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MainActivity.kt 파일의 전체 코드는 아래를 참조하십시오.

파일명 : MainActivity.kt

package kr.co.leelab.locationtest

import android.Manifest
import android.app.AlertDialog
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.location.Location
import android.location.LocationManager
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Looper
import android.provider.Settings
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import androidx.core.app.ActivityCompat
import com.google.android.gms.location.*
import java.text.SimpleDateFormat
import java.util.*

class MainActivity : AppCompatActivity() {
    private var mFusedLocationProviderClient: FusedLocationProviderClient? = null
    private val INTERVAL: Long = 2000
    private val FASTEST_INTERVAL: Long = 1000
    lateinit var mLastLocation: Location
    internal lateinit var mLocationRequest: LocationRequest
    private val REQUEST_PERMISSION_LOCATION = 10

    lateinit var btnStartupdate: Button
    lateinit var btnStopUpdates: Button
    lateinit var txtLat: TextView
    lateinit var txtLong: TextView
    lateinit var txtTime: TextView

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

        mLocationRequest = LocationRequest()

        btnStartupdate = findViewById(R.id.btn_start_upds)
        btnStopUpdates = findViewById(R.id.btn_stop_upds)
        txtLat = findViewById(R.id.txtLat);
        txtLong = findViewById(R.id.txtLong);
        txtTime = findViewById(R.id.txtTime);

        val locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager
        if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            buildAlertMessageNoGps()
        }


        btnStartupdate.setOnClickListener {
            if (checkPermissionForLocation(this)) {
                startLocationUpdates()
                btnStartupdate.isEnabled = false
                btnStopUpdates.isEnabled = true
            }
        }

        btnStopUpdates.setOnClickListener {
            stoplocationUpdates()
            txtTime.text = "Updates Stoped"
            btnStartupdate.isEnabled = true
            btnStopUpdates.isEnabled = false
        }

    }

    fun checkPermissionForLocation(context: Context): Boolean {
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

            if (context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) ==
                    PackageManager.PERMISSION_GRANTED){
                true
            }else{
                // Show the permission request
                ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION),
                        REQUEST_PERMISSION_LOCATION)
                false
            }
        } else {
            true
        }
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == REQUEST_PERMISSION_LOCATION) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                //We have to add startlocationUpdate() method later instead of Toast
                Toast.makeText(this,"Permission granted",Toast.LENGTH_SHORT).show()
            }
        }
    }

    private fun buildAlertMessageNoGps() {

        val builder = AlertDialog.Builder(this)
        builder.setMessage("Your GPS seems to be disabled, do you want to enable it?")
                .setCancelable(false)
                .setPositiveButton("Yes") { dialog, id ->
                    startActivityForResult(
                            Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)
                            , 11)
                }
                .setNegativeButton("No") { dialog, id ->
                    dialog.cancel()
                    finish()
                }
        val alert: AlertDialog  = builder.create()
        alert.show()

    }

    private val mLocationCallback = object : LocationCallback() {
        override fun onLocationResult(locationResult: LocationResult) {
            // do work here
            locationResult.lastLocation
            onLocationChanged(locationResult.lastLocation)
        }
    }

    fun onLocationChanged(location: Location) {
        // New location has now been determined

        mLastLocation = location
        if (mLastLocation != null) {
            val date: Date = Calendar.getInstance().time
            val sdf = SimpleDateFormat("hh:mm:ss a")
            txtTime.text = "Updated at : " + sdf.format(date)
            txtLat.text = "LATITUDE : " + mLastLocation.latitude
            txtLong.text = "LONGITUDE : " + mLastLocation.longitude
            // You can now create a LatLng Object for use with maps
        }
    }

    protected fun startLocationUpdates() {
        // Create the location request to start receiving updates
        mLocationRequest = LocationRequest()
        mLocationRequest!!.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
        mLocationRequest!!.setInterval(INTERVAL)
        mLocationRequest!!.setFastestInterval(FASTEST_INTERVAL)

        // Create LocationSettingsRequest object using location request
        val builder = LocationSettingsRequest.Builder()
        builder.addLocationRequest(mLocationRequest!!)
        val locationSettingsRequest = builder.build()

        val settingsClient = LocationServices.getSettingsClient(this)
        settingsClient.checkLocationSettings(locationSettingsRequest)

        mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this)
        // new Google API SDK v11 uses getFusedLocationProviderClient(this)
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return
        }
        mFusedLocationProviderClient!!.requestLocationUpdates(mLocationRequest, mLocationCallback,
                Looper.myLooper())
    }
    private fun stoplocationUpdates() {
        mFusedLocationProviderClient!!.removeLocationUpdates(mLocationCallback)
    }
}

이제 프로젝트를 실행하십시오!