B4J Tutorials

where to code put code when using multiple forms

• By raphipps2002
• Nov 2, 2015

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...

 

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[IoT] Headless Raspberry Pi

• By Mark Turney
• Oct 31, 2015

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...

 

Last edited: Oct 31, 2015

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TreeView Tutorial

• By Erel
• Dec 11, 2013

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...

 

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GameView - Simple Sprites Engine

• By Erel
• Sep 3, 2015

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...

 

Attachments

• jGameViewHelper.zip

  5.6 KB · Views: 1,760
• Asteroids.zip

  244.3 KB · Views: 1,767

Last edited: Sep 3, 2015

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Modal dialogs

• By Erel
• Nov 19, 2013

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...

 

Attachments

• ModalExample.zip

  2 KB · Views: 2,541

Last edited: Dec 3, 2013

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B4J tutorial for Basic4android developers

• By Erel
• Nov 19, 2013

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...

 

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FlickrViewer

• By Erel
• Nov 18, 2013

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

 

Attachments

• FlickrViewer.zip

  3.2 KB · Views: 1,469

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AsyncStreamsObject - Send and receive objects over the network

• By Erel
• Nov 18, 2013

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

AsyncStreamsObject allows you...

 

Attachments

• AsyncStreamsObject.zip

  4.1 KB · Views: 3,997

Last edited: Aug 10, 2016

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Synchronize ListView Scrolling

• By stevel05
• Oct 29, 2014

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...

 

Attachments

• LVSyncClass.zip

  2.8 KB · Views: 888
• LVSync-2.zip

  3.1 KB · Views: 829

Last edited: Oct 30, 2014

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Customized ListView

• By Erel
• Nov 25, 2013

Use xCustomListView instead.

 

Last edited: Apr 27, 2020

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[Server] Regex Tool

• By Erel
• Mar 24, 2014

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

This tool allows you to test regular expressions...

 

Attachments

• regex.zip

  2.4 KB · Views: 1,486

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[WebApp] Quiz Example

• By Erel
• Apr 22, 2014

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

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

 

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B4J HelloWorld(s) Examples

• By rwblinn
• May 1, 2015

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...

 

Attachments

• B4JHowToHelloWorlds.zip

  23.4 KB · Views: 1,965

Last edited: May 2, 2015

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In-line Java in multiple modules

• By Daestrum
• May 1, 2015

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...

 

Attachments

• java code modules test.zip

  1.6 KB · Views: 816

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Use Timelines to 'slide' listviews

• By Daestrum
• Apr 30, 2015

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...

 

Attachments

• sliding listviews.zip

  1.9 KB · Views: 840

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Nodes / Views / Controls - Tips

• By Erel
• Nov 27, 2013

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...

 

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The FASTEST SQLite tables

• By JakeBullet70
• Mar 11, 2015

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

 

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WebView

• By Daestrum
• Jan 10, 2014

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...

 

Attachments

• webview.zip

  1.9 KB · Views: 2,511
• webview2.zip

  2.6 KB · Views: 1,645
• webview3.zip

  3.6 KB · Views: 1,585
• webview4.zip

  3.8 KB · Views: 1,814

Last edited: Jan 16, 2014

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Charts Framework

• By Erel
• Nov 20, 2013

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

 

Attachments

• Charts.zip

  5.1 KB · Views: 2,118

Last edited: Nov 20, 2013

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[WebApp] Concurrent access to SQLite databases

• By Erel
• Apr 14, 2014

SQLite databases are very easy to use as they don't require any additional software or configuration.

SQLite support for concurrent access is not comparable to server based databases such as...

 

Last edited: Nov 21, 2021

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