Is there a way to intercept all user interactions?

I'm guessing the answer is a custom page renderer, but I thought I'd ask the question: I need to intercept all user interactions to reset a timout (essentially to create a screensaver of sorts). Is there an easy way to do this? I tried capturing a tap event on a content view around all other items on the page, but (at least on Android) this doesn't fire when you tap on child lists, for example.