在Android中常见的几种刷新方式有 Timer，Alarm和handler。在widgetapp更新中，alarm用的比较多，有人讲用alarm比较省电。但笔者使用后发现用alarm有时候反而会使系统反应变慢了。更好的方法推荐使用handler。第一种：TimerTimer这种方式最为常见，起个定时刷新的任务，不用的时候cancel掉，置为空即可。示例代码：Timer timer = new Timer( );TimerTask task = new TimerTask( ) {public void run ( ) {Message message = new Message( );message.what = 1;handler.sendMessage(message);}};final Handler handler = new Handler( ) {public void handleMessage(Message msg) {switch (msg.what) {case 1:log.e("Timer","Timer");update( );break;}第二种：Alarm示例代码：开始计时Intent intent = new Intent(widgetUpdate);refreshIntent = PendingIntent.getBroadcast(pContext, 0, intent, 0);alarm = (AlarmManager)pContext.getSystemService(Context.ALARM_SERVICE);alarm.setRepeating(AlarmManager.RTC, 0, 1000, refreshIntent);//每秒刷新1次停止计时if (alarm!=null) {alarm.cancel(refreshIntent);refreshIntent.cancel();refreshIntent = null;alarm = null;}第三种：handlerprivate Handler handler = new Handler();private Runnable runnable = new Runnable() {public void run () {update();handler.postDelayed(this,1000);}};开始计时handler.removeCallbacks(runnable);handler.postDelayed(runnable,1000);停止计时handler.removeCallbacks(runnable);第三种代码看起来也非常的简洁，推荐使用。
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