[android-developers] Question on launching activity from notification

Hi,

There's a questions when I try to launch a activity from notification.
The activity's task is on the background, if I add singleTask on the
activity's launch mode, after touch notification, the activiy's task
go back to foreground, and the activity is same as before, but if I do
not add singleTask, replace with adding FLAG_ACTIVITY_CLEAR_TOP on the
intent, after touch notification, a new instant of that activity
appears on the top of the task's back stack.

what's happened? follow Android SDK, singleTask is same as
FLAG_ACTIVITY_CLEAR_TOP, but I get different result here?

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