Android :: Trouble With Programmatically Adding Mock Location Data

I am working on an application that requires an approximate position of the user, so basically i am fine with any relatively recent location data i can get. However I can't seem to get things right using mock location data and would therefore appreciate your help. The method i'm having tries to set mock location data for the gps provider and tries to later retrievie it BUT: locationManager.setTestProviderEnabled("gps", true); seems to fail because i do not get any active location provider from the location manager. When I tried using a mock location provider with addTestProvider and give it my mock location, the LocationManager returns me this mock provider with getProviders(true) but then getLastKnownLocation returns null instead of the provided mock location.