B4J Tutorials

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...

 

ABMFileManager is a new component in the upcoming ABM 4.25 to manage files on your server (where the .jar file runs), but is not limited to the www folder. This feature makes it very useful on...

 

Ola

Been looking for this like forever...

Usage:

MashSpeak(page,"I have been developing A.B.M. web apps for a while now. It's an enjoyable experience.",0.7)

Sub MashSpeak(pg As...

 

Ola...

I have created an RC(2,1) and page.Cell(2,1).SetFixedHeightFromBottom(20, False)

The height of my ABMGoogleMap is 500 (int) however I want it to fit the whole RC, taking the whole page...

 

Attached you find an example of accessing a jRDC2 server. This is a conversion of the DBUtils example program (here...

 

Ola

Some thoughts are running in my head about implementing this for my color coded events management. So we have 21 colors. So me thinks a 7 row, 3 columns grid will do.

Sub...