无法在Android上使用LibGDX播放2个音乐实例

Question

我在LibGDX制作游戏，我需要同时播放2首旋律。但是在Android上加载和播放2个旋律不起作用。这是我做过的一个小测试。我甚至尝试过使用LibGDX AssetManager，但仍然没有成功。

Music test1;
Music test2;

AssetManager manager = new AssetManager();

@Override public void create()
{
    manager.load(Melody.REVERSION.getPath(), Music.class);
    manager.load(Melody.COLLAPSE.getPath(), Music.class);

    while (!manager.update()) {}
    manager.finishLoading();

    test1 = manager.get(Melody.REVERSION.getPath());
    test2 = manager.get(Melody.COLLAPSE.getPath());

    test1.setVolume(1);
    test1.play();
    test2.setVolume(1);
    test2.play();
}

Answer 1

我目前正在使用SoundPool库。 有了这个，我可以同时重现不同的声音效果，但我不知道它是否是音乐的最佳方法。

相关帖子：Play sound using soundpool example

修改 使用MediaPlayer和CyclicBarrier：

public enum MP_COMMAND {
    START,
    STOP,
    PAUSE
}

/**
 * Uses threads to execute synced commands for the current video media player and 
 * background music player in tandem.
 */
public void syncedCommand(MediaPlayer player1, MediaPlayer player2, MP_COMMAND command) {
    final CyclicBarrier commandBarrier = new CyclicBarrier(2);
    new Thread(new SyncedCommandService(commandBarrier, player1, command)).start();
    new Thread(new SyncedCommandService(commandBarrier, player2, command)).start();
}

/**
 * Inner class that starts a given media player synchronously
 * with other threads utilizing SyncedStartService
 */
private class SyncedCommandService implements Runnable {
    private final CyclicBarrier              mCommandBarrier;
    private       MediaPlayerTest.MP_COMMAND mCommand;
    private       MediaPlayer                mMediaPlayer;

    public SyncedCommandService(CyclicBarrier barrier, MediaPlayer player, MediaPlayerTest.MP_COMMAND command) {
        mCommandBarrier = barrier;
        mMediaPlayer = player;
        mCommand = command;
    }

    @Override public void run() {
        try {
            mCommandBarrier.await();
        } catch (InterruptedException | BrokenBarrierException e) {
            e.printStackTrace();
        }

        switch (mCommand) {
            case START:
                mMediaPlayer.start();
                break;

            case STOP:
                mMediaPlayer.stop();
                break;

            case PAUSE:
                mMediaPlayer.pause();
                break;

            default:
                break;
        }
    }
}

要播放这两首歌曲，请拨打：

MediaPlayer mCurrentVideoPlayer = MediaPlayer.create(this, R.raw.track1);
MediaPlayer mBackgroundMusic = MediaPlayer.create(this, R.raw.track2);

syncedCommand(mCurrentVideoPlayer, mBackgroundMusic, MP_COMMAND.START);

参考：Playing multiple songs with MediaPlayer at the same time: only one is really playing