blocks|key|1297974|text|当涉及到AlarmManager时，“一些示例代码”并不是那么容易。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1297975|下面是显示AlarmManager设置的代码片段|1297976|AlarmManager+mgr=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent+i=new+Intent(context,+OnAlarmReceiver.class);
PendingIntent+pi=PendingIntent.getBroadcast(context,+0,+i,+0);

mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,+SystemClock.elapsedRealtime(),+PERIOD,+pi);|code-block|syntax|javascript|1297977|在本例中，我使用的是setRepeating()。如果你想要一个一次性的警报，你可以直接使用set()。请确保在set()的初始参数中使用的相同时基上提供警报开始的时间。在上面的例子中，我使用的是AlarmManager.ELAPSED_REALTIME_WAKEUP，所以我的时基是SystemClock.elapsedRealtime()。|1297978|展示这项技术的Here+is+a+larger+sample+project。|1297979|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/commonsguy/cw-omnibus/tree/master/AlarmManager/Scheduled^0|4|C|0|5|C|0|0|A|E|1A|5|1K|5|2Q|10|3Y|T|0|7|V|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|Q|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

"Some sample code" is not that easy when it comes to <code>AlarmManager</code>.

Here is a snippet showing the setup of <code>AlarmManager</code>:

<pre><code>AlarmManager mgr=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent i=new Intent(context, OnAlarmReceiver.class);
PendingIntent pi=PendingIntent.getBroadcast(context, 0, i, 0);

mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), PERIOD, pi);
</code></pre>

In this example, I am using <code>setRepeating()</code>. If you want a one-shot alarm, you would just use <code>set()</code>. Be sure to give the time for the alarm to start in the same time base as you use in the initial parameter to <code>set()</code>. In my example above, I am using <code>AlarmManager.ELAPSED_REALTIME_WAKEUP</code>, so my time base is <code>SystemClock.elapsedRealtime()</code>.

<a href="https://github.com/commonsguy/cw-omnibus/tree/master/AlarmManager/Scheduled" rel="noreferrer">Here is a larger sample project</a> showing this technique.

blocks|key|1298009|text|当您想要从Alarmmanager调用服务时，一些示例代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298010|PendingIntent+pi;
AlarmManager+mgr;
mgr+=+(AlarmManager)ctx.getSystemService(Context.ALARM_SERVICE);
Intent+i+=+new+Intent(DataCollectionActivity.this,+HUJIDataCollectionService.class);++++
pi+=+PendingIntent.getService(DataCollectionActivity.this,+0,+i,+0);
mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,+SystemClock.elapsedRealtime()+,+1000,+pi);|code-block|syntax|javascript|1298011|您不必询问用户权限。|1298012|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Some sample code when you want to call a service from the Alarmmanager:

<pre><code>PendingIntent pi;
AlarmManager mgr;
mgr = (AlarmManager)ctx.getSystemService(Context.ALARM_SERVICE);
Intent i = new Intent(DataCollectionActivity.this, HUJIDataCollectionService.class); 
pi = PendingIntent.getService(DataCollectionActivity.this, 0, i, 0);
mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() , 1000, pi);
</code></pre>

You dont have to ask userpermissions.

blocks|key|1298059|text|我想发表评论，但<50个代表，所以这里。友好的提醒，如果你在5.1或更高版本上运行，并且你使用的时间间隔不到一分钟，就会发生这种情况：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298060|Suspiciously+short+interval+5000+millis;+expanding+to+60+seconds|code-block|syntax|javascript|1298061|参见here。|offset|length|1298062|entityMap|0|LINK|mutability|MUTABLE|url|https://code.google.com/p/android/issues/detail?id=161244^0|0|0|2|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I wanted to comment but &lt;50 rep, so here goes. Friendly reminder that if you're running on 5.1 or above and you use an interval of less than a minute, this happens:

<pre><code>Suspiciously short interval 5000 millis; expanding to 60 seconds
</code></pre>

See <a href="https://code.google.com/p/android/issues/detail?id=161244" rel="nofollow">here</a>.

blocks|key|1298094|text|AlarmManager用于在特定时间触发某些代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298095|要启动Alarm+Manager，您需要首先从系统获取实例。然后传递将在您指定的将来时间执行的PendingIntent|1298096|AlarmManager+manager+=+(AlarmManager)+getSystemService(Context.ALARM_SERVICE);

Intent+alarmIntent+=+new+Intent(context,+MyAlarmReceiver.class);
PendingIntent+pendingIntent+=+PendingIntent.getBroadcast(context,+0,+alarmIntent,+0);
int+interval+=+8000;+//repeat+interval
manager.setInexactRepeating(AlarmManager.RTC_WAKEUP,+System.currentTimeMillis(),+interval,+pendingIntent);|code-block|syntax|javascript|1298097|使用Alarm+Manager时需要小心。正常情况下，警报管理器不能在一分钟前重复。同样在低功耗模式下，持续时间可以增加到最多15分钟。|1298098|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

An AlarmManager is used to trigger some code at a specific time.

To start an Alarm Manager you need to first get the instance from the System. Then pass the PendingIntent which would get executed at a future time that you specify

<pre><code>AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

Intent alarmIntent = new Intent(context, MyAlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, alarmIntent, 0);
int interval = 8000; //repeat interval
manager.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);
</code></pre>

You need to be careful while using the Alarm Manager.
Normally, an alarm manager cannot repeat before a minute. Also in low power mode, the duration can increase to up to 15 minutes.

I need to trigger a block of code after 20 minutes from the <code>AlarmManager</code> being set.

Can someone show me sample code on how to use an <code>AlarmManager</code> in ِAndroid?

I have been playing around with some code for a few days and it just won't work.

Android: How to use AlarmManager

我需要在设置AlarmManager的20分钟后触发一个代码块。有人能给我展示一下如何在ِ安卓系统中使用AlarmManager的示例代码吗？我已经玩了几天的代码，它就是不能工作。

问安卓:如何使用AlarmManager
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