Finding Location : Google Play Location Service or Android platform location APIs

i am trying to get the users location for my new navigation app. i want to check the users location frequently and it has to be accurate . I use the following code from sample to get the location . ``` public class MainActivity extends Activity implements LocationListener { private LocationManager locationManager; private String provider; private TextView a; private TextView b; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); a = (TextView) findViewById(R.id.a); b = (TextView) findViewById(R.id.b); locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); Criteria criteria = new Criteria(); provider = locationManager.getBestProvider(criteria, false); Location location = locationManager.getLastKnownLocation(provider); if (location != null) { System.out.println("Provider " + provider + " has been selected."); onLocationChanged(location); } else { a.setText("Location not available"); b.setText("Location not available"); } } @Override protected void onResume() { super.onResume(); locationManager.requestLocationUpdates(provider,0, 1, this); } @Override protected void onPause() { super.onPause(); locationManager.removeUpdates(this); } @Override public void onLocationChanged(Location location) { Double lat = location.getLatitude(); Double lng = location.getLongitude(); a.setText(String.valueOf(lat)); b.setText(String.valueOf(lng)); } @Override public void onStatusChanged(String provider, int status, Bundle extras) { // TODO Auto-generated method stub } @Override public void onProviderEnabled(String provider) { Toast.makeText(this, "Enabled new provider " + provider, Toast.LENGTH_SHORT).show(); } @Override public void onProviderDisabled(String provider) { Toast.makeText(this, "Disabled provider " + provider, Toast.LENGTH_SHORT).show(); } } ``` But location cordinates are not updating as i move,i get a constant value always ... is there any better way to get location ? According to to android docs i can use Google Play Location Service or Android platform location APIs for this . I checked the sample code for both and it implements the LocationListener interface to get the user location .So whats the actual difference between them?