Plays an audio / sound file (Mp3) on Android using Processing and the MediaPlayer class.

Android_Play_Audio_File_Processing.pde

/**
 * Android Audio Player example, copied from https://forum.processing.org/two/discussion/12819/how-do-i-get-sound-to-play-on-the-phone
 * 
 * Some audio formats seem not to be recognized (maybe some MP3-codecs as well), put the audio file into the data-directory.
 */

import android.media.MediaPlayer;
import android.content.res.AssetFileDescriptor;
import android.content.Context;
import android.app.Activity;

MediaPlayer mp;
Context context; 
Activity act;
AssetFileDescriptor afd;

void setup() {
  act = this.getActivity();
  context = act.getApplicationContext();
  try {
    mp = new MediaPlayer();
    afd = context.getAssets().openFd("279.mp3");//which is in the data folder
    println("Successfully loaded audio file");
    mp.setDataSource(afd.getFileDescriptor());
    mp.prepare();
  } 
  catch(IOException e) {
    println("file did not load");
  }
  mp.start();
};

void draw() {
}

public void pause() {
  super.pause();
  if (mp !=null) {
    mp.release();
    mp = null;
  }
};

public void stop() {
  super.stop();
  if (mp !=null) {
    mp.release();
    mp = null;
  }
};