What the state of aftermarket Android integration is:
Unlike the auto manufacturers most aftermarket head units include seemless Android support. At CES we saw stereos from popular aftermarket manufacturers Pioneer, Kenwood, JVC, and Dual that support Android integration, including some that support screen mirroring and full control of Android devices. Dual also showcased a bluetooth receiver that is connected between an aftermarket head unit and outboard amplifier (or if you plan on only using bluetooth, the head unit is not necessary). Several smaller brands that you may not have previously heard of (including Autonet, Road Rover, and Skypine) showed head units that include Android screen mirroring, are shaped exactly like the stock units, and use the factory harnesses making installation clean and simple.