Hi,

I'm currently investigating the possibility to write a custom ROM for
our own ICS based OEM device. This ROM should (according to UX design)
contain floating back/home buttons (so they are rendered ON TOP of the
activity). This custom look and feel of the NavigationBar should only
apply for our home grown App's -- any additional App should get the
normal navigation bar or at least the layout to be "pushed" up (since
3rd party apps don't know about the dead zone below the custom
navbar).

I have been experimenting with changing the WindowManagerPolicy in
combination with the SystemUI Service for this. Which gave me a little
space in the screen for a button.

I think the nicest way would be to create an additional theme which an
application could set to say I want your specific style of
NavigationBar.

Would there be a way to use such a (proprietary) theme that only
triggers policy behaviour?

Note:
Unfortunately the NavigationBar code is hard to comprehend since it is
bloated into several huge classes. I get the feeling it is rushed in
(you can see it in code style and some comments are not fixed). Also
the interface to turn the whole bar on/off/low-profile is done through
the View class.... This doesn't look like a proper place to control
for a feature that only appears in the Decor view.
@Android devs: Is there any refactoring planned to make this somewhat
nicer?

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