MainActivity.kt

package com.example.piumi.location

import android.Manifest
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.location.*
import android.os.*
import android.provider.Settings
import android.support.v4.content.ContextCompat
import android.support.v7.app.AppCompatActivity
import android.util.Log
import kotlinx.android.synthetic.main.activity_main.*

private const val REQUEST_CODE: Int = 101

class MainActivity : AppCompatActivity() {

    private lateinit var mLocationManager: LocationManager

    private var mLocationListener = object : LocationListener {
        override fun onLocationChanged(location: Location?) {
            text_location.text = location?.latitude.toString() + " " + location?.longitude.toString()
        }

        override fun onStatusChanged(provider: String?, status: Int, extras: Bundle?) {
            Log.d("LOCATION", " Status Changed ")
        }

        override fun onProviderEnabled(provider: String?) {
            Log.d("LOCATION", " Provider Enabled")
        }

        override fun onProviderDisabled(provider: String?) {
            var intent = Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)
            startActivity(intent)
        }
    }

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

        mLocationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if ((ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ||
                            ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)) {

                requestPermissions(arrayOf<String>(
                        Manifest.permission.ACCESS_FINE_LOCATION,
                        Manifest.permission.ACCESS_COARSE_LOCATION,
                        Manifest.permission.INTERNET),
                        REQUEST_CODE)
                return
            } else {
                requestLocation()
            }
        }
    }

    private fun requestLocation() {
        button_location.setOnClickListener {

            var criteria = Criteria()
            criteria.setAccuracy(Criteria.ACCURACY_COARSE);
            criteria.setAltitudeRequired(false);
            criteria.setBearingRequired(false);
            criteria.setCostAllowed(true);
            criteria.setPowerRequirement(Criteria.POWER_LOW);

            var provider = mLocationManager.getBestProvider(criteria, true)

            Log.d("LOCATION", "best Provider " + provider)

            mLocationManager.requestLocationUpdates(provider, 1000, 0f, mLocationListener)
        }
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {

        when (requestCode) {
            REQUEST_CODE ->
                if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    requestLocation()
                    return
                }
        }
    }
}