B4J Tutorials

This is a simple example of a traffic light implementation using Raspberry Pi 2.

The red, yellow and green leds are connected to pins 27, 28 and 29 (see the numbering scheme...

 

The attached project uses inline Java code and the ITEXT library to create various types of 1D and 2D barcodes. The barcodes are store in a PDF file(s). Change the code in the B4J class or add...

 

Time tracker example with a server component and iOS and Android client apps.
The client apps allow the employees to check in and out (based on the current status).

...

 

This example is a port of the following desktop example: http://www.b4x.com/android/forum/threads/jsontree-tool-to-help-with-json-parsing-b4a-b4j.35963/...

 

Free download here

 

For this tutorial you will need the Pi4J library. Get it here (under Erel's video): https://www.b4x.com/android/forum/threads/iot-jpi4j-raspberry-pi-gpio-controller.37493/#content

I did...

 

I ran some tests to check whether the Raspberry Pi 2 can be suitable for server solutions.

The tests were similar to the tests previously done on a PC...

 

This is an old example. Better use B4XSerializator to serialize objects.

One of the nice things about using B4J server as the backend of B4A applications is that you can send and receive...

 

As promised in this the B4J Training Video about the Bridge, I am attaching the scripts for running the Bridge from Mac or Raspberry Pi (Linux):

Mac:
1) Create a file called bridge.sh
2) Insert...

 

LAMP: Linux Apache MySQL PHP

In this tutorial I will explain how to bring complete working server, on Amazon EC2 (you get 1 year free)

I am using this server for sending notification for iphone...

 

This example demonstrates how a Raspberry Pi board can be controlled from the browser.

It tracks the switches state and...

 

I've started using B4J after using B4A for a few months. What is the best structure of the code when using multiple forms. Unlike B4A where each activity has its own code, or indeed with vb.net...

 

During my building of a security camera for my wife's mall store and prep for projects with my personal RPi and PiFace, I quickly discovered that having a headless RPi would be nice.

What is a...

 

B4J v1.05 adds support for the TreeView node.

TreeView as it name suggests visualizes a tree structure.

Each item in the TreeView is a TreeItem (or CheckBoxTreeItem). Each item has a list of...

 

This is a port of B4A GameView library and modules.

If you are not familiar with it then start with these tutorials:
https://www.b4x.com/android/forum/threads/20038/#content...

 

B4J allows you to show modal dialogs or modal forms.
The difference between a modal form to non-modal form is that with a modal form the calling code will only continue after the form is closed...

 

B4J development tool is similar to Basic4android. The language and IDE are mostly identical.

The APIs (methods, keywords and libraries) are identical in some cases and different in other cases...

 

This example downloads an html page, parses it and finds the image links. It then uses a class named ImageDownloader to...

 

For new projects it is recommended to use B4XSerializator instead of this solution.

AsyncStreamsObject allows you...

 

I needed to keep two ListViews scrolling in sync, so searching the internet I found this: http://stackoverflow.com/questions/16937470/listen-to-scrollbar-change-in-listview

which I have...