如何在Android中仅触发一次警报？

问题描述：

我设置了一个警报，当用户登陆某个特定活动时，该警报会在特定时间后触发。
如何检查此警报是否已触发，以便用户返回到该活动时不会再次设置该警报？
我只能阻止已设置但未通过此方式触发的警报再次设置：

I set an alarm when the user lands on a certain activity, which is triggered after a certain time. How can I check if this alarm has already been triggered or not, so that it doesn't get set again if the user goes back to this activity ? I can only prevent the alarm getting set again if it's already scheduled but not triggered with this :

alarmIntent = PendingIntent.getBroadcast(context, requestCode, intent, PendingIntent.FLAG_NO_CREATE);
    if (alarmIntent != null) {
        // Alarm is already set
        return;
    }
    alarmIntent = PendingIntent.getBroadcast(context, requestCode, intent, 0);

但是如果已经触发，则此方法不起作用，因为警报将在以后删除，因此 alarmIntent 将为 null

But this does not work if it's already triggered, as the alarm will be deleted afterwards so alarmIntent will be null

答

您可以使用共享的首选项来检查是否已设置。

You can make use of shared preferences to check whether it is set or not.

if(!setFlag)
{
    Intent myIntent = new Intent(FirstActivity.this, LogoutService.class);
    pendingIntent = PendingIntent.getService(FirstActivity.this, 0, myIntent, 0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.add(Calendar.MINUTE, 10); //Minutes
    alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
}

如何在Android中仅触发一次警报？

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