I’m making logging app.

I want to add a features to app, that is logging whether gear is on use (user uses gear for some subject)

So I have a question.

Is it possible to check the gear is on use or not?

If possible, how can I implement that?

I don’t mean that whether screen is on or not. because it can happen when I watch gear only and not use it.

I want to know that user uses some application