Android的AlarmManager - 从另一个活动取消 [英] Android AlarmManager - Cancel from another Activity

问题描述

我有，我想创建一个报警器，提醒作业的用户的前一天晚上/在一定时间作业Planner应用程序。我有称为AddNewHomework一个活动是其中用户创建一个新的家庭作业项，并将其添加到数据库中。这code，然后调用。

I have a Homework Planner application which I want to create an Alarm for to remind users of the homework the night before/at a certain time. I have an Activity called AddNewHomework which is where the user creates a new homework item and it is added to the database. This code is then called.

Intent i = new Intent(this, AlarmNotificationReceiver.class);
                i.putExtra("title", title);
                PendingIntent pi = PendingIntent.getBroadcast(
                        this.getApplicationContext(), (int) id, i, 0);
                AlarmManager mAlarm = (AlarmManager) getApplicationContext()
                        .getSystemService(Context.ALARM_SERVICE);
                mAlarm.set(AlarmManager.RTC_WAKEUP,
                        System.currentTimeMillis() + 10 * 1000, pi);

这将创建这是引发在10秒内一个新的警报，并创建一个通知。

This creates a new Alarm which is triggered in 10 seconds and creates a notification.

我的问题是，我还有一个活动叫做HomeworkList其中包含一个ListView并显示所有存储在数据库中的家庭作业的。如果用户长时间点击一个，那么他们必须将其删除的选项，但是从数据库中删除它不会删除报警。

My problem is that I have another activity called HomeworkList which contains a ListView and displays all of the homeworks stored in the database. If a user long clicks on one then they have the option to delete it, however removing it from the database will not remove the alarm.

我已经看过了code，我可以用它来去除，但是我没有发现任何的报警，让我懂得如何从这种不同的活动取消报警。我知道我需要做PendingIntent的相同，但如何做到这一点，因为我无法从其他类访问上下文。 （我不认为）。

I have looked for code I can use to remove the alarm however I have not found anything that allows me to understand how to cancel the alarm from this different activity. I know that I need to make the PendingIntent's the same, but how do I do this as I cannot access the context from the other class. (I don't think).

感谢

汤姆

推荐答案

如果有帮助，你可以从另一个活动访问您的背景下，通过静态吸气当前上下文。在你的上面级，只是做一个私有字段：

If it helps, you could access your context from another activity, by making a static getter for the current context. In your above class, just make a private field:

private static Context context;

public static Context getAppContext(){
    return MyActivity.context;
}

然后，只需在onCreate方法中添加：

Then, simply add in the onCreate method a:

MyActivity.context = getApplicationContext();

这是另一项活动访问上下文现在pretty的方便。您可以使用从MyActivity检索的情况下取消报警。

Accessing the context from another activity is now pretty easy. You can use the context retrieved from "MyActivity" to cancel your alarm.

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