如果当天的警报时间过去,android会阻止警报服务的立即触发

Alarm Manager的参考说明了这一点

If the stated trigger time is in the past,the alarm will be triggered
immediately.

我在申请中遇到了这个问题.这是我的警报管理器代码：

Intent myIntent = new Intent(getActivity(),DinnerAlarmReceiver.class);
                pendingDinnerIntent = PendingIntent.getBroadcast(getActivity(),myIntent,0);

                Calendar calendar = Calendar.getInstance();
                calendar.set(Calendar.HOUR_OF_DAY,hourOfDay);
                calendar.set(Calendar.MINUTE,minute);

                alarmManager.set(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pendingDinnerIntent);

这个问题有解决方法吗？

– – -编辑 – – –

我写了一些代码来估计警报的设定时间是否在当前时间之前.以上部分有相应的变化：

Calendar calendar = Calendar.getInstance();
                long currentTime = calendar.getTimeInMillis();
                calendar.set(Calendar.HOUR_OF_DAY,minute);
                long setTime = calendar.getTimeInMillis();
                Timestamp setTimestamp = new Timestamp(setTime);
                Timestamp currentTimestamp = new Timestamp(currentTime);
                if (setTimestamp.after(currentTimestamp))
                {
                    alarmManager.set(AlarmManager.RTC_WAKEUP,pendingDinnerIntent);
                }
                else
                {
                }

如果setTimestamp在currentTimestamp之前,我应该怎么做alarmManager？

解决方法

您不需要创建时间戳.您可以使用日历执行此操作.

Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY,hourOfDay);
calendar.set(Calendar.MINUTE,minute);

if(calendar.before(Calendar.getInstance())) {
    calendar.add(Calendar.DATE,1);
}

alarmManager.set(AlarmManager.RTC_WAKEUP,pendingDinnerIntent);

我还要提到的是,从KitKat开始,如果你的targetSdkVersion是19或更高,则AlarmManager #set()方法并不准确.如果您希望在准确的时间触发警报,则需要使用setExact *()方法.