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Recently, I created a simple application to get the GPS location and display it on an Android phone. In the beginning I was able to get the location after a few tries. But, after I reinstalled the APK file, the getLastKnownLocation() always returns a null value. The development environment: API 10 Gingerbread 2.3.6 GPS provider is used Below is the code I applied to my Android project: public class MyActivity extends MapActivity { protected void onCreate(Bundle savedInstanceState) { mapView = (MapView) findViewById(R.id.myTripMap); mapController = mapView.getController(); mapView.setSatellite(false); mapView.setStreetView(true); mapView.displayZoomControls(false); mapView.setBuiltInZoomControls(true);// mapView.setClickable(true); mapController.setZoom(14); Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_LOW); provider = locationManager.getBestProvider(criteria, true); location = locationManager.getLastKnownLocation(provider); updateMyCurrentLoc(location); locationManager.requestLocationUpdates(provider, 2, 1, locationListener); } private final LocationListener locationListener = new LocationListener() { public void onLocationChanged(Location location) { updateMyCurrentLoc(location); } public void onProviderDisabled(String provider) { updateMyCurrentLoc(null); } public void onProviderEnabled(String provider) { } public void onStatusChanged(String provider, int status, Bundle extras) { } }; private void updateMyCurrentLoc(Location location) { if (location != null) { // other codes to get the address and display Toast.makeText(getBaseContext(),

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