B4J Tutorials

The next version of BANano (7) will have the ability to run Cron jobs!

A Cron is Timer like functionality that runs a certain job automatically at a specified time following a predifined...

 

BANanoRouter is a full blown Router with paths that will be standard included in the next release of BANano. It allows you to better organize your code in a PWA/SPA WebApp. It is based on the...

 

The next release of BANano will have the possibility to use background workers in your WebApps. It can not be added in a BANanoLibrary, so it must be done in your final project. Background...

 

*** Contents ***
Intro
Acknowledgements
Disclaimer
Environment
Conventions used in this post
Making it work
Compiling and running your programs
A semi-automated way to get your B4J UI...

 

Please start with this tutorial: https://www.b4x.com/android/forum/threads/nlp-sentiment-analysis.133922/
It is quite similar.

In this tutorial we will try to detect whether...

 

The "sentiment" feature in the example project, uses NLP document categorizer feature to find whether the text is negative or positive.
The dataset for the model contains movie...

 

When my assumptions are challenged I listen.
We all know Public variables and subs in a class are available to procedures external to the class.
But recently I learned from @LucaMs that...

 

Hello.
Namecheap.com is probably known to many as a domain provider. You can buy an interesting domain for our project for pennies. Some time ago I put my own small OpenMediaValue server on...

 

Add to B4XMainPage:

Type PagePosition (Left As Int, Top As Int, Width As Int, Height As Int, IsIconified As Boolean)
Private kvs As KeyValueStore

And:

Public Sub SavePagePosition (Page...

 

Upgrading from a non-tls connection to a tls connection only makes sense when dealing with a protocol that specifically requires it. It is much simpler and also a bit more secure to start with a...

 

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...

 

I was making the switch from Java 8 to Java 11 and wanted to use the 'Integrated B4JPackager11' as explained by @Erel in...

 

Hi,

I had to make my application (PostChat) available on MacOs. I had no problems porting the app to Linux, but I found the port to MacOs very annoying, and had lots of issues. So I'm posting...

 

This is a very quick tutorial on the H2 database - https://www.h2database.com/html/main.html

The main features of H2 are:

• Very fast, open source, JDBC API
• Embedded and server...

 

For Mac
as already suggested by the good @KMatle

I needed to remove the Packager property (The B4J-packager does it on it's own with the new version)

Note 1*

'#PackagerProperty...

 

In B4XPages we rely heavily on tags to identify UI elements. Yet tags are valuable for connecting data to the UI, too, and it is easy to feel we are wasting tags for identification.
There is a...

 

Ola

I just spent some time nearly sweating as to why my app was not working properly. Turns out that my element names are not unique and as such a conflict arose.

Background...

 

Ola

I use a lot of parseInt and parseFloat when I code because even when I define the variables as Int, Double, Float etc, somewhere somehow mistakes happen, you find your app not working and...

 

This example visualizes the data from: https://ourworldindata.org/coronavirus-source-data
As the CSV data is quite large, a...

 

XLUtils v2.02 adds support for urls, bookmarks and page breaks.

A paragraph tag with the PageBreak attribute will start on a new page.

$"[p PageBreak=True]This will appear...