public class MusicPlayer {
  private Context mContext ;
  private static MusicPlayer sInstance ;
  static class Type{
    public final static int MUSIC_CLICK = 1 ;
    public final static int MUSIC_FOCUSED = 2 ;
  }
  private SoundPool mSp ;
  private Map<integer ,integer=""> sSpMap ;
  private MusicPlayer(Context context){
    mContext = context ;
    sSpMap = new TreeMap<integer ,integer="">() ;
    mSp = new SoundPool(10 ,AudioManager.STREAM_MUSIC ,100) ;
    sSpMap.put(Type.MUSIC_CLICK, mSp.load(mContext, R.raw.click, 1)) ;
    sSpMap.put(Type.MUSIC_FOCUSED, mSp.load(mContext, R.raw.focused, 1)) ;
  }
   
  public static MusicPlayer getInstance(Context context){
    if(sInstance == null)
      sInstance = new MusicPlayer(context) ;
    return sInstance ;
  }
   
  public void play(int type){
    if(sSpMap.get(type) == null) return ;
    mSp.play(sSpMap.get(type), 1, 1, 0, 0, 1) ;
  }
}

// 在界面上需要這樣調(diào)用
// 初始化
mMusic = MusicPlayer.getInstance(MainActivity.this) ;
// 在onClick中播放click時的聲音
mMusic.play(MusicPlayer.Type.MUSIC_CLICK) ;
// 在onFocusChange中聚焦狀態(tài)播放聚焦的聲音
mMusic.play(MusicPlayer.Type.MUSIC_FOCUSED) ;

MediaPlayer mMediaPlayer = new MediaPlayer() ; 
  AssetFileDescriptor fd = mContext.getAssets().openFd(“music/click.pm3”) ; // assert目錄下的music目錄
  mMediaPlayer.setDataSource(fd.getFileDescriptor() ,fd.getStartOffset() ,fd.getLength()) ;
  mMediaPlayer.prepare() ;
  mMediaPlayer.setOnCompletionListener(new OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer arg0) {
      mMediaPlayer.release() ;
    }
  }) ;
  mMediaPlayer.setOnErrorListener(new OnErrorListener() {
    @Override
    public boolean onError(MediaPlayer arg0, int arg1, int arg2) {
      mMediaPlayer.release() ;
      return false;
    }
  }) ;
mMediaPlayer.start() ;