B4J Tutorials

Java Security

In the last years there were many reports in the media about Java security. All these security issues are related to vulnerabilities that allow the process to exit the sandbox boundaries.

These...
 
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[ABMaterial] Calling MySQL PHP scripts with OkHttp

Wow...

In my quest to replicate my android app to ABMaterial framework, just managed to execute my php scripts that access mysql db directly from my experiment web app.

Check this out......
 
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SQL Tutorial

B4J jSQL library is similar to Basic4android SQL library.

This tutorial will cover the differences between the two libraries. You can read more about the library methods here...
 
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[Pen&Paper] with Source Code Preview

Hi there

I have been working on a helper tool for ABMaterial as discussed in this post.

One of the most amazing feautures that have been added now is the ability to see the source code...
 

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[server] Http/2 Configuration

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  • Http2.zip
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[ABMaterial] 2.0 introducing B4JS

This post is no longer valid! B4JS has been rewritten from the ground up and will first introduced in In ABM 4.25. Stay tuned......
 
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[RPI] DS18b20 Temp. Sensor HowTo

Hello,

today i will share my Experience with the DS 18B20 Temperature Sensor.
The first step is to prepare the Raspberry PI.
edit the file:
B4X: 
sudo nano /boot/config.txt

insert the following...
 
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CSS Example

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  • CSSExample.zip
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Using external CSS file to style a ToggleButton

Tried
B4X: 
aToggleButton.Style=":selected{-fx-background-color:black;}"
Not working for me. Any advice?
Furthermore, how can I relate the style of a node created by code with a css file?
 
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B4J Educational Video Series

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...
 
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[ABMaterial] and Chartist (charts)

Visualizing data can be accomplished in many ways.
Here, we are using a chart to graphically depict two elements of a larger dataset - Speed and RPM of a vehicle.

Initially, I tried to store...
 
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[ABMaterial] Showcase (one to many table relation)

This example shows a Master (Vehicle ID) - detail (Group ID) - detail (Item id)
The fixed footer controls the Master grid (VEHICLE). Each detail is based on the...
 
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[ABMaterial] New component ABMPivotTable in 1.08

ABMPivotTable allows the user to view data in a dynamic pivot table. It can answer quick questions that are e.g. not findable in a report. Note that it can only handle a couple of thousand...
 
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B4J documentation page

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[ABMaterial] Firebase Storage in 1.20

The next service you can use in WebApps using ABMaterial 1.20: Storage. With storage you can upload/download files with ease. Here is an example using it together with the new ABMFileInput...
 
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[ABMaterial] 1.09 all about flexibility

This is the first of a two part tutorial on some big changes I'm making to ABMaterial in 1.09. It should be fully backwards compatible so no (or very, very little) changes will be needed from...
 
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[IoT][ESP8266]B4J/B4A/B4i & ESP8266 Basic: Example thread

What is a ESP8266?

It's a small Basic programmabe microcontroller with Wifi, TCP/IP stack plus server, GPIO's and... it's unbelievable cheap. For about 3€ you get it as a bulk version which you...
 
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[server] Automatic Reconnecting WebSocket

When working with WebSocket handlers the client maintains an online connection. The connection is expected to be kept alive for as long as needed.

However there are cases where the connection can...
 

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  • GuessMyNumberWithReconnection.zip
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[Server] Building web servers with B4J

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  • ServerHelloWorld.zip
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B4A, B4i, B4J and B4r API documentation - B4X Object Browser

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