How do I set a schedule to automatically delete files using Android Studio?

[ReiSixx9]

I want to add a command to my Android Studio app that will make it automatically delete files from a certain folder at a set interval. How do I do this?

Also, can I hide a folder (using a command) so that only my app can see it?

Sorry, I mostly only know stuff about c# and Windows Program Development, I'm new to this android stuff.

Thanks!