android 背景音乐 及音效播放工具类

public class MusicPlayer implements MediaPlayer.OnCompletionListener, MediaPlayer.OnErrorListener {     
    private Context context;     
    private MediaPlayer bgPlayer;  //播放背景音乐的播放器 
    private SoundPool actionMusicPlayer;  //播放音效的播放器 
    private int source_da,source_givecard,source_start,source_win,source_calllord;  //各种音效的source 

    public MusicPlayer(Context context) {  //初始化 
        this.context = context;     
        this.actionMusicPlayer = new SoundPool(10, AudioManager.STREAM_SYSTEM,5);  //这里指定声音池的最大音频流数目为10，声音品质为5大家可以自己测试感受下效果 
        this.source_da = actionMusicPlayer.load(context, R.raw.da, 0);     
        this.source_givecard = actionMusicPlayer.load(context, R.raw.givecard, 0);     
        this.source_start = actionMusicPlayer.load(context, R.raw.start, 0);     
        this.source_win = actionMusicPlayer.load(context, R.raw.win, 0);     
        this.source_calllord = actionMusicPlayer.load(context, R.raw.calllord, 0);     
    }     

    public void onCompletion(MediaPlayer mp) {  //音频文件播放完成时自动调用 

    }     

    public boolean onError(MediaPlayer mp, int what, int extra) {  //音频文件播放发生错误时自动调用 
        return false;     
    }     

    public void playBgSound(int paramInt) {  //播放背景音乐，paramInt为音频文件ID 
        if(!SysSetting.getInstance(context).isBgSound()) {  //SysSetting为一个单例类，是我自己定义的，用于保存本应用程序相关设置，isBgSound()为得到是否开启背景音乐设置 
            return;     
        }     

        stopSound(bgPlayer);     

        try {     
            MediaPlayer mediaPlayer = MediaPlayer.create(context, paramInt);     
            bgPlayer = mediaPlayer;     
            bgPlayer.setOnCompletionListener(this);     
            bgPlayer.setLooping(true);  //设置是否循环，一般背景音乐都设为true 
            bgPlayer.start();     
        } catch (IllegalStateException e) {     
            e.printStackTrace();     
        }      
    }     

    public MediaPlayer getBackGroundPlayer() {     
        return this.bgPlayer;     
    }     

    public void stopBgSound() {  //停止背景音乐的播放 
        if(bgPlayer == null)      
            return;     
        if(bgPlayer.isPlaying())     
            bgPlayer.stop();     
        bgPlayer.release();     
        bgPlayer = null;     
    }     

    private void playSound(int source) {  //如果系统设置中开启了音效，则播放相关的音频文件 
        if(SysSetting.getInstance(context).isEffectSound()) {     
            actionMusicPlayer.play(source, 1, 1, 0, 0, 1);     
        }     
    }     

    public void playHitCardSound() {     
        playSound(source_da);     
    }     

    public void playGiveCardSound() {     
        playSound(source_givecard);     
    }     

    public void playStartSound() {     
        playSound(source_start);     
    }     

    public void playWinSound() {     
        playSound(source_win);     
    }     

    public void playCalllordSound() {     
        playSound(source_calllord);     
    }     
}    

可以考虑自己定义一个BaseActivity，继承BaseActivity，在其中定义一个静态的成员变量并在这个BaseActivity的onCreate方法中初始化该musicPlayer