B4J Tutorials

Edit: Most updated instructions are available here: https://www.b4x.com/b4j.html

 

Edit: See this page for more information about B4J: https://www.b4x.com/b4j.html

 

This is an old and irrelevant tutorial.

 

When you create a new UI project, the project starts with a single code module with the following code:

#Region  Project Attributes
   #MainFormWidth: 500
   #MainFormHeight: 500
#End Region...

 

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

 

This example uses a Canvas node together with a Timer to draw a moving smiley.

The Canvas node is a special node the you...

 

Latest version available here: https://www.b4x.com/android/forum/threads/b4x-dbutils-2.81280/

This example demonstrates how DBUtils module can be used in B4J.

DBUtils was modified to...

 

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

AsyncStreamsObject allows you...

 

The computer chooses a number and you need to find the correct number.

Sub Process_Globals
   Private fx As JFX...

 

You can create an RDC client with B4J in the same way as done with B4A: Remote Database Connector - Connect to any remote DB...

 

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 currently supports two types of applications: UI applications (based on JavaFX) and Non-UI applications.

Non-UI applications are standard Java applications. Usually the input to such...

 

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...

 

You can find the documentation page here: http://www.b4x.com/b4j/documentation.html

Note that the documentation is not yet complete.

 

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...

 

This example is similar to the previous example...

 

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

 

To help with my own learning I have played with JavaObject and JavaFX to create linecharts.

Here are the 3 examples I have made I have ported the code directly from the Oracle...

 

A Canvas node is used to magnify a small window under the mouse cursor.

The main code is:

Sub iv_MouseMoved...

 

The JVM (Java Virtual Machine) performance is quite amazing.

This means that we can use B4J to build apps that handle huge files.
I downloaded a 3.7GB log file from this server. Each line...