How to work with SDL Audio in Android

Hello. I want to create a player for Android that use FFmpeg + SDL. I have done everything in this manual:
With FFmpeg is no problem, but with SDL, there is. Here is a description of the problem:
I got one response about using AudioTrack, but I do not understand how to use it in conjunction with the JNI. Can you give a small example of how to call the play audio through SDL, using AudioTrack?

P.S. I read the code examples in the SDL program under Android, but did not understand how all these methods are called and where they come from, so I ask a simple example.