B4J Tutorials

[Server] Screen capture server

• By Erel
• Jan 30, 2014

This is a simple server that takes a screenshot of the current desktop screen and returns the image as the response.

For example if you call it from the device browser:



The handler...

 

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[ABMaterial] One Page, Many Uses

• By Harris
• Dec 31, 2015

This example uses one ABM page to handle all tables listed under "Configure App".
In an effort to reduce code size (and maintenance), number of pages and duplicate methods, I am...

 

Last edited: Dec 31, 2015

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[WebApp] Minimum Spanning Tree

• By Erel
• Mar 20, 2016

I took Ilan's challenge and implemented a minimum spanning tree algorithm.

You can see the solution online: https://b4x.com:51041/mst/index.html

The algorithm used is Prim's...

 

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[IoT] Linux Embedded Boards - Gettings started

• By Erel
• Nov 16, 2015

There are many Linux based, embedded boards available. Most or all of them support Java which means that they also support B4J.

In order to start development we need to install Java JRE 7+ (JDK...

 

Last edited: Nov 22, 2015

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[ABMaterial] New component ABMPDFViewer in 1.08

• By alwaysbusy
• Mar 2, 2016

A new component for ABMaterial in the next version (1.08): ABMPDFViewer. It allows viewing, printing, downloading, localizing, a side view to show pages and more.

Completely materialized...

 

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[ABMaterial] Animating about anything

• By alwaysbusy
• Feb 23, 2016

I'm finalizing version 1.07, and one of the new things you will be able to do is animate ABMContainers (and ergo all its child components. Here is a demo animating a slide in/slide out of a...

 

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[ABMaterial] Using Google Analytics in 1.07

• By alwaysbusy
• Feb 17, 2016

I've put a new tutorial post on my blog on how to use Google Analytics in the upcoming new version of...

 

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Install Bluetooth on Raspberry Pi with Raspbian Jessie

• By Mark Read
• Feb 13, 2016

I have no idea where to post this, so please excuse if this is not the right place.

The installation of a bluetooth dongle on the new Raspbian Jessie is apparently different.

Common to...

 

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[ABMaterial] Infinite scrolling pages with 1.07

• By alwaysbusy
• Feb 8, 2016

A new feature in v1.07 will be Infinite Scrolling Pages (like twitter, facebook, etc). It's going to be super simple to make

Demo video:

The code:...

 

Last edited: Feb 8, 2016

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[Server] Table report with Export feature

• By Erel
• Mar 23, 2014

Online example: http://basic4ppc.com:51042/reports/index.html

In this example we are using a JQuery open...

 

Attachments

• TableExample.zip

  5.7 KB · Views: 1,403

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[RPi] - PiFace Control And Display (CAD)

• By Erel
• Jan 21, 2016

jPi4J library supports the PiFace Digital extension. However it doesn't support the CAD module as the...

 

Attachments

• PiFace_CAD.zip

  1.7 KB · Views: 952

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Basic ListView Scrolling?

• By LWGShane
• Jan 20, 2016

Is there anyway to handle a ListView that has more items than can fit on-screen?

 

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[ABMaterial] One Page - Subs required

• By Harris
• Jan 12, 2016

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...

 

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[ABMaterial] Populate a combo based on another selection

• By Harris
• Jan 2, 2016

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...

 

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Remote control Raspberry Pi with Tablet via Bluetooth.

• By Mark Read
• Jan 5, 2016

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...

 

Attachments

• Windsonic_server.zip

  1.9 KB · Views: 680
• winsonic_client.zip

  86 KB · Views: 716
• windsonic_client.png

  36.3 KB · Views: 808

Last edited: Jan 6, 2016

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[IoT] Raspberry 2 & B4J from the scratch...

• By KMatle
• Oct 28, 2015

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...

 

Last edited: Nov 1, 2015

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B4J: Using RSA with OpenSSL & php

• By KMatle
• Oct 25, 2015

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...

 

Attachments

• RSAExampleB4J.zip

  3.2 KB · Views: 645

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Getting Started Examples

• By Erel
• Aug 23, 2015

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...

 

Last edited: Feb 7, 2017

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Internal Visual Designer

• By Erel
• Jul 28, 2015

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:

B4X:

...

 

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[ABMaterial] Number of Data Grid Rows to Display

• By Harris
• Dec 26, 2015

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...

 

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