android unlock screen intent?

Yes, the ACTION_USER_PRESENT is broadcasted after the user unlocks:

http://developer.android.com/reference/android/content/Intent.html#ACTION_USER_PRESENT

Note that this is a protected broadcast and if the user is using a lock screen replacement such as WidgetLocker or NoLock the USER_PRESENT may not be sent or may be sent at the wrong time.

For detecting WidgetLocker‘s unlock see:
http://teslacoilsw.com/widgetlocker/developers

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