B4J Tutorials

For new projects it is recommended to use B4XSerializator instead of this solution.

AsyncStreamsObject allows you...

 

I got my mitts on this IR remote controller gadget: https://www.aliexpress.com/item/1005005772315510.html What's unusual about this one, is that it comes pre-flashed with Tasmota, which...

 

B4x Object Browser supports B4J and is free.

https://www.b4x.com/android/forum/t...r-api-documentation-b4x-object-browser.25682/

 

New tutorial based on Java 11: Raspberry Pi with Java 11

The first step is to download and run B4J-Bridge: Remote debugging with B4J-Bridge


Raspberry Pi is a low-cost...

 

Here's a really simple demonstration of connecting an Arduino Uno to an app written in B4J.

You will need to modify the code around line 25 to reflect the correct COM Port that your Arduino is...

 

This guide is obsolete ! It is no more updated.
Please use the B4X Booklets.

Here is a Beginner's Guide in pdf format.
The source code for the example programs is included.

All...

 

This example is similar to the previous example...

 

v10.0 - October 16, 2023 - https://www.b4x.com/android/forum/threads/b4j-v10-0-is-available-for-download.155241/

• Code snippets...

 

Ola

UOEProcess.Show

As per subject matter, this intends for anyone to be able to do an analysis of their code execution using UOEProcess.Show.

By simply logging and then pasting the...

 

In this tutorial you can learn how to make a codeviewer application.
The application uses a webview for the viewing part and a textarea for the search part.
In the webview the code is presented...

 

You can find the documentation page here: http://www.b4x.com/b4j/documentation.html

Note that the documentation is not yet complete.

 

Edit: Most updated instructions are available here: https://www.b4x.com/b4j.html

 

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...

 

As a helper to get started with B4J, some classical HelloWorld type of apps.
B4J offers many solutions in the way an app(lication) can be developed.

Status: 20150502

Below examples...

 

Hi All,

I went to use Rob's B4J How To's info (https://www.b4x.com/android/forum/threads/b4j-howtos.36350) and found like a few others that it wouldn't work in my web browser.

So I wrote a...

 

Dear All,

While learning and exploring B4J, captured B4J HowTos. The B4J HowTos are either from own experience or inspired by hints from the B4J forum (Thanks to All!).

Please note, due to...

 

Hi, today I have lost some time testing a B4j server app in a VPS, my app was supposed to help upload big files to the server. Locally, everything was working as expected, but when I have...

 

hi,

After few adjustments B4J works fine on Ubuntu.
See picture;-)

If you want, I'll write a tutorial in french.
Looking for a translator .... If someone want it!

see you soon.

 

In my search for a good PDF file viewer in B4J i came across a few examples.
DonManfred wrote a PDFBox (2.0.17) wrapper. Spsp wrote a ‘clsPDFViewer’.
The thread from knutf...

 

I found this benchmark that tests the same algorithm in multiple programming languages and decided to test it in B4J.

I've implemented the two algorithms.

Sub Process_Globals

End Sub...