B4J Tutorials

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: 3,473

Last edited: Aug 10, 2016

Click to expand...

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: 632
• LVSync-2.zip

  3.1 KB · Views: 587

Last edited: Oct 30, 2014

Click to expand...

Customized ListView

• By Erel
• Nov 25, 2013

Use xCustomListView instead.

 

Last edited: Apr 27, 2020

Click to expand...

[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: 1,083

Click to expand...

[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...

 

Click to expand...

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: 1,594

Last edited: May 2, 2015

Click to expand...

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: 561

Click to expand...

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: 593

Click to expand...

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...

 

Click to expand...

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

 

Click to expand...

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: 2,151
• webview2.zip

  2.6 KB · Views: 1,321
• webview3.zip

  3.6 KB · Views: 1,270
• webview4.zip

  3.8 KB · Views: 1,461

Last edited: Jan 16, 2014

Click to expand...

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: 1,729

Last edited: Nov 20, 2013

Click to expand...

[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

Click to expand...

[Server] Guess My Number example

• By Erel
• Feb 4, 2014

The purpose of this example is to demonstrate how you can interact with the server through ajax requests.

The server...

 

Attachments

• ServerGuessMyNumber.zip

  2.4 KB · Views: 860

Click to expand...

Working with files

• By Erel
• Nov 19, 2013

The File methods in B4J are identical to B4A File methods.

Text file methods

File.WriteString - Writes the given text to a new file.
File.ReadString - Reads a file and...

 

Last edited: Dec 10, 2015

Click to expand...

Using Sliders

• By Daestrum
• Nov 28, 2013

This is a simple example that shows :
Using sliders
Re-sizing windows
Changing background colour of a window
Truncating/Expanding text
Moving labels to keep pace with a slider button
Text with...

 

Attachments

• SlidersAndText.zip

  2 KB · Views: 974

Click to expand...

jexcell and other librairies

• By a_carignan
• Jun 24, 2014

How do I install the jexcell bookstore?
In fact I can not find it on the site.

 

Click to expand...

[WebApp] Example Task Manager using WebSockets & SQLite

• By rwblinn
• Apr 13, 2014

This example is a simple Task Manager using HTML to access the server by the Client.
The tasks are stored in a SQLite database, which is managed by the B4J WebServer.
Read...

 

Click to expand...

[WebApp] (mini) Template Engine

• By Erel
• Apr 22, 2014

WebUtils.ReplaceMap together with the CreateMap keyword are useful for building dynamic strings, especially for html output.

For example, in the chat example when a user writes a message we...

 

Click to expand...

[Server] Performance measures

• By Erel
• Feb 5, 2014

B4J server library is based on an open source project named Jetty.
Jetty server performance is excellent which means that B4J server performance is also excellent.

The following numbers are the...

 

Click to expand...