Simple app: Enumerate all HID on Android

Mobile developer to implement a simple application that lists all human interface devices present on an Android system. Such devices would include the screen and touch sensor, microphone, speakers, buttons, accelerometers and magnetometers, etc, and also characteristics about those sensors such as resolution, quantity, update rate, and so on. If multiple input methods can be registered (such as the keyboard) to a virtual input type list all registered, if possible. Also included as a deliverable is some kind of justification that you have exhaustively enumerated all such devices and an overview of how the application can be maintained in the future as new device types are added.