Can I connect the DAC3 to my Android device?

The DAC3 will work with Android or any device that can operate as a USB-C host, can provide enough power via USB, and includes generic drivers for standard USB audio playback.  A device with Android 5.0 or later should have both USB host mode and native plug-and-play functionality for USB audio, so you could connect the two together using the included USB-C cable.