B4J Tutorials

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...

 

XLUtils v2.00 adds support for creating MS Word documents, and converting Word documents to PDF.
It is done in a similar way to BCTextEngine, using custom BBCode. This works...

 

Ola

As you are aware, the BANanoJsPDFAD tool is out. Its developed using jsPDF and it uses the abstract designer for you to create pdf Documents.

You can insert text, triangles, images...

 

Many years ago I needed to sniff a connection and I didn't have a free sniffer available and I didn't know how to create one .... So after a long reflection I decided to create a Proxy Server in...

 

Just a short note how my experience was migrating to JPOI5. Not worth a tutorial - more a "all easy note" when you migrate an important app (like mine which is used by a company).

I needed to...

 

Hi all,
Used to make a lottery in Telegram.
You can expand the UI of this app and use it like TV lotteries.
for example: (Be sure to watch the clip)

this zip file has a...