Question

I need to create reminder application based on the date and time from the database (Eg:31-08-2011 10:30,05-09-2011 14:40,etc.. )even if the app is not running.. Database will contain many dates with times. If the time reaches i need to display the notificaiton.How can I do that. Please provide any samples or suggestions

Answer 1

You should use AlarmManager for this.

AlarmManager mgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent i = new Intent(context, OnAlarmReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, 
SystemClock.elapsedRealtime(), PERIOD, pi);

where the PERIOD is your time to something that should be executed in OnAlarmReceiver.
And then, just implement method in

@Override
public void onReceive(Context context, Intent intent) {
    NotificationManager nm = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
    Notification notification = new Notification();
    notification.tickerText = "10 Minutes past";
    nm.notify(0, notification);
}

And also see here,

http://developer.android.com/reference/android/app/AlarmManager.html

Edit: A minor code issue fixed!