I made a quick video of the avh-4100nex working with android auto today. We used an htc m8 one with a standard usb to micro cable. After downloading the app I just plugged the phone in and it instantly worked. My biggest complaint is how I cant use anything other than google play for music right now.
https://youtu.be/SMM5G5tgsu0?list=UUN0Htu6VCuinhDkLLWgG3wQ