Andrei wrote:
> it has Notification as arg

Yes.

> what is it for

startForeground() is used to give preferential treatment to a service
that is doing something actively on behalf of the user. The Notification
is required to ensure that the user "sees" your service. It would be a
Really Good Thing if your Notification would give the user a quick path
to stop your service, or at least return it to normal background status.

> when is it shown

The documentation is fuzzy on this point, but I believe
startForeground() will display the Notification at the time you call
that method. Conversely, when you call stopNotification(), the
Notification is canceled.

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy

Android Consulting/App Development: http://commonsware.com/consulting

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