Android Show Notification with NotificationCompat

MainActivity.java

createNotification(Calendar.getInstance().getTimeInMillis(), "hey!");
    public static final String NOTIFICATION_DATA = "NOTIFICATION_DATA";
    private void createNotification(long when, String data){
        String notificationContent ="Notification Content Click Here to go more details";
        String notificationTitle ="This is Notification";
        //large icon for notification,normally use App icon
        Bitmap largeIcon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
        int smalIcon =R.drawable.ic_launcher;
        String notificationData="This is data : "+data;

		/*create intent for show notification details when user clicks notification*/
        Intent intent =new Intent(getApplicationContext(), MainActivity.class);
        intent.putExtra(NOTIFICATION_DATA, notificationData);

		/*create unique this intent from  other intent using setData */
        intent.setData(Uri.parse("content://" + when));
		/*create new task for each notification with pending intent so we set Intent.FLAG_ACTIVITY_NEW_TASK */
        PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent, Intent.FLAG_ACTIVITY_NEW_TASK);

		/*get the system service that manage notification NotificationManager*/
        NotificationManager notificationManager =(NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);

		/*build the notification*/
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(
                getApplicationContext())
                .setWhen(when)
                .setContentText(notificationContent)
                .setContentTitle(notificationTitle)
                .setSmallIcon(smalIcon)
                .setAutoCancel(true)
                .setTicker(notificationTitle)
                .setLargeIcon(largeIcon)
                .setContentIntent(pendingIntent);

		/*Create notification with builder*/
        Notification notification=notificationBuilder.getNotification();

		/*sending notification to system.Here we use unique id (when)for making different each notification
		 * if we use same id,then first notification replace by the last notification*/
        notificationManager.notify((int) when, notification);
    }