Android Question Close GPS and MapFragment

I have a GPS and MapFragment in same activity.
I need close GPS STATUS when activity.finish but not works. GPS status are ON.

I do this:

GPS1.Stop

Activity.Finish

but i don't know MapFragment CLOSE.
how do MapFragment close?

i use this items for view a map and get position.

Dim Geocoder1 As Geocoder
Dim GPS1 As GPS
Dim mFragment As MapFragment
Dim gmap As GoogleMap