android 音乐播放工具类MediaPlayer

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上代码
public class Player implements OnBufferingUpdateListener, OnCompletionListener,        OnPreparedListener {    public MediaPlayer mediaPlayer; // 媒体播放器    private SeekBar seekBar; // 拖动条    private Timer mTimer = new Timer(); // 计时器    // 初始化播放器    public Player(SeekBar seekBar) {        super();        this.seekBar = seekBar;        try {            mediaPlayer = new MediaPlayer();            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);// 设置媒体流类型            mediaPlayer.setOnBufferingUpdateListener(this);            mediaPlayer.setOnPreparedListener(this);        } catch (Exception e) {            e.printStackTrace();        }        // 每一秒触发一次        mTimer.schedule(timerTask, 0, 1000);    }    // 计时器    TimerTask timerTask = new TimerTask() {        @Override        public void run() {            if (mediaPlayer == null)                return;            if (mediaPlayer.isPlaying() && seekBar.isPressed() == false) {                handler.sendEmptyMessage(0); // 发送消息            }        }    };    Handler handler = new Handler() {        public void handleMessage(android.os.Message msg) {            int position = mediaPlayer.getCurrentPosition();            int duration = mediaPlayer.getDuration();            if (duration > 0) {                // 计算进度（获取进度条最大刻度*当前音乐播放位置 / 当前音乐时长）                long pos = seekBar.getMax() * position / duration;                seekBar.setProgress((int) pos);            }        };    };    public void play() {        mediaPlayer.start();    }    /**     *      * @param url     *            url地址     */    public void playUrl(String url) {        try {            mediaPlayer.reset();            mediaPlayer.setDataSource(url); // 设置数据源            mediaPlayer.prepare(); // prepare自动播放        } catch (IllegalArgumentException e) {            e.printStackTrace();        } catch (SecurityException e) {            e.printStackTrace();        } catch (IllegalStateException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }    // 暂停    public void pause() {        mediaPlayer.pause();    }    // 停止    public void stop() {        if (mediaPlayer != null) {            mediaPlayer.stop();            mediaPlayer.release();            mediaPlayer = null;        }    }    @Override    public void onPrepared(MediaPlayer mp) {        mp.start();        Log.e("mediaPlayer", "onPrepared");    }    @Override    public void onCompletion(MediaPlayer mp) {        Log.e("mediaPlayer", "onCompletion");    }    /**     * 缓冲更新     */    @Override    public void onBufferingUpdate(MediaPlayer mp, int percent) {        seekBar.setSecondaryProgress(percent);        int currentProgress = seekBar.getMax()                * mediaPlayer.getCurrentPosition() / mediaPlayer.getDuration();        Log.e(currentProgress + "% play", percent + " buffer");    }}
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