Hi, 
I found this change which I believe answers my question: 
https://cs.android.com/android/_/android/platform/frameworks/base/+/b896c588af5489999c3a22e3713a2491811456c2

"... building all of CarSystemUI as a library and then including that 
library as a static lib for an android_app target. Thus anyone that wants 
to build a derivative to CarSystemUI can include that library and start 
extending. It is the same mechanism that allows CarSystemUI to extend the 
phone SystemUI"

I hope this saves time to others.

On Thursday, August 13, 2020 at 8:26:27 PM UTC+2 [email protected] wrote:

> Hi,
>
> I have a doubt regarding the new CarSystemUI introduced in Android Q. In 
> Android P, most of the code and resources from CarSystemUI were part of the 
> original SystemUI, so in order to build a custom SystemUI one would just 
> need to override the original SystemUI. In Q, however, CarSystemUI is 
> already overriding the original SystemUI. My question is what is the 
> approach to follow in Q in order to build a custom car SystemUI, should 
> this custom one replace CarSystemUI or still SystemUI? I have been 
> struggling with this for a while due to some dependencies in the .bp files 
> and I am not sure which approach is the right one.
>
> Thanks a lot for your help!
>

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