multiple Notification in android

i want to create reminder application...I am using Notification Manager... I am using this line as instantiate of Notification...

long when=sdf.parse("09 06 2010 15:45:00");
Notification notifyDetails = new Notification(R.drawable.reminder_1,"Reminder",when.getTime());

I need to start the notification开发者_JAVA百科 at specified time...but here it is notification started immediately when i gave the date...and also help me to show multiple notification

The when argument is a time for the Notification which is displayed when the notification bar is in expanded view. It is not used for scheduling when the Notification is displayed.

If you want to schedule something to happen in the future try the the AlarmManager service.

String ns = Context.NOTIFICATION_SERVICE;
        NotificationManager notificationManager = (NotificationManager) getSystemService(ns);
        int icon = R.drawable.update;
        CharSequence tickerText = "assignments";
        long when = System.currentTimeMillis();

        Notification assignmentNotification = new Notification(icon, tickerText, when);
        assignmentNotification.defaults |= Notification.DEFAULT_SOUND;
        long[] vibrate = {0,100,200,300};
        assignmentNotification.vibrate = vibrate;
        Context context = getApplicationContext();
        CharSequence contentTitle = "check assignments";
        CharSequence contentText = "chek ur app for assignments ";
        Intent notificationIntent = new Intent(context, ViewAssignmentnotificationActivity.class);
        PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent,0);
        assignmentNotification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
       ** final int id = 2;

Use another "id" for multiple notifiucation...