I recently saw that there is a desktop emulator available for Android auto
https://www.tuttoandroid.net/google/google-releases-an-android-emulator-auto-per-desktop-300745/
It appears that the apps are run on the smartphone and then sent through the usb cable as a video stream to the car radio.
It would be very interesting to develop apps such as a rear view camera for parking and multimedia or other.
I wonder if with B4a it is possible or if it will be, to develop apps to be used on cars that have a device with Android auto.
Best regards