how to extract part of audio in android

I'm playing an audio in my Android app, and I'd like to ask the user to set the starting and ending point and then copy the audio in-between to another file. How could I do this? So basically, if I have an audio file (in mp3 format currently, but maybe I'll need to convert it?), and two points of time, how can I copy that part of the audio in between to generate a new file in Android?

I'm kind of new to Android programming, so I'd really appreciate a relatively straightforward solution without using too many tools. Isn't there any classes or methods in Android itself to achieve something like this?