B4J Tutorials

Hi Fam

Ensure you create credentials to login to your HiveMQ account.

You get your TSL WebSocket URL which is like..

104bbaaaa07a4293456e659cf91023.s1.eu.hivemq.cloud:8884/mqtt

...

 

Hi all,

this is the second part of WebGL library physics engines demos.

Before compile it, you have to download the Resources1.zip file, rename it to Resources.zip
and put it in the...

 

Hi Fam

The EasyMDE allows one to have a MarkDown Editor within their app. This is based on this GitHub.

One is able to create Markdown documents and save and retrieve them. The nice thing...

 

Hi Fam

I wanted to sign PDF documents in my product. So.. I used the PDF-LIB for this.

1. I designed a screen to enter the signature and initials.

2. The canvas we use...

 

Hi there, it's a pleasure to get this working...

My jFreeTTS is a library that I've just managed to cook for text to speech using the FreeTTS library.

1. Download the FreeTTS...

 

Hi Fam

This has been one of those components that I postponed to do. The creator of MathJS, a javascript library that I have been using for a while, also created a JSON Editor. I decided to...

 

Hi Fam

With SithasoDaisy5, you have the capability to view JSON files as dynamic trees. This is wrapping this Github project.

The code is as simple as feeding the component...

 

Hi Fam

With SithasoDaisy5, you will be able to create Organograms / Family Trees. Drop a SDUI5TreeSpider on your form and whala!

This is wrapped from this GitHub Project

...

 

Hi Fam

Before you start this tutorial, please ensure that your dev environment is setup by following this tutorial...

 

pyvips is a very powerful image manipulation library. It can manipulate very large images. I've created a modified "HugeImageView" based on it as an example. It can show 1-2 GB images...

 

First post, first issue:
I'm in the process of developing an ABM application. For testing purposes, I uploaded the application on my test server. The application may start fine, but when loading...

 

PyBridge is a framework that allows accessing Python libraries from within B4J.

It works by starting a Python process that connects to the B4J process. The Python process receives commands from...

 

Hi all,

here a simple shooter game using B4J WebGL libary and cannon.js physic engine.

Note that really I use cannon-es that is a port of cannon.js to use inside Javascript ES6 modules.

Note...

 

PyBridge must be accessed from a single thread. In server solutions, each handler runs in its own thread so we need to add some barriers to ensure proper usage.

The way to implement it is by...

 

This sophisticated project does one thing - the user clicks on a hardware button, connected to the RPi, and a notification appears on the PC.

The setup:
RPi running Mosquitto broker...

 

Hi all,

this code will show how to make a simple 3D game, with gravity and collisions by code without use any physics engine.

I want to remember that with WebGL library you can use more than one...

 

Hi there

NB: Where possible, please include a simple project that demonstrates your use case.

Do you have any questions about SithasoDaisy UI Toolkit?

You can shoot it here...

 

Getting the RPi 5 to work with B4J is very simple.

I've tested it with the recommended 64 bit Raspbian OS (bookworm).

1. Download and unpack the Linux ARM Full JDK (21)...

 

NOTE: This isnt recommened for everyone, this is just something that works for me. Removing support for specific platforms could cause your app to stop working.

I use SQLite for a lot of...

 

I've posted in the past a few examples of a simple chat app based on BLE: https://www.b4x.com/android/forum/threads/ble-chat-connecting-android-and-ios.66543/#content
A new version of this...