The final look at the simple notification app

ButtonAction.java

public void sendNotification() {

        //builds the basic notification
        NotificationCompat.Builder mNotification =
                (NotificationCompat.Builder) new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_info_outline_white_24px)
                        .setContentTitle("First Notificaion")
                        .setContentText("Hi!");

        //sets the sound, vibration and other things to
        //your device's defaults
        mNotification.setDefaults(Notification.DEFAULT_ALL);

        NotificationManager mNotfMng =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        //sends the notification
        mNotfMng.notify(001, mNotification.build());
    }