how to ask user for his location in android

1public class MainActivity extends AppCompatActivity {
2  
3   //'LocationManager' manages location tracking
4   /*'LocationListener' gives us updates about whenever the device moves, it gives us updates on all those */
5
6    LocationManager locationManager;
7    LocationListener locationListener;
8
9    @Override
10    protected void onCreate(Bundle savedInstanceState) {
11        super.onCreate(savedInstanceState);
12        setContentView(R.layout.activity_main);
13
14        //STEP 1: Declare and Initialize 'LocationManager' and 'LocationListener'
15        //To get users location
16        locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
17
18        //To get users permissions and updates about device movement
19        locationListener = new LocationListener() {
20            @Override
21            public void onLocationChanged(Location location) {
22                Log.i("Location:", location.toString());
23            }
24
25            @Override
26            public void onStatusChanged(String provider, int status, Bundle extras) {
27
28            }
29
30            @Override
31            public void onProviderEnabled(String provider) {
32
33            }
34
35            @Override
36            public void onProviderDisabled(String provider) {
37
38            }
39        };
40
41        //STEP 2: Create a Pop up message that ask the user to access his location
42
43        //The following if statement will execute when the user opens the app for the first time, which means he has
44        //not provided permission for anything yet, in which case the we will go ahead and ask for his permission.
45        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
46            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
47        } 
48        //user has already granted you permission so just go ahead and get updates. In this case the code will not continue to STEP 3.
49      	else {
50            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
51        }
52    }
53
54
55    //STEP 3: Respond accordingly to whether user granted permission or not
56    @Override
57    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
58        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
59
60        //Check if the user granted permission in step 2
61        if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
62
63            //If Yes, then go ahead and grab the users location user 'LocationManager' and 'LocationListener'
64            if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
65                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
66            }
67
68        }
69    }
70}