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
1package com.example.showtextonmapapp
2
3import android.Manifest
4import android.content.pm.PackageManager
5import android.location.Location
6import androidx.appcompat.app.AppCompatActivity
7import android.os.Bundle
8import android.view.WindowManager.LayoutParams.*
9import android.widget.Toast
10import androidx.core.app.ActivityCompat
11import com.google.android.gms.location.FusedLocationProviderClient
12import com.google.android.gms.location.LocationCallback
13import com.google.android.gms.location.LocationResult
14import com.google.android.gms.location.LocationServices
15
16import com.google.android.gms.maps.CameraUpdateFactory
17import com.google.android.gms.maps.GoogleMap
18import com.google.android.gms.maps.OnMapReadyCallback
19import com.google.android.gms.maps.SupportMapFragment
20import com.google.android.gms.maps.model.LatLng
21import android.location.LocationRequest
22
23class MainActivity : AppCompatActivity(), OnMapReadyCallback {
24
25    private lateinit var mMap: GoogleMap
26    private val MY_PERMISSION_REQUEST_ACCESS_FINE_LOCATION = 1
27
28    private lateinit var fusedLocationProviderClient : FusedLocationProviderClient
29    private lateinit var lastLocation: Location
30    private var locationCallback : LocationCallback? = null
31
32    override fun onCreate(savedInstanceState: Bundle?) {
33        super.onCreate(savedInstanceState)
34        setContentView(R.layout.activity_main)
35
36        //画面をスリープにしない
37        window.addFlags(FLAG_KEEP_SCREEN_ON)
38
39        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
40        val mapFragment = supportFragmentManager
41            .findFragmentById(R.id.map) as SupportMapFragment
42        mapFragment.getMapAsync(this)
43        fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this)
44    }
45
46    override fun onMapReady(googleMap: GoogleMap) {
47        mMap = googleMap
48
49        checkPermission()
50    }
51
52    private fun checkPermission() {
53        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
54            myLocationEnable()
55        } else {
56            requestLocationPermission()
57        }
58    }
59
60    private fun requestLocationPermission() {
61        if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
62            //許可が拒否された場合
63            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), MY_PERMISSION_REQUEST_ACCESS_FINE_LOCATION)
64        } else {
65            //許可も求めていない場合
66            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), MY_PERMISSION_REQUEST_ACCESS_FINE_LOCATION)
67        }
68    }
69
70    override fun onRequestPermissionsResult(
71        requestCode: Int,
72        permissions: Array<out String>,
73        grantResults: IntArray
74    ) {
75        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
76        when(requestCode) {
77            MY_PERMISSION_REQUEST_ACCESS_FINE_LOCATION->{
78                if (permissions.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
79                    //許可された
80                    myLocationEnable()
81                } else {
82                    showToast("現在位置は表示できません")
83                }
84            }
85        }
86    }
87
88    private fun myLocationEnable() {
89        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
90            mMap.isMyLocationEnabled = true
91            val locationRequest = LocationRequest().apply {
92                interval = 10000
93                fastestInterval = 5000
94                priority = LocationRequest.PRIORITY_HIGH_ACCURACY
95            }
96            locationCallback = object : LocationCallback() {
97                override fun onLocationResult(locationResult: LocationResult?) {
98                    if (locationResult?.lastLocation != null) {
99                        lastLocation = locationResult.lastLocation
100                        val currentLatLng = LatLng(lastLocation.latitude, lastLocation.longitude)
101                        mMap.moveCamera(CameraUpdateFactory.newLatLng(currentLatLng))
102                        textView.text = "Lat:${lastLocation.latitude}, Lng:${lastLocation.longitude}"
103                    }
104                }
105            }
106            fusedLocationProviderClient.requestLocationUpdates(locationRequest, locationCallback, null)
107        }
108    }
109
110    private fun showToast(msg: String) {
111        val toast = Toast.makeText(this, msg, Toast.LENGTH_LONG)
112        toast.show()
113    }
114
115    override fun onPause() {
116        super.onPause()
117        if (locationCallback != null) {
118            fusedLocationProviderClient.removeLocationUpdates(locationCallback)
119        }
120    }
121
122}