Emulation-Station DE has been released onto the Amazon Appstore, with plans for a Google Play release eventually, though according to the developers, Google has not allowed the app onto the store thus far. The app costs $5.39 USD, and once purchased, allows you to organize, theme, and display your game collections on your phone, tablet, or Android gaming device. It supports over 120 different game platforms, including RetroArch. By using scrapers, Emulation-Station can display boxarts, information, and screenshots for your games, adding a more unified and organized way to access your game library on the platform.
Documentation on the Android version is available to read on GitLab, while the app can be gotten from Amazon's Android appstore.