DroidPlay is an AirPlay client for Android that can be used in conjunction with ExoAirPlayer. Though most likely unmaintained (there was no commit since 10/2015), the author of the latter app says it is absolutely working fine:

„DroidPlay is a great client for sharing images and audio/video media from one Android device.. and watching them in ExoAirPlayer on another.“

Features:

Automatic discovery of AirPlay services (e.g. Apple TV, AirServer) within same network
Beam photos from your device