B4J Tutorials

Menus in the internal designer are declared as JSON strings.

If you have never worked with the JSON format then it is a good time to learn this format. It is simple and very popular. Short...

 

Starting from B4J v3.50 the IDE includes a visual designer similar to B4A and B4i designer.
The output of the designer is a bjl file. This file can be loaded to other panes or containers with:

...

 

Time tracker example with a server component and iOS and Android client apps.
The client apps allow the employees to check in and out (based on the current status).

...

 

It is recommended to use B4JPackager11: Integrated B4JPackager11 - The simple way to distribute standalone UI apps

Spoiler: Older tool

B4J Packager is a small utility that uses javapackager to...

 

This is my first attempt at B4J. Have not tried to do anything special to the layout etc. The aim was to get back the correct binary strings to draw Code11, Code39, Code93, EAN8 and EAN13 barcodes...

 

This package includes several simple examples to help developers get start with B4J.

The following examples are included:

• Hello World - One line example that prints Hello World.
• Guess...

 

The jPOI library allows you to read and write Excel workbooks: https://www.b4x.com/android/forum/t...t-excel-xls-and-xlsx-workbooks.57392/#content

The library...

 

I ran some tests to check whether the Raspberry Pi 2 can be suitable for server solutions.

The tests were similar to the tests previously done on a PC...

 

This is a simple example of a traffic light implementation using Raspberry Pi 2.

The red, yellow and green leds are connected to pins 27, 28 and 29 (see the numbering scheme...

 

This is a port of B4A GameView library and modules.

If you are not familiar with it then start with these tutorials:
https://www.b4x.com/android/forum/threads/20038/#content...

 

What is MQTT?

"MQTT is a Client Server publish/subscribe messaging transport protocol. It is light weight, open, simple, and designed so as to be easy to implement. These characteristics...

 

Please, see the following links for HD videos teaching B4J from the very beginning all the way through to a working application. The list will be updated in this first post as new videos are...

 

Here's an example B4J app which

- creates RSA Keys
- send the public key to a php script with a message
- the php will encrypt/decrypt/Send the server's keys
- concert/load the server's keys to...

 

This tutorial is about:

- Installing a brand new RaspBerry 2 (RB) (older models will do, too)
- configure WiFi on the RB
- get remote access to the RB from your PC via "Putty"
- share files...

 

During my building of a security camera for my wife's mall store and prep for projects with my personal RPi and PiFace, I quickly discovered that having a headless RPi would be nice.

What is a...

 

I've started using B4J after using B4A for a few months. What is the best structure of the code when using multiple forms. Unlike B4A where each activity has its own code, or indeed with vb.net...

 

As promised in this the B4J Training Video about the Bridge, I am attaching the scripts for running the Bridge from Mac or Raspberry Pi (Linux):

Mac:
1) Create a file called bridge.sh
2) Insert...

 

The normal postfile method just posts the file data. So you are not able to get the filename and other needed parameters. There are other examples, but sometimes you need a small solution. The...

 

Using the new jBluetooth library it is possible to communicate with Raspberry Pi devices over Bluetooth.

Bluetooth can be very useful in places where there is no local network.

The...

 

For this tutorial you will need the Pi4J library. Get it here (under Erel's video): https://www.b4x.com/android/forum/threads/iot-jpi4j-raspberry-pi-gpio-controller.37493/#content

I did...