Getting the number of satellites from Location object

Question

I'm using a GPS provider and LocationListener.onLocationChanged(Location location) to receive location fixes.
Documentation says, that Location.getExtras() contains next key/value pair:

satellites - the number of satellites used to derive the fix

but on practice I'm getting an empty extra object - there is no any data there.
Does it means that I'm getting the A-GPS fixes and not GPS?

Answer 1

To get the number of satellites used by the GPS engine you need to implement android.location.GpsStatus.Listener and implement its method onGpsStatusChanged().

Example...

public void onGpsStatusChanged(int event) {
    int satellites = 0;
    int satellitesInFix = 0;
    int timetofix = locationManager.getGpsStatus(null).getTimeToFirstFix();
    Log.i(TAG, "Time to first fix = " + timetofix);
    for (GpsSatellite sat : locationManager.getGpsStatus(null).getSatellites()) {
        if(sat.usedInFix()) {
            satellitesInFix++;              
        }
        satellites++;
    }
    Log.i(TAG, satellites + " Used In Last Fix ("+satellitesInFix+")"); 
}