requestLocationUpdates.java

LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
   public void onLocationChanged(Location location) {
     // Called when a new location is found by the network location provider.
     doSomethingWithLocation(location);
   }
   public void onStatusChanged(String provider, int status, Bundle extras) {}
   public void onProviderEnabled(String provider) {}
   public void onProviderDisabled(String provider) {}
 };
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);