Android - Service LifeCycle

http://androidapps.org.ua/androidintro_gettingtoknow_service.html

Pass data from activity to service

http://android-coding.blogspot.com/2011/03/pass-data-from-activity-to-service.html

How to Update the UI in an Android Activity Using Data from a Background Service

http://www.websmithing.com/2011/02/01/how-to-update-the-ui-in-an-android-activity-using-data-from-a-background-service/