Android(安卓)Service播放音乐

<pre name="code" class="java">/** * 音乐播放服务 * Created by Lezg on 2014/6/7. */public class PlayerService extends Service {    private final int UPDATA_CURRENT_TIME = 1;    private AppContext appContext;    private MyReceiver myReceiver;    private int curPosition = 0; //记录当前正在播放的音乐    private int currentTime; //当前播放进度    private int playMode = 0;    private boolean isPause;// 暂停状态    private String path;    private MediaPlayer mediaPlayer;    /**     * handler用来接收消息，发送广播更新歌曲已播放时间     */    private final Handler myHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            if (msg.what == UPDATA_CURRENT_TIME) {                if (mediaPlayer != null) {                    currentTime = mediaPlayer.getCurrentPosition();//当前歌曲播放时长                    AppHelper.sendBoastCast_curTime(PlayerService.this, currentTime);                    myHandler.sendEmptyMessageDelayed(1, 1000);                }            }        }    };    @Override    public void onCreate() {        super.onCreate();        appContext = AppContext.getInstance();        initRegisterReceiver();        initMedia();    }    @Override    public IBinder onBind(Intent arg0) {        return null;    }    @Override    public void onDestroy() {        unregisterReceiver(myReceiver);        if (mediaPlayer != null) {            mediaPlayer.stop();            mediaPlayer.release();            mediaPlayer = null;        }        super.onDestroy();    }    /**     * 媒体播放器初始化     */    void initMedia() {        mediaPlayer = new MediaPlayer();        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {            @Override            public void onCompletion(MediaPlayer mediaPlayer) {                switch (playMode) {                    case AppHelper.MODE_SEQUENCE:                        ++curPosition;                        if (curPosition > appContext.mp3Infos.size() - 1) {                            curPosition = 0;                            mediaPlayer.stop();                            return;                        }                        AppHelper.sendBoastCast_curPosition(PlayerService.this, curPosition);                        path = appContext.mp3Infos.get(curPosition).getUrl();                        playMusic(0);                        break;                    case AppHelper.MODE_SHUFFLE:                        curPosition = AppHelper.getRandomIndex(appContext.mp3Infos.size() - 1);                        path = appContext.mp3Infos.get(curPosition).getUrl();                        AppHelper.sendBoastCast_curPosition(PlayerService.this, curPosition);                        playMusic(0);                        break;                    case AppHelper.MODE_REPEAT:                        ++curPosition;                        if (curPosition > appContext.mp3Infos.size() - 1) {                            curPosition = 0;                        }                        AppHelper.sendBoastCast_curPosition(PlayerService.this, curPosition);                        path = appContext.mp3Infos.get(curPosition).getUrl();                        playMusic(0);                        break;                    case AppHelper.MODE_REPEATONE:                        mediaPlayer.start();                        break;                    default:                        break;                }            }        });    }    /**     * 注册广播     */    void initRegisterReceiver() {        myReceiver = new MyReceiver();        IntentFilter filter = new IntentFilter();        filter.addAction(AppHelper.MUSIC_SERVICE);        registerReceiver(myReceiver, filter);    }    /**     * 播放音乐     *     * @param currentTime 当前播放进度     */    void playMusic(int currentTime) {        try {            mediaPlayer.reset();            mediaPlayer.setDataSource(path);            mediaPlayer.prepare();            mediaPlayer.setOnPreparedListener(new PreParedListner(currentTime));            myHandler.sendEmptyMessage(UPDATA_CURRENT_TIME);        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * 暂停播放     */    void pausePlaying() {        if (mediaPlayer != null && mediaPlayer.isPlaying()) {            mediaPlayer.pause();            isPause = true;        }    }    /**     * 暂停后继续播放     */    void rePlayMusic() {        if (isPause) {            mediaPlayer.start();            isPause = false;        }    }    /**     * 实现一个OnPrepareLister接口,当音乐准备好的时候开始播放     */    private final class PreParedListner implements OnPreparedListener {        private final int currentTime;        public PreParedListner(int currentTime) {            this.currentTime = currentTime;        }        @Override        public void onPrepared(MediaPlayer mp) {            mediaPlayer.start();            if (currentTime > 0) { // 如果音乐不是从头播放                mediaPlayer.seekTo(currentTime);            }            int duration = mediaPlayer.getDuration();            AppHelper.sendBoastCast_duration(PlayerService.this, duration);        }    }    /**     * 接收MianActivity 传来的播放模式     */    private class MyReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            int mode = intent.getIntExtra("playMode", 0);            switch (mode) {                case AppHelper.MODE_SEQUENCE:                    playMode = AppHelper.MODE_SEQUENCE;                    break;                case AppHelper.MODE_SHUFFLE:                    playMode = AppHelper.MODE_SEQUENCE;                    break;                case AppHelper.MODE_REPEAT:                    playMode = AppHelper.MODE_REPEAT;                    break;                case AppHelper.MODE_REPEATONE:                    playMode = AppHelper.MODE_REPEATONE;                    break;                case AppHelper.MODE_PLAY:                    path = intent.getStringExtra("url");                    curPosition = intent.getIntExtra("curPosition", 0);                    playMusic(0);                    break;                case AppHelper.MODE_PAUSE:                    pausePlaying();                    break;                case AppHelper.MODE_CONTINUE:                    rePlayMusic();                    break;                case AppHelper.MODE_PRE:                    path = intent.getStringExtra("url");                    curPosition = intent.getIntExtra("curPosition", 0);                    playMusic(0);                    break;                case AppHelper.MODE_NEXT:                    path = intent.getStringExtra("url");                    curPosition = intent.getIntExtra("curPosition", 0);                    playMusic(0);                    break;                case AppHelper.MODE_PROGRESS_CHANGE:                    currentTime = intent.getIntExtra("progress", 0);                    playMusic(currentTime);                    break;                default:                    break;            }        }    }}
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