Getting null from 'getLastKnownLocation' on SDK

Question

I have a problem related to the Location API.

I tried the following code:

LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location loc = getLastKnownLocation(LocationManager.GPS_PROVIDER);

loc is always null, when getLastKnownLocation() is called.

What is wrong?

Answer 1

Along with the permissions in your AndroidManifest.xml file, have you registered a location listener?

LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location loc = getLastKnownLocation(LocationManager.GPS_PROVIDER);
lm.requestLocationUpdates(LocationManager.GPS, 100, 1, locationListener); 

Then have a method, in this case locationListener, to complete your task

private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
    latitude = location.getLatitude();
    longitude = location.getLongitude();
}

Answer 2

If you're running the code in the emulator, any calls to get the GPS location will return null until you explicitly update the location (via Eclipse or ADB).