VR Mini Remote Controller Gamepad Bluetooth Control VR Vide, Wireless Remote Game, Selfie, Flip E-Book/PPT/Nook Page, Mouse, in Virtual Reality Headset for iOS Android System and PC Smartphone Tablet - Walmart.com
GitHub - controlwear/virtual-joystick-android: This library provides a very simple and ready-to-use custom view which emulates a joystick for Android.
DroidJoy Gamepad Joystick Lite - Apps on Google Play
Play with your smartphone using the virtual gamepad | Recalbox Wiki