            requestLocationPermission()
        }
    }

    private fun requestLocationPermission() {
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
            //許可が拒否された場合
            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), MY_PERMISSION_REQUEST_ACCESS_FINE_LOCATION)
        } else {
            //許可も求めていない場合
            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), MY_PERMISSION_REQUEST_ACCESS_FINE_LOCATION)
        }
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        when(requestCode) {
            MY_PERMISSION_REQUEST_ACCESS_FINE_LOCATION->{
                if (permissions.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    //許可された
                    myLocationEnable()
                } else {
                    showToast("現在位置は表示できません")
                }
            }
        }
    }

    private fun myLocationEnable() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mMap.isMyLocationEnabled = true
            val locationRequest = LocationRequest().apply {
                interval = 10000
                fastestInterval = 5000
                priority = LocationRequest.PRIORITY_HIGH_ACCURACY
            }
            locationCallback = object : LocationCallback() {
                override fun onLocationResult(locationResult: LocationResult?) {
                    if (locationResult?.lastLocation != null) {
                        lastLocation = locationResult.lastLocation
                        val currentLatLng = LatLng(lastLocation.latitude, lastLocation.longitude)
                        mMap.moveCamera(CameraUpdateFactory.newLatLng(currentLatLng))
                        textView.text = "Lat:${lastLocation.latitude}, Lng:${lastLocation.longitude}"
                    }
                }
            }
            fusedLocationProviderClient.requestLocationUpdates(locationRequest, locationCallback, null)
        }
    }

    private fun showToast(msg: String) {
        val toast = Toast.makeText(this, msg, Toast.LENGTH_LONG)
        toast.show()
    }

    override fun onPause() {
        super.onPause()
        if (locationCallback != null) {
            fusedLocationProviderClient.removeLocationUpdates(locationCallback)
        }
    }

}