The home button is not something applications ever see.
The back button is always required to be available on the device (even if
that is done through an on-screen affordance).
The search button has always been and is still one of many optional extra
keys.
The menu key until 3.0 was a required k
Interestingly, Android SDK 14/version 4.0 introduced:
http://developer.android.com/reference/android/view/ViewConfiguration.html#hasPermanentMenuKey%28%29
I discovered this with a leaked Google+ 2.0 app that would crash on
loading Chord with a Class. However, the Home, Back and Search buttons
don
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