我想创建一个使用Android的通知管理器一个通知，但诀窍是，我想要的通知显示30天以后。在我的code我这样做：

 意图notificationIntent =新的意图（这一点，MyClass.class）;
PendingIntent contentIntent = PendingIntent.getActivity（此，0，notificationIntent，0）;
时长= System.currentTimeMillis的（）+（30 * 24 * 3600 * 1000）;
通知通知=新的通知（R.drawable.some_image，冠军的时候）;
notification.setLatestEventInfo（getApplicationContext（），你迟到了，有些说明，contentIntent）;
NotificationManager纳米=（NotificationManager）getSystemService（NOTIFICATION_SERVICE）;
nm.notify（NOTIFY_ATTEND_ID，通知）;
 

不过，该通知仍然显示瞬间。从我读，在何时参数来通知构造函数只用于在状态的通知进行排序。反正是有在未来某一日期/时间作出通知显示在？提前致谢。

反正是有在未来某一日期/时间作出通知显示在？

没有。

由于Falmarri建议，您将需要处理这个自己，虽然我不同意他的做法。您将需要使用 AlarmManager 。不过，我怀疑 AlarmManager 工作30天工期，但你可以试试。您可能需要使用 AlarmManager 为每天/每周的任务，通过不同的报警来安排当天的/周的通知。您还需要重构这个名册报警上重新启动，因为他们得到消灭，因为Falmarri建议。

I am trying to create a Notification using Android's Notification Manager, however, the trick is that I want the notification to show up 30 days in the future. In my code I'm doing this:

Intent notificationIntent = new Intent(this, MyClass.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
long when = System.currentTimeMillis() + (30 * 24 * 3600 * 1000);
Notification notification = new Notification(R.drawable.some_image, "A title", when);
notification.setLatestEventInfo(getApplicationContext(), "You're late", "Some description", contentIntent);
NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
nm.notify(NOTIFY_ATTEND_ID, notification);

However, the notification is still showing up instantaneously. From what I read, the "when" parameter to the Notification constructor is only used to sort the notifications in the StatusBar. Is there anyway to make the notification show up in at a future date/time? Thanks in advance.

Is there anyway to make the notification show up in at a future date/time?

No.

As Falmarri suggests, you will need to handle this yourself, though I disagree with his approach. You will need to use AlarmManager. However, I am skeptical that AlarmManager will work for 30-day durations, though you can try it. You may need to use AlarmManager for a daily/weekly task to schedule that day's/week's notifications via separate alarms. You will also need to reconstitute this roster of alarms on a reboot, since they get wiped, as Falmarri suggests.