This application can serve as a basic framework for a soundboard.
Copy your mp3 files into app/src/main/res/raw directory,
ClipEntry will pick these up, replace underscores with spaces, and that filename will
be what is displayed in the application.
Alternatively, you can add a display name to app/src/main/res/strings/xml to change the display
name to something different, below is an example:
<string name="filename_no_extension">Name on app screen</string>