update the graphics from one class to another (Android)

How do i update the Graphics through another Class. more precisely, I have an activity that contains a LinearLayout with TextView inside. Then I have another class that extends GCMBaseIntentService. I like using this class to call a static method of the TextView before ellimini all. The method i've done that, and are also able to call using the second class, but does not execute any commands! and the components remain the same ..