Android :: Intercepting - Blocking All Hardware Buttons From Working

I'd love to prevent hardware buttons from working while user runs my app. Perfectly all of them, but any number would help :) I am not sure it's doable but maybe I miss something, hence my question. For those wondering - "why?" - we got an app that does full screen colorful animation and users often run it and hand the phone to their babies as they can stare at it for hours :) but the problem is, kids accidentally press hardware buttons (usually camera trigger, but also Home or Search - depending on the device model). I'd love to add the option to block all keys beside one which can hardly be pressed accidentally.