Of course you can do many things with the raspberry, but isn't using it instead of our old car radio an amazing thing?
For this there is Crankshaft which is a brilliant solution, just connect your Android Smartphone to the Pi and you're done!
At the moment I use this release:
https://github.com/opencardev/crankshaft/releases/tag/csng-alpha5
I have been testing it for a few days and I am feeling really well there but for the moment I have not officially mounted it on my car yet.
This is the official site for all information:
https://getcrankshaft.com/
I use balenaEtcher for flash the SD
Then just insert the SD into the Raspberry and you're done.
An important thing that I remind you is that Crankshaft is optimized for a 7 inch screen. I tried to use it with a 3.5-inch screen but without results, so if you can do it, let me get it!