B4J Question Start of a new project. Questions about B4J

[vecino]

Hey, everybody, I need some advice.

I have been working with B4A since 2012 and I am very happy with the result, and from that date until now the improvements are continuous and the change is spectacular.

Now I have been asked for a new project and I am a little scared, it must work in Android, in gnu/Linux and mainly in Raspbian (the Raspberry system).
I've read that B4J can do it, but I have some doubts:

- Is it really true that B4J creates executables for all those systems?
- Does the same code work on all systems or do you have to compile it for each one?
- Is the source code the same for all or do you have to take into account something to compile for all?
- Is there a tutorial that explains everything you have to take into account to work with B4J to create executables that work in all systems I have indicated?

I don't know if it's possible or if I'm asking for something impossible.
I'm waiting for your advice.
Thank you very much.
Greetings.

 

[sorex]

there's a difference between Android and desktop environments.

a desktop environment (B4J) project should run on windows, ios, linus without much issues I guess. (only did some windows & raspbian coding so far)

with XUI you can create things that will work on both (Android/Windows) but you still need to use B4A & B4J to create the end product.

most code can be shared with classes tho so you don't need to do it multiple times from scratch.

you can add platform specific exeptions via conditional compiling (search for #if)

 

[vecino]

Thank you for your explanation.
So I think I understand that by using "#if" I can compile the same code with B4A and with B4J, is that right?

 

[sorex]

no, it's the opposite.

you tell for which platform that piece of code is.

if you put code in a #if B4J block you will see that it will turn grey when you open the file in B4A/B4i so it's not valid for that platform and it won't be added during compilation.


actually when re-reading your line it's correct if you use #if B4A and B4J but if your focus is both platform it's no use to use it like that.

 

[vecino]

Ummm... I'm not sure I understood, in short, what I understood I was supposed to do:

Can I write a single code that can be compiled with B4A and B4J, indistinctly?
Do I have to write "repeated/adapted" code, for B4A and code for B4J?

What I need is to make a project that works in Gnu/Linux, Raspbian and Android, what do you advise me?
Greetings.

 

[josejad]

¡Hola vecino!

Check these tutorials from the great @Peter Simpson if you haven't done yet.

💡 A simple XUI app transfer from B4A to B4J in under 11 minutes

Hello all, Here is a quick video to show how simple it can be to transfer your B4A projects to B4J when using XUI. It's been on my mind all days now, so I thought I would give it a go and also record my efforts. This is my first ever attempt at doing anything cross platform like this with XUI...

www.b4x.com

💡 Part 1 Basics - Creating long lists using xCustomListView with Lazy Loading - Newer developers

Hello All After thinking about it yesterday and having a quick chat with Erel, I decided that my previous long list examples were not basic enough for newer B4X developers, so I put together a minimal xCLV with LL code example together with comments in the code module. There are no themes...

www.b4x.com

And this one from Erel (great too... of course) :-D

[B4X] Cross platform Editable B4XTable + Form Example

This example demonstrates several things: Cross platform code and files, similar to the way XUI2D games are organized: All the logic is implemented in a class named EditableTable. The module is located in the projects parent folder. The two asset files (list of animals - source; and the...

www.b4x.com

 

[josejad]

Probably these links will be usefull too:

B4JPackager11 - the simplest way to distribute UI apps

Better to start with the integrated packager: https://www.b4x.com/android/forum/threads/integrated-b4jpackager11-the-simple-way-to-distribute-standalone-ui-apps.117880/ B4JPackager11 is a B4J non-ui program that builds a package with your app jar and an embedded modularized Java runtime. It...

www.b4x.com

[Tool] MacStorePackager - publish your App to the Mac AppStore

In this tutorial, I want to show you, how you can upload your Java Application to the Mac AppStore. Here you can find a test Application in the Store. Requirements: MacOS (tested with version 10.13.3) Apple Developer Account Java JDK (recommended: JDK 9) Xcode + Developer Tools Video...

www.b4x.com

The easy way to install your B4J application on Linux

This is meant to be a tutorial for you to easily distribute your applications developed in linux. Through B4JPackager11 and B4JPackager v1.50 the excellent tool developed by Erel gives us the possibility of obtaining a convenient installation file using install Inno Setup. This is for the...

www.b4x.com

 

[Jorge M A]

Bal2Bjl - Deprecated - see post #1

Following on from Erel and @Filippo 's work, I have spent a little time and added some functionality to the code. I have tried it with some very old and complex B4a layouts and it seems to work, but I'm sure there will be some issues along the way. If it doesn't work first time, try saving the...

www.b4x.com

 

[vecino]

Friends, thank you very much.
With all those links, I already have reading for the weekend
I hope to get something out of all that information.

 

[Erel]

Don't use Bal2Bil or Bal2Bjl. They are no longer needed.
You can copy views from one IDE and paste it in the other IDE.

Another important cross platform example: [B4X] Cross platform example

 

[vecino]

Great, that's one less thing to worry about.
Thank you.

 

[lucas555]

If you want to see B4J in real time , log on to pos3.ddns.net:9090 and see the real B4J miracle, just select your language and click on the OK button
this is a full apps created in B4J it is already install on 150 establishment and 750 Android cash register in CANADA and USA
It is a full back office for Store management it communicate with the android pos station and the signage raspberry application (again done in B4J) thru remote connector from Erel

 

[vecino]

Wow, that's what I need, can you tell me something about the project? How is it done? What has been used in each system? Which remote connector do you mean?
Thank you.

 

[Erel]

Which remote connector do you mean?

[B4X] jRDC2 - B4J implementation of RDC (Remote Database Connector)

 

[vecino]

So many things to discover
Thank you.