How To Start Notification On Custom Date&time?

I know how to start a notification X milliseconds after some click event. A code like this Timer timer = new Timer(); TimerTask timerTask = new TimerTask() {

Solution 1:

I think that the best way will be to create a service that sets the notification and then activate the service using an AlarmManager.
Here is my code for doing that. That's the code for the AlarmManager:

private void startAlarm() {
    AlarmManager alarmManager = (AlarmManager) this.getSystemService(this.ALARM_SERVICE);
    Calendar calendar =  Calendar.getInstance();
    calendar.set(int year, int month, int date, int hour, int minute, int second);
    long when = calendar.getTimeInMillis();         // notification time
            Intent intent = new Intent(this, ReminderService.class);
            PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, 0);
            alarmManager.set(AlarmManager.RTC, when, pendingIntent);
        }

Here is the Service:

public class ReminderService extends IntentService {
    private static final int NOTIF_ID = 1;

    public ReminderService(){
        super("ReminderService");
    }

    @Override
      protected void onHandleIntent(Intent intent) {
        NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        long when = System.currentTimeMillis();         // notification time
        Notification notification = new Notification(R.drawable.icon, "reminder", when);
        notification.defaults |= Notification.DEFAULT_SOUND;
        notification.flags |= notification.FLAG_AUTO_CANCEL;
        Intent notificationIntent = new Intent(this, YourActivity.class);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent , 0);
        notification.setLatestEventInfo(getApplicationContext(), "It's about time", "You should open the app now", contentIntent);
        nm.notify(NOTIF_ID, notification);
    }

}