em kotlin: gps primeira versão

ficheiro: AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="pt.isec.estuda.amov_gpsv1">

    <!-- pedir estas permissões -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Amov_gpsv1">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

ficheiro: MainActivity.kt

package pt.isec.estuda.amov_gpsv1

import android.Manifest
import android.content.pm.PackageManager
import android.location.Location
import android.location.LocationListener
import android.location.LocationManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import androidx.core.app.ActivityCompat

const val TAG = "Location"

class MainActivity : AppCompatActivity(), LocationListener {

    lateinit var locationM : LocationManager
    var locEnable = false //caso não ajam permissões

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

        locationM = getSystemService(LOCATION_SERVICE) as LocationManager
    }

    override fun onResume() {
        super.onResume()
        startLocationServices(true)
        //para poupanças de energia, ativar o mais tarde possivel
    }

    override fun onPause() {
        super.onPause()
        //para poupanças de energia, desactivar o mais cedo possivel
        if(locEnable) {
            locationM.removeUpdates(this)
            locEnable = false
        }
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        //se tivermos as permissões
        //locationM.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 100f, this)
        if(requestCode == 1289) {
            startLocationServices(false)
        }
    }

    fun startLocationServices(askPerm : Boolean){
        //1ºprovider, 2º intervalo de segundos,3º distancia minima ,4º  o listener
        //se for for telemovel NETWORK_PROVIDER
        //dar permissões: ACCESS_FINE_LOCATION
        //e pedir em runtime, add permissions check
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
            //pedir as permissões //&& ou ||
                if(askPerm) {
                    ActivityCompat.requestPermissions(this, arrayOf(
                            Manifest.permission.ACCESS_FINE_LOCATION,
                            Manifest.permission.ACCESS_COARSE_LOCATION), 1289) //1289 um valor qualquer!
                }else{
                    finish()
                }
            return
        }
        locationM.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 100f, this)
        locEnable = true
        //outras:
        //addProximityAlert, funções de proximidade para um determinado local
        //addNmeaListener, ir buscar as mensagens de baixo nivel que um chip gps consegue obter
        //requestSingleUpdate, ir buscar apenas um update(uma localização armazenada)
        //getLastKnownLocation, obter um objeto Location, obtemos logo uma localização mesmo que não seja correta
        //providers, acerca dos requisitos da rede
    }

    override fun onLocationChanged(location: Location) {
        val latitude = location.latitude
        val longitude = location.longitude
        Log.i(TAG, "onLocationChanged: $latitude $longitude")
        //a ver o location.distanceTo()

    }
}
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