I\'m trying to implement the behaviour described here, where a notification (or whatever) starts an \"internal\" activity in your app, and then when the user pressed back it
Nice.
But be aware that is does not work on pre-3.0 (pre API level 11) system because PendingIntent.getActivities() is not available there.
And that is the same for constructing a backstack to access an activity from a notification (via Intent) and have the back button behaves coherently with your application (detail activity comes back to list activity for example).