I have a Joying RK3188 stereo (KIT KAT 4.4)in a Wrangler, there are 2 apps in the play store. One is labeled "RK3188 HeadUnit" that does not work at all. Use the app labeled "RK3066 HeadUnit"
When I installed it, it played my default music player first, even after I selected Spotify to be the...