Zaimplementowałem rodzaj zgodny z klasą OnLoadCompleteListener, która działa przynajmniej na Androida 2.1.
Konstruktor pobiera obiekt SoundPool, a dźwięki, dla których wywołano SoundPool.load(..), muszą być zarejestrowane pod numerem OnLoadCompleteListener.addSound(soundId). Następnie słuchacz okresowo próbuje odtworzyć żądane dźwięki (przy zerowej głośności). Jeśli się powiedzie, wywoła twoją implementację onLoadComplete, tak jak w wersji Androida 2.2+.
Oto przykład użycia:
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.
A oto źródło:
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();
}
}
}
Dobre pytanie, miałem ten sam problem (http://stackoverflow.com/questions/3253108/how- do-i-know-that-the-soundpool-is-ready-using-sdk-target-below-below-2-2) i tak naprawdę nie znalazł rozwiązania. – RoflcoptrException