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我创建了一个用于在特定日期和时间显示通知的类。这是用于创建通知的类的源代码：

public class TimeAlarm extends BroadcastReceiver {

    public static NotificationManager mNotificationManager;
    public static int SIMPLE_NOTFICATION_ID = 0;



    @Override
    public void onReceive(Context context, Intent intent) {
        mNotificationManager = (NotificationManager) context
                .getSystemService(Context.NOTIFICATION_SERVICE);
        CharSequence from = "Scheduled Training";
        CharSequence message = "Please attend the scheduled training";

        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, TextToSpeechScreen.class), 0);

        //OLD CODE

        Notification notifyDetails = new Notification(R.drawable.ic_launcher,
                "Barclays Scheduled Training", System.currentTimeMillis());

        notifyDetails.setLatestEventInfo(context, from, message, contentIntent);
        notifyDetails.flags |= Notification.FLAG_AUTO_CANCEL;
        // Play default notification sound
        notifyDetails.defaults |= Notification.DEFAULT_SOUND;

        // Vibrate if vibrate is enabled
//      notifyDetails.defaults |= Notification.DEFAULT_VIBRATE;

        mNotificationManager.notify(SIMPLE_NOTFICATION_ID, notifyDetails);
    }
}

这是我从活动中调用以在特定时间设置通知的方法：

// setting alarm

    public void setOneTimeAlarm() {

        // the time set
        Calendar calendar = GregorianCalendar.getInstance();


        // calendar.setTime(model.getStartDate());
        calendar.setTime(new Date());
        calendar.set(Calendar.HOUR_OF_DAY, model.getStartTimeHour());
        // calendar.set(Calendar.HOUR_OF_DAY, 10);
        calendar.set(Calendar.MINUTE, model.getStartTimeMinutes());
        // calendar.set(Calendar.MINUTE, 53);
        calendar.set(Calendar.SECOND, 0);

        Intent intent = new Intent(this, TimeAlarm.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
                intent, count);
        am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                pendingIntent);


    }

一切正常，现在我需要在TimeAlarm类中实现服务，以便可以从后台进程触发通知。我应该如何实现这个？是否可以使用后台进程发送通知？提前致谢！

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