[android-developers] Correct way to implement Activity onDestroy()?

I read http://android-developers.blogspot.tw/2009/01/avoiding-memory-leaks.html about avoiding memory leaks.

I would like to know whether I should null out all member variables, such as TextView and Button in onDestroy()? Or, unregistering listener, unbinding service and etc.in onDestroy() are enough to prevent memory leak?

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