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    public void displayShelf(List<String> images, RecyclerView items) {

        //
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        itemWidth = getResources().getDimension(R.dimen.item_width);
        padding = (size.x - itemWidth) / 2;
        firstItemWidth = getResources().getDimension(R.dimen.padding_item_width);
        allPixels = 0;

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private void connect() {
        MqttConnectOptions connectOptions = new MqttConnectOptions();
        connectOptions.setAutomaticReconnect(true);

        client = new MqttAndroidClient(this, serverURI, clientId);
        try {
            client.connect(connectOptions, new IMqttActionListener() {
                @Override
                public void onSuccess(IMqttToken asyncActionToken) {
                    subscribe();

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private void subscribe() {
    String subscribeTopic = "inbox";
        try {
            client.subscribe(subscribeTopic, 0, new IMqttMessageListener() {
                @Override
                public void messageArrived(final String topic, final MqttMessage message) throws Exception {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(MainActivity.this, message.toString(), Toast.LENGTH_SHORT).show();

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    private void publishMessage(String message) {
        String publishTopic = "outbox";
        MqttMessage msg = new MqttMessage();
        msg.setPayload(message.getBytes());
        try {
            client.publish(publishTopic, msg);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

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<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/login_nav"
    app:startDestination="@id/loginHomeFragment">
    <fragment
        android:id="@+id/loginHomeFragment"
        android:name="me.rankov.kaboom.login.LoginHomeFragment"
        android:label="fragment_login_home"

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import 'package:flutter/material.dart';

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {