B4J Tutorials

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...

 

Use xCustomListView instead.

 

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

This tool allows you to test regular expressions...

 

Online link: http://basic4ppc.com:51042/quiz/index.html

This is an example of an online quiz. When the...

 

As a helper to get started with B4J, some classical HelloWorld type of apps.
B4J offers many solutions in the way an app(lication) can be developed.

Status: 20150502

Below examples...

 

I have been using the in-line java for ages and only just discovered that you do not have to put all the code in one module, as I was previously doing.
It can be placed in the module to which it...

 

Using timelines, it's possible for two (or more if you change code) listviews to occupy the same space on a form.
This demo will slide one listview, revealing the hidden listview. (A bit like...

 

I'll try to collect tips related to the UI elements in this thread.

In B4J (and JavaFX) the main UI element is named Node. It is similar to Basic4android View or Basic4ppc (.Net) Control.

B4J...

 

Not a tutorial. But a feature of SQLite that allot of people do not know about. In memory databases. Can you say fast?

https://www.sqlite.org/inmemorydb.html

 

Been trying WebView and WebEngine.

Here's a little example of using both. (requires additional library to run)

Shows how to retrieve the hyperlinks in a page and put them in a comboBox, also...

 

The attached project is a port of Basic4android charts framework: http://www.b4x.com/android/forum/threads/android-charts-framework.8260/#content...