How to find out why GPS coordinates are missing in Android?

Question

I am trying to get a device\'s location information using GPS, but for some reason one of the two coordinates is missing sometimes.

This is the code:

Loc         


        

Answer 1

Because the GPS isn't always on. getLastKnownLocation will return a location if it knows one and if it isn't too stale. Since nothing else was using the GPS, it doesn't know one. If you need a location, either requestLocationUpdates or requestSingleUpdate, which will turn on the GPS and get a new location.

Answer 2

 Criteria criteria = new Criteria();
    LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
   // mMap.addMarker(new MarkerOptions().position(sydney2).title("fi"));
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    locationManager.requestLocationUpdates(locationManager.getBestProvider(criteria, true), 2000, 0, new android.location.LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
           // 
        }

in onLocationChanged method you can use location.getLatitude & location.getLongitude