How to execute a method by clicking a notification

Use this code to execute a method by click on notification

protected void displayNotification() {
    Log.i("Start", "notification");

  /* Invoking the default notification service */
    NotificationCompat.Builder  mBuilder =
            new NotificationCompat.Builder(this);
    mBuilder.setAutoCancel(true);

    mBuilder.setContentTitle("New Message");
    mBuilder.setContentText("You've received UnRead message.");
    mBuilder.setTicker("New Message Alert!");
    mBuilder.setSmallIcon(R.drawable.icon2);

  /* Increase notification number every time a new notification arrives */
    mBuilder.setNumber(++numMessages);

  /* Creates an explicit intent for an Activity in your app */

    Intent resultIntent = new Intent(this, FreesmsLog.class);

    TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
    stackBuilder.addParentStack(FreesmsLog.class);

  /* Adds the Intent that starts the Activity to the top of the stack */
    stackBuilder.addNextIntent(resultIntent);
    PendingIntent resultPendingIntent =
            stackBuilder.getPendingIntent(
                    0,
                    PendingIntent.FLAG_UPDATE_CURRENT
            );
    mBuilder.setContentIntent(resultPendingIntent);
    mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
  /* notificationID allows you to update the notification later on. */
    mNotificationManager.notify(notificationID, mBuilder.build());

}