B4J Tutorials

Continuing the One Page, Many Uses example, here we demonstrate how to create and collect the events raised for each Type (Employee, Vehicle, User, etc).

The module form is getting rather large...

 

You may be thinking that I create these tutorials for myself. You may be right!!!
My RAM memory is very limited. Erel has offered (us) a place to securely store them (he is so kind) for future...

 

Based on various tutorials and posts, I have made this remote control for my RPi.
Hardware required: Tablet with 1200 x 800 resolution (can be reduced by changing the layout file) and Bluetooth...

 

This tutorial is about:

- Installing a brand new RaspBerry 2 (RB) (older models will do, too)
- configure WiFi on the RB
- get remote access to the RB from your PC via "Putty"
- share files...

 

Here's an example B4J app which

- creates RSA Keys
- send the public key to a php script with a message
- the php will encrypt/decrypt/Send the server's keys
- concert/load the server's keys to...

 

This package includes several simple examples to help developers get start with B4J.

The following examples are included:

• Hello World - One line example that prints Hello World.
• Guess...

 

Starting from B4J v3.50 the IDE includes a visual designer similar to B4A and B4i designer.
The output of the designer is a bjl file. This file can be loaded to other panes or containers with:

...

 

I work on a laptop (14" screen) as my primary screen.
I also have a 21 inch screen as my extended display (used for browser display mostly).

The Feedback example hard-coded the number of...

 

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...