如何在非活动课使用getSystemService？ [英] How to use getSystemService in a non-activity class?

问题描述

我建立这将触发通过AlarmManager报警的应用程序。

I am building an application which triggers an alarm via AlarmManager.

我希望能够通过它自己的非活性类拨打了报警，但因为我不是延伸活动，我似乎没有任何背景。这个概念混淆了我，和我读过的SDK文档。

I would like to be able to call the Alarm via it's own non-activity class, but since I am not extending Activity, I don't appear to have any 'context'. This concept confuses me, and I've read the sdk docs.

我会如何使用：

alarmTest = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

在我的非activty类？

in my non-activty class?

另外，我假设得到上下文将允许我使用共享preFS和主意在我的非活性类呢？

Also, I'm assuming getting context will allow me to use SharedPrefs and Intents in my non-activity class as well?

推荐答案

您可以通过上下文这是preferred方式的非活性类或者你可以封装应用程序的基本背景下，以一个单身它可以让您在任何应用程序中访问上下文。在某些情况下，这可能是一个很好的解决方案，但在别人的肯定不是一个好。

You can pass the context to the non-activity class which is the preferred way or you could encapsulate the base context of the application to a singleton which would allow you to access the context anywhere within the application. At some cases this might be a good solution but in others its certainly not a good one.

无论如何，如果你想通过触发报警的 AlarmManager 我是pretty的确认报警要继承从服务或 IntentService ，在这种情况下，更好的是你必须通过 this.getBaseContext（）获取上下文或 this.getApplicationContext（）

Anyway, if you want to trigger an alarm via the AlarmManager I'm pretty sure the alarm should inherit from a Service or better yet from IntentService and in such cases you have access to the context via this.getBaseContext() or this.getApplicationContext()

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