Make me a very very simple and basic app that allows users to record the sound that their devices are playing.
This app must be able to record while in the background.
I DO NOT WANT fancy designs, make it in the simplest and basic way possible. No settings (It must record in one format, one bitrate, everything by default), no fancy stuff and no ads.
Just a very very simple and basic internal audio recorder for androids. Compatible with lots and lots of Smartphones and android OS versions.