Samsung's Wi-Fi AllShare HUB is a compact display receiver which mirrors your smartphone's screen on any external display. One YouTube user, "jimmiedogg12", has uploaded a video showing how the device works with Pioneer AppRadio 3.
The advantage of using a device like this is the wireless connection. There's no need to use an MHL or any other connector. The HUB connects to the AppRadio 3 through an HDMI cable.