CODEWITHSUNDEEP
androidgps
Sterling Duchess
Sterling Duchess

Reputation: 2120

Android receives GPS Fix when called with getLastKnownLocation but not when called without it

Here is the code I have at the moment:

public class Map extends FragmentActivity implements LocationListener
{

  private Location l;
  private Location x;

  @Override
  protected void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);

    LocationManager provider = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    provider.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);

    l = provider.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    showm();

    SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
    Date date = new Date(l.getTime());

    Toast.makeText(this, "Fix received on: " + format.format(date), Toast.LENGTH_SHORT).show();
  }

  void showm()
  {
    Toast.makeText(this, "Latitude: " + l.getLatitude() + ", Longitude: " + l.getLongitude(), Toast.LENGTH_SHORT).show();

  }

  @Override
  public void onLocationChanged(Location location)
  {
    if(location != null)
      x = location;
  }

Now this code works if I run the app the LocationListener method is invoked and GPS fix is received now right after that I call provider.getLastKnownLocation and according to the Date from Second Toast I got the current location and the showm() method will show a toast with correct Long/Latitude.

Upvotes: 0

Views: 107

Answers (1)

user755
user755

Reputation: 2661

showm() should be inside onLocationChanged(Location location).

you are trying to show the location while the query is still in progress. On GPS fix a new location is reported via callback onLocationChanged(...) method. else a NULL(which is the reason for null exception).

Upvotes: 1

Related Questions