Transistor Radio – it is a convenient application for listening to online radio. This open source program supports M3U and PLS formats. Stations can play in the background. Transistor allows you to save an almost unlimited number of online radios in the list. All files that the app uses to play online streams are “stacked” in the /Android/data/org.y20k.transistor/Collection directory.
It is worth noting that Transistor supports the function of automatically creating backups from Android 6.0 Marshmallow. If you use the app on this version of the system, then all your radio stations will be saved and you can transfer them to another device.