The primary purpose of the app is to make it easier for users to play old-school games through the myriad of NES, SNES, Genesis, etc. emulators available on Android.
However, it also acts as a fully-functioning control device. So any app that allows for standard keyboard input works with the Wii controller configuration.
Here's a Youtube video (originally posted on NintendoLife.com) that showcases the functionality of the Wii Controller Android app:
After installing, users simply change their input from the standard Android keypad to "Wii controller," and then wirelessly sync the controller in a simple 5-second process.
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