B4J Tutorials

Using a CDN (Content Delivery Network) for your WebApp can be very beneficial:

The Benefits of using a CDN:

• Different domains. Browsers limit the number of concurrent...

 

ABMaterial For Dummies​

This has often been asked for - so it is high time to produce a simple set of guidelines to help get you across the short...

 

This is the B4J version of this B4A example: Network + AsyncStreams + B4XSerializator
Note that B4XSerializator is cross platform, so it should be simple to use similar code to communicate...

 

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 "My B4J Packager" started as the B4Jpackager provided by Erel. I have added the text entry fields for the extra things like, Menu Group, JavaVM Options (to set memory requirements)...

 

Objectives
Create an ABM custom component to display line and bar charts.

The custom component build, CustomChartJS, is a minimal solution based upon the Chart.js project...

 

Article 1: Generic Excel Importer Class for your ABMUpload component

For my ABMaterial App, I needed a Ms Excel worksheet importer, so I decided to build one.

For this, you will need the...

 

Here is a port of the code presented as a tutorial here: https://medium.com/programmers-bloc...chain-java-tutorial-from-scratch-6eeed3cb03fa

It includes examples of...

 

Ola

What is an audit trail? As per Wikipedia...

An audit trail (also called audit log) is a security-relevant chronological record, set of records, and/or destination and...

 

After (unfortunately) having write many functions (in a code module in my b4j server project) which access a MySql, I remembered a fundamental rule: use Try-Catch when accessing external...

 

Hi there...

This is a continuation of my previous posts about dynamic charts and dynamic sidebaritems. My next challenge was to use the already existing MS Excel templates for reporting, inside...

 

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...

 

A standard SQL insert in B4J may look something like this:

 Dim InsertCustomerSQL As StringBuilder
   Dim InsertValues As List
   Dim InsertID As Long
   Dim RS As ResultSet...

 

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...

 

Hi,

As I wanted to post messages to Twitter within my B4J app I couldn't find any Twitter library's (or code) to use with B4J, so I created this small library to allow me to tweet messages to...

 

Ola

Well, this is not related to ABM per se, but due to the fact that I wanted to package an ABM app for distribution for users to use in in their computers without the need of an internet...

 

New video tutorial:


Resumable subs is a new feature added in B4J v5.50 / B4i v4.00 / B4A v7.00. It dramatically simplifies the handling of asynchronous tasks.
(This feature is a...

 

Edit: It seems like there is an issue with Http/2 enabled with Conscrypt (https://github.com/eclipse/jetty.project/issues/2342). For now it is recommended to use Java 9+ without...

 

The official charts library of ABMaterial is Chartist, but because of its many features it is also a rather slow rendering js/css library and not always that easy to implement. @Mashiane...

 

PrintHtml is a Windows utility that prints html files. You can see more information about it here: http://www.b4x.com/android/forum/threads/print-with-printhtml-tool.35492/

In this example...