[android-developers] How to detect when user switches Tasks (stack of Activities)?

Say that TaskA is currently in the foreground and my ActivityA is
somewhere within its stack. Is there a way for ActivityA to get
notified or detect when the user switches from TaskA to TaskB?

As a use scenario, when the user launches my app, my ActivityA will
always be the root Activity of the newly created Task. ActivityA will
make use of Activities from other Apps, which will be pushed on the
same Task. I would like to get notified when the user has switched to
another application. In this case, onStop() in MyActivityA does not
suffice as that will also get invoked if the user navigates to another
screen within my app.

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