android 音樂播放service

package com.czp;import java.io.File;import android.app.Service;import android.content.Intent;import android.content.SharedPreferences;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.media.MediaPlayer.OnErrorListener;import android.os.IBinder;public class MusicServer extends Service implements OnCompletionListener,OnErrorListener{private MediaPlayer mp;    @Overridepublic void onStart(Intent intent, int startId) {if(!mp.isPlaying()){mp.start();}mp.setOnCompletionListener(this);mp.setOnErrorListener(this);super.onStart(intent, startId);}@Overridepublic void onCreate() {try {SharedPreferences sp = Util.getSharedPreferences(this);String userSettingMusicPath = sp.getString(Util.USER_MUSIC_PATH,"");    if(!userSettingMusicPath.isEmpty())    {    File f = new File(userSettingMusicPath);    if(f.exists())    {    mp = new MediaPlayer();    mp.setDataSource(userSettingMusicPath);    }    }    if(mp==null)    {    mp = MediaPlayer.create(this, R.raw.defaultMusicId);    }mp.prepare();} catch (Exception e) {    processError(e);}super.onCreate();}@Overridepublic void onDestroy() {mp.stop();mp.release();mp = null;super.onDestroy();}@Overridepublic IBinder onBind(Intent intent) {return super.onBind(intent);}@Overridepublic void onCompletion(MediaPlayer mp) {}@Overridepublic boolean onError(MediaPlayer mp, int what, int extra) {mp.stop();mp.release();return false;}/** * 記錄異常 * @param e */private void processError(Exception e) {}}package com.czp;import android.app.Service;import android.content.SharedPreferences;public class Util {private static final int MODE_WORLD_WRITEABLE = 0;private static final String SHAER_FILE = "userSetting";public  static final String USER_MUSIC_PATH = "userMusicPath";public  static final String USER_LAST_LOACTION="userLastLocation";public static SharedPreferences getSharedPreferences(Service server) {return server.getSharedPreferences(SHAER_FILE, MODE_WORLD_WRITEABLE);}}