Dynamically re-reading a midi file

I am writing an app that dynamically creates a midi file which I then want to play. Each time I pr开发者_JAVA百科ess a button in my app a new midi file is created and written to external storage. I then want the app to read that file and play it. I am using SoundPool to play the file. However, from the samples I have found, SoundPool is initialized during onCreate and therefore my file is only read once. Meaning the same file is played everytime I hit the button regardless of any changes I make to it. I have tried moving the SoundPool initialisation into my Audio1ButtonHandler method but then I get no sound or get a selection of “sample x not ready” errors. The relevant code from my app is here:

public void onCreate(Bundle savedInstanceState) {
            …………
  soundPool = new SoundPool(1, AudioManager.STREAM_MUSIC, 0);
        soundPoolMap = new HashMap<Integer, Integer>();
        soundPoolMap.put(SOUNDPOSITION, soundPool.load("/sdcard/test.mid", 1));

    }

public void Audio1ButtonHandler(View target) {
      ArrayList<Integer> chord = new ArrayList<Integer>();
      chord = Chord.calculateChord(kSelection, cSelection);
      for (int i = 0; i < chord.size(); i++) {
            System.out.println("chord value is " + chord.get(i).toString());
      }
      Midi.createMidiFile(chord);
        playSound();
        releaseSound();
     }

public void playSound() {
        AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
        float streamVolumeCurrent = mgr.getStreamVolume(AudioManager.STREAM_MUSIC);
        float streamVolumeMax = mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        float volume = streamVolumeCurrent / streamVolumeMax; 
        soundPool.play(soundPoolMap.get(SOUNDPOSITION), volume, volume, 1, 0, 1f);
       }

public void releaseSound() {
        soundPoolMap.clear();
        soundPool.release();
       }

As you can see I have tried to release the resources (within releaseSound) to try and force them to be re-read but to no avail.

Any pointers would be greatly received. Thanks

First stop playing before you release! Then, after release, set soundPool to null.