how to detect when an Android activity starts and ends [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Android Activity Life Cycle - difference between onPause() and OnStop()

my question is about if it is possible to detect when an Android activity starts/ends.

The idea would be to have a liste开发者_运维知识库ner o callback method to execute some code during those events, but I can't find anyone :_(

Thank you very much in advance for your help!!!

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Checkout the android activity life cycle. You have hooks available to do custom tasks during the various life cycle events.