在特定时间发送给用户的通知Android

我正在尝试使用报警管理器在特定时间向用户发送通知.基本上,什么也没有发生,对我来说代码看起来不错.我的Alarm Manager的代码如下：

/** Notify the user when they have a task */
public void notifyAtTime() {
    Intent myIntent = new Intent(PlanActivity.this,Notification.class);     
    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    PendingIntent pendingIntent = PendingIntent.getService(PlanActivity.this,myIntent,0);

    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY,12);
    calendar.set(Calendar.MINUTE,17);
    calendar.set(Calendar.SECOND,00);

    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),24*60*60*1000,pendingIntent);
}

“通知”类中的通知代码如下：

public class Notification extends Service {


    @Override
    public void onCreate() {   

        Toast.makeText(this,"Notification",Toast.LENGTH_LONG).show();

        Intent intent = new Intent(this,PlanActivity.class);
        PendingIntent pending = PendingIntent.getActivity(this,intent,0);
        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
                this).setSmallIcon(R.drawable.ic_launcher)
                .setContentTitle("Football")
                .setContentText("Don't forget that you have Football planned!")
                .setContentIntent(pending);

        notificationmanager manager = (notificationmanager) getSystemService(NOTIFICATION_SERVICE);
        manager.notify(0,mBuilder.build());
    }

    @Override
    public IBinder onBind(Intent intent) {
        // Todo Auto-generated method stub
        return null;
    }
}

在Notification类中设置的Toast也不会出现.我不知道这是真的很傻,我失踪了,但任何帮助将不胜感激！

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