GPS: loc.getLatitude/Longitude always results in 0.0

Question

Hello,

I used this tutorial to write my app. I use the DDMS Location Manager to change my location virtually.

Unfortunally I always get a location of 0.0 for long and lat. Even if I switch them later in the prog with locationchanged-method I get 0.0.

Code is this:

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

  //---use the LocationManager class to obtain GPS locations---
    lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);    
    locationListener = new MyLocationListener();
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener); 

    Location lastLoc = lm.getLastKnownLocation("gps");

    curLocation = "Standort: \nLatitude: " + lastLoc.getLatitude() + "\nLongitude: " + lastLoc.getLongitude();

    upperText = (TextView) findViewById(R.id.TextView01);
    upperText.setText(curLocation);
}

and

    @Override
    public void onLocationChanged(Location loc) 
    {
        if (loc != null) {
            Toast.makeText(getBaseContext(), 
                "Location changed : Lat: " + loc.getLatitude() + 
                " Lng: " + loc.getLongitude(), 
                Toast.LENGTH_SHORT).show();
        }

        if (loc != null) 
        {
            upperText.setText(curLocation + "\n\nStandort: \nLatitude: " + loc.getLatitude() 
                    + "\nLongitude: " + loc.getLongitude());
        }
    }

Something's missing, but I don't know what... :/

I'd be really pleased if anyone could help =)!