How to detect whether the user some time in the android operating procedures

For example, users no operation within a period of time, the screen brightness is reduced,
Users continue to operate, the screen returns to normal<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
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If it is their own program, then the listener
Rewrite this onTouchEvent event, and then determine whether to go through Timer timed events.
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Upstairs positive solution, using a system-wide timer can
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Landlord look at this PowerManager.WakeLock
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Hello, how to determine the user's operation of the entire device there?
Thank you very much
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cited landlord u010534846 reply:

no such operation within the user for some time, the screen brightness is reduced,
Users continue to operate, the screen returns to normal

The landlord Hello, your problem solved? There code you share it? Thank you very much.
There is how to determine its own procedures which do not operate the whole system?