How to send a Notification at a specific time?

Question

I would like to send a notification at a specific time. Below is my code. Right now, I only get a notification when I start the app, but I do not get a notification at the specified time. Could you help me understand what I am doing wrong.

 NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle("My notification")
            .setContentText("Trainieren sie jetzt!")
            .setAutoCancel(true);
    Intent resultIntent = new Intent(this, MainActivity2.class);

    AlarmManager alarmManager =(AlarmManager)getSystemService(ALARM_SERVICE);



    PendingIntent resultPendingIntent =
        PendingIntent.getActivity(
        this,
        0,
        resultIntent,
        PendingIntent.FLAG_UPDATE_CURRENT);


   Calendar cal = Calendar.getInstance();
   cal.set(Calendar.HOUR_OF_DAY, 12);
   cal.set(Calendar.MINUTE, 54);
   alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 24*60*60*1000, resultPendingIntent);



    mBuilder.setContentIntent(resultPendingIntent);
    int mNotificationId = 001;
    NotificationManager mNotifyMgr = 
            (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    mNotifyMgr.notify(mNotificationId, mBuilder.build());

Thanks for helping!

you have to set the notification where you are setting the time ... — Umair, Aug 29 '14 at 11:04
Setting a Repeating Alarm with a Broadcast receiver is not a bottle neck as far as I can think of it. Only a timer option can become highly cumbersome. If wake-locks are properly implemented within a service, it becomes all the more efficient. — Skynet, Aug 29 '14 at 11:11
Also make sure you implement this Alarm through your manifest and listen to Boot Broadcast, in that you have to set your alarm again as at turning off the device your Alarm is wiped. — Skynet, Aug 29 '14 at 11:16
You need to Display your Notifications in the onReceive method of your Alarm Class. — Skynet, Aug 29 '14 at 11:16

score 1 · Accepted Answer · edited May 23 '17 at 12:25

You need to add:

@Override
public void onReceive(Context context, Intent intent) {
    //  Toast.makeText(MainActivity.con, "Hello from alarm", 1).show(); 


    // System.out.println("Hello from Alarm");
    context.startService(new Intent(context, NotificationService.class));

}

In the above example I am directing the process to my Service class to process my notification, managing wake locks and background service implementation. If you are not implementing a Service you can just display your notifications in the onRecieve method.

Please have a look here it has a complete implementation of the Alarm Class.

How to send a Notification at a specific time?

1 Answers1