Don't know if you're still having this problem, but try this. 
http://www.websmithing.com/2011/02/01/how-to-update-the-ui-in-an-android-activity-using-data-from-a-background-service/comment-page-1/#comment-734

Your service broadcasts the data with an intent, for your main application 
to access. 
sorry if this sounds wack, but just try the turorial in the link. I had the 
same problem for 2 days and couldn't get a descent link to a solution till 
this.

On Friday, January 14, 2011 3:57:26 PM UTC+2, AntiWiggin wrote:
>
> Hello, I'm writing an application that keeps track of certain 
> statistics using the devices GPS (average speed, distance from the 
> last location, etc...). Now initially I just did this in my activity 
> but then I realized I would like the user to be able to turn off the 
> screen and still have the GPS keep track of these statistics. 
>
> My question is how can my activity retrieve this data from the 
> service?

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