Implementé una clase compatible con OnLoadCompleteListener que funciona al menos para Android 2.1.
El constructor toma un objeto SoundPool, y los sonidos para los que se ha llamado al SoundPool.load(..) deben registrarse con OnLoadCompleteListener.addSound(soundId). Después de esto, el oyente periódicamente intenta reproducir los sonidos solicitados (a volumen cero). Si tiene éxito, llama a su implementación de onLoadComplete, como en la versión de Android 2.2+.
Aquí está un ejemplo de uso:
SoundPool mySoundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 0);
OnLoadCompleteListener completionListener = new OnLoadCompleteListener(mySoundPool) {
@Override
public void onLoadComplete(SoundPool soundPool, int soundId, int status) {
Log.i("OnLoadCompleteListener","Sound "+soundId+" loaded.");
}
}
int soundId=mySoundPool.load(this, R.raw.funnyvoice,1);
completionListener.addSound(soundId); // tell the listener to test for this sound.
y aquí está la fuente:
abstract class OnLoadCompleteListener {
final int testPeriodMs = 100; // period between tests in ms
/**
* OnLoadCompleteListener fallback implementation for Android versions before 2.2.
* After using: int soundId=SoundPool.load(..), call OnLoadCompleteListener.listenFor(soundId)
* to periodically test sound load completion. If a sound is playable, onLoadComplete is called.
*
* @param soundPool The SoundPool in which you loaded the sounds.
*/
public OnLoadCompleteListener(SoundPool soundPool) {
testSoundPool = soundPool;
}
/**
* Method called when determined that a soundpool sound has been loaded.
*
* @param soundPool The soundpool that was given to the constructor of this OnLoadCompleteListener
* @param soundId The soundId of the sound that loaded
* @param status Status value for forward compatibility. Always 0.
*/
public abstract void onLoadComplete(SoundPool soundPool, int soundId, int status); // implement yourself
/**
* Method to add sounds for which a test is required. Assumes that SoundPool.load(soundId,...) has been called.
*
* @param soundPool The SoundPool in which you loaded the sounds.
*/
public void addSound(int soundId) {
boolean isFirstOne;
synchronized (this) {
mySoundIds.add(soundId);
isFirstOne = (mySoundIds.size()==1);
}
if (isFirstOne) {
// first sound, start timer
testTimer = new Timer();
TimerTask task = new TimerTask() { // import java.util.TimerTask for this
@Override
public void run() {
testCompletions();
}
};
testTimer.scheduleAtFixedRate(task , 0, testPeriodMs);
}
}
private ArrayList<Integer> mySoundIds = new ArrayList<Integer>();
private Timer testTimer; // import java.util.Timer for this
private SoundPool testSoundPool;
private synchronized void testCompletions() {
ArrayList<Integer> completedOnes = new ArrayList<Integer>();
for (Integer soundId: mySoundIds) {
int streamId = testSoundPool.play(soundId, 0, 0, 0, 0, 1.0f);
if (streamId>0) { // successful
testSoundPool.stop(streamId);
onLoadComplete(testSoundPool, soundId, 0);
completedOnes.add(soundId);
}
}
mySoundIds.removeAll(completedOnes);
if (mySoundIds.size()==0) {
testTimer.cancel();
testTimer.purge();
}
}
}
Buena pregunta, que tenía el mismo problema (http://stackoverflow.com/questions/3253108/how- do-i-know-that-the-soundpool-is-ready-using-sdk-target-below-2-2) y realmente no encontró una solución. – RoflcoptrException