java - 检查 AlarmManager 任务是否正在进行

Question

我正在使用 AlarmManager 运行定期后台任务:

AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 10 * 60 * 1000, pendingIntent);

我放了一个标志 PendingIntent.FLAG_UPDATE_CURRENT，但我担心如果我再次运行这段代码它会重新编写我的日程安排。问题:

• 是否会重置时间，我必须等待 10 分钟才能收到事件？
• 有没有办法检查我是否设置了闹钟任务计划？

Answer 1

Will it reset the time and I'll have to wait for 10 mins to receive an event?

是的，会的。根据文档:

If there is already an alarm scheduled for the same IntentSender, it will first be canceled.

根据

Is there a way to check if my alarm task schedule is set?

是的，there is几个解决方案，您可以检查。

另外，请注意 setRepeating 是不准确的。

Note: as of API 19, all repeating alarms are inexact. If your application needs precise delivery times then it must use one-time exact alarms, rescheduling each time as described above. Legacy applications whose targetSdkVersion is earlier than API 19 will continue to have all of their alarms, including repeating alarms, treated as exact.