I want to create a Custom Android auto app without doing driver distraction. I went through a lot of blogs and sites and I saw that there used to be custom apps that were blocked since the version 3.0. The developers of those custom apps were using an unofficial Android Auto SDK (https://github.com/martoreto/aauto-sdk) which has been removed.
Is there a way to build a custom Android auto app which is completely legal?
Is there any open source SDK-for-auto that is still available?
(Note: Please don't mark this as duplicate as I went through the other questions & solutions and tried everything but none worked so far)