System.currentTimeMillis();

public class TimeService extends Service {private TimeService mContext;private Timer mTimer;//定时器private long currentTimeMillis = 0;//当前时间private static final long UPDATE_TIME_OFFSET = 1 * 1000;//自动更新间隔private CheckTimeTask checkTimeTask;private UpdateTimeTask updateTimeTask;//需用内部类继承Binder,并定义方法获取Service对象private final IBinder binder = new TimeBinder();//外部调用，获取当前时间public long getCurrentTimeMillis() {return currentTimeMillis;}//初始化服务时间public void setCurrentTimeMillis(String dateStr) {if (StringUtil.isNullOrEmpty(dateStr)) {return;}try {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date date = sdf.parse(dateStr);currentTimeMillis = date.getTime();} catch (ParseException e) {e.printStackTrace();}}public class TimeBinder extends Binder {public TimeService getService() {return mContext;}}@Nullable@Overridepublic IBinder onBind(Intent intent) {return binder;}@Overridepublic void onCreate() {super.onCreate();mContext = this;initData();}private void initData() {mTimer = new Timer();checkTimeTask = new CheckTimeTask();updateTimeTask = new UpdateTimeTask(UPDATE_TIME_OFFSET);mTimer.schedule(checkTimeTask, 1000, 5 * 60 * 1000);//每5分钟更新一次网络时间mTimer.schedule(updateTimeTask, 0, UPDATE_TIME_OFFSET);}@Overridepublic void onDestroy() {super.onDestroy();if (mTimer != null) {mTimer.cancel();mTimer = null;}if (checkTimeTask != null) {checkTimeTask.cancel();checkTimeTask = null;}if (updateTimeTask != null) {updateTimeTask.cancel();updateTimeTask = null;}}/*** 获取服务器时间*/private class CheckTimeTask extends TimerTask {@Overridepublic void run() {//=========此处为获取网络时间请求========//===============================SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");if (bean != null ) {String dateStr = bean;try {Date date = sdf.parse(dateStr);currentTimeMillis = date.getTime();} catch (ParseException e) {e.printStackTrace();}}}}/*** 定时更新当前时间*/private class UpdateTimeTask extends TimerTask {/*** 更新时间间隔*/private long offset = 0;public UpdateTimeTask(long offset) {this.offset = offset;}@Overridepublic void run() {currentTimeMillis += offset;}}}