Is there any device for convenient control of device while walking? I want to use some my Android device while walking. It is too dangerous to walk while looking at the screen, so I have modified the software I use so that it speaks and beeps so I know what is happening without looking at the screen.

It is still troublesome and dangerous to hold the device and use the touchscreen while walking. I'd rather place the phone in my backpack and hold some very simple controller in my hand.


Wires or wireless are both okay.
I don't need many buttons. Just 2-4 buttons is enough.


Is there any controller device which can plug into an Android device so that I can hold just the small controller while walking?
It sounds like what you want is a presentation clicker. This is a small device used by speakers to control slides during their talk. Usually it uses Bluetooth HID profile, and is visible to the host device as a keyboard or mouse. Alternatively, you might already have a Bluetooth game controller (such as a Playstation controller). Android has support for these built-in.

There are also wired USB presentation clickers, and USB game controllers. If your device supports USB-on-the-go, you can use one of these.