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            Intent intent=new Intent(this, RingBellActivity.class);
            LogInfo.d("alarmID="+alarmID);
            intent.putExtra("AlarmID",alarmID);
            intent.putExtra("fromNotificatin",true);
            PendingIntent pi=PendingIntent.getActivity(this,0,intent,0);
            Notification notification=new NotificationCompat.Builder(this,"alarm1")
                    .setSmallIcon(R.mipmap.ic_launcher_round)                 
   .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher_round))
                    .setContentTitle(name)
                    .setContentText(time)
                    .setContentIntent(pi)//点击结束响铃并且跳到闹钟列表页面，且页面更新
                    .build();

            notification.fullScreenIntent=pi;
            notificationManager.notify(alarmID,notification);

在上述代码中，已经给intent.putExtra(“AlarmID”,alarmID);赋值了，但是在RingBellActivity启动时，获取到的还是以前的值。最后发现是构建PendingIntent时的flag值没有设置正确。

PendingIntent pi=PendingIntent.getActivity(this,0,intent,0);

应该改为

PendingIntent pi=PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);

把最后的参数设置为 PendingIntent.FLAG_UPDATE_CURRENT，才会刷新Intent的值