[android-developers] Starting an actvity from Notifications

My app starts on activity A and can navigate to activity B.

I also have a background service and creates a notification.

Once the user taps on the notification, it calls A and then i create
a new activity B.

the problem is that if the user taps on the notification after the
user has navigated from A  to B - it creates a new instance of B.

So I have A B B.

Like to avoid that.

When activity A is activated by the notification tap - is there a way
I can detect that B is the top activity currently - so that i don't
create a new instance.

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