[androidbrasil-dev] Pegar latitude longitude Android - Location == null

Estou com problema para pegar a latitude e longitude no Android. Usando esta função, sempre o "location" retorna "null".

public void onCreate() {      LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);      Criteria criteria = new Criteria();      criteria.setAccuracy(Criteria.ACCURACY_FINE);      String provider = locationManager.getBestProvider(criteria, false);      Location location = locationManager.getLastKnownLocation(provider);      if (location != null) {          la = location.getLatitude();          lo = location.getLongitude();          Log.d("create", "la = " + la + " e lo = " + lo);          new Thread(localizacao.this).start();      } else {          Log.d("update", "location null");      }  }    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

Podem me ajudar?