I have a radio app on my Nokia G21, buts its kinda shitty, hard to navigate cant record and clunky. Im looking for another FM radio apps, I only found ones that use the internet, and do not take the signal from the phones FM antenna, but from a server. I dont know if this can be accessed by any app, sadly I cannot root(Cant unlock bootloafer), but I can use ADB or shizuku.
I looked into this for my Samsung a while ago. At the time, there was no published API for the radio - each manufacturer had their own proprietary API that they kept to themselves. Which is why there aren’t any third party apps.
I’m not familiar with reverse engineering, but maybe you can sniff the intents the Nokia app is using? That or decompile it.
I remember I installed a app that tried to connect to that. Dont know reverse engeniring or coding tho