/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    LocationListener locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
        String lat = String.valueOf(location.getLatitude());
            String lon = String.valueOf(location.getLongitude());
            Log.i("NOTIFICATION","onLocationChenged Triggered");
            Toast.makeText(GPS.this,"location changed: lat="+lat+", lon="+lon, Toast.LENGTH_LONG).show();
        }
        public void onStatusChanged(String provider, int status, Bundle extras) {}
        public void onProviderEnabled(String provider) {}
        public void onProviderDisabled(String provider) {}
    };
    LocationManager locationManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}