android 音乐播放工具类MediaPlayer

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");
    }

}