B4J Question Recent UI differences

You have to redesign the Layout file. B4J uses its designer

and the earlier events were javafx based.

Click to expand...

In my experience, very "old" code sometimes contains one or more functions of old legacy code. You will get an error message with which you can find the solution with a search in the forum. In addition, you can replace javafx components with the new XUI version so that your B4J code can also work in B4A. With the option generate members in the designer you can add the necessary code to your old project.

If you are creating B4XPages, by default JFX is not added on top.
You can manually add it if you are going to need it.

Thanks mcqueccu/MicroDrie/aeric,


"you can replace javafx components with the new XUI version so that your B4J code"



Ok, I'm not familiar with XUI, except that I can see it's automatically part of a new UI project now. Is there a thread that talks about the differences, and a general approach to moving a legacy B4J project over?

It sounds like I should just start from scratch, learn about XUI, and gradually move all the functionality over to the new GUI.


"You have to redesign the Layout file. B4J uses its designer"

I was using the B4J Designer, in the legacy project. Although I have some variables defined as a JFX type, they are only used to access the clipboard.

I guess I'm asking for a shortcut, some kind of "Import older designer into the new XUI style", but there's no such animal.


Ok, thanks everyone. I'll start from scratch.

Are you referring to legacy XML layout? The menu to open the legacy designer has been removed since many version updates. Using the new designer to create bjl layout is more simpler now.

JFX is not deprecated and still being use in B4J for many reasons. You can mix JFX and XUI. Both are optional and can work together in the same project.

Using XUI library enables you to develop cross platform apps in B4X-styled, i.e the same code and views are shared and work the same across B4A, B4i and B4J.
Together with another library, XUI Views, you can use views that common between these platforms. Back to the old days, views from these platforms were having different properties and behavior.

For example:
But this is still working:

Check: https://www.b4x.com/android/forum/threads/b4x-xui-cross-platform-native-ui-library.84359/

No, not that far back. The extension of the files produced by the designer, was .bjl.

So the main advantage of XUI, is cross-platform? Ok, I don't need it ; this project is intended strictly for Windows.

B4JExplorer said:

No, not that far back. The extension of the files produced by the designer, was .bjl.

So the main advantage of XUI, is cross-platform? Ok, I don't need it ; this project is intended strictly for Windows.

Click to expand...

My understanding is XUI is not only for cross platform, it is UI for B4X.
There are many powerful views created based on this library. Most examples in this forum is cross platform.

Ok, thanks aeric.