LocationManager.getLastKnownLocation() returns null, and onLocationChanged never gets called

Question

This code is used on the onCreate block in my MapActivity

lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        if (!lm.isProviderEnabled(LocationManager.GPS_PROVIDER))
        {
            Toast.makeText(this,
                    "Por favor, habilita el GPS antes de usar esta opción",
                    Toast.LENGTH_SHORT).show();
            finish();
        }
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
        Location loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        doYourMapMagicBaby(loc);

No matter what, loc always returns null. Anyway, when I register for updates on the GPS, the logcat logs my position correctly.

08-24 09:21:18.479: D/libloc(260): Latitude:  40.4399979 (intermediate)
08-24 09:21:57.500: D/libloc(260): Longitude: -3.6700022

So I thought I could implement what I want to do via the onLocationChanged() method. No luck either.

public void onLocationChanged(Location location)
{
    if (location != null)
    {
        System.out.println("La localizacion es: (lon: "
                + location.getLongitude() + ", lat: "
                + location.getLatitude() + ")");
        doYourMapMagicBaby(location);
    }
    else
    {
        System.out.println("La location es nula");
    }

}

What am I doing wrong?

System out won't get you anywhere. Use the android Log class. — njzk2, Aug 24 '12 at 07:36
I'm just debugging. System.out.println actually prints in the Log. I will remove them when I'm done. — Charlie-Blake, Aug 24 '12 at 07:40
Are you sure that location was provided by the GPS? Why don't you check the provider as well? — Moises Jimenez, Aug 24 '12 at 08:17

score 0 · Accepted Answer · answered Aug 24 '12 at 07:25

0

Please check out whether, provider is currently enabled because If the provider is currently disabled, null is returned. http://developer.android.com/reference/android/location/LocationManager.html#getLastKnownLocation(java.lang.String)

answered Aug 24 '12 at 07:25

monish_sc

146
6

that's, like, the 3rd line of the question... (Although you should return after finish() because the rest of your treatment is still executed) – njzk2 Aug 24 '12 at 07:35
Also, the logcat is printing my location, so the GPS certainly has my location. – Charlie-Blake Aug 24 '12 at 07:35
http://stackoverflow.com/questions/6166317/why-does-the-locationmanager-does-not-have-a-lastknown-location?lq=1 – monish_sc Aug 24 '12 at 07:45

LocationManager.getLastKnownLocation() returns null, and onLocationChanged never gets called

1 Answers1