Other Can I use xamarin libs in b4a ?

You cannot use Xamarin libraries with B4A. It is completely different framework.

any way I can ? I seen that both Xamarin and android studio can use .so file in apk. If yes than I can manage to convert c# and java to VB(so easy).

You can use java libraries with B4A, easily.

You cannot use Xamarin libraries. There is also no reason to use Xamarin libraries as there are better Java libraries.

There is also no reason to use Xamarin libraries

Click to expand...

I 100% agree to you in this regard. Xamarin is simply a shit. It embeds all dlls into apk.
But the problem is that some people have already did projects in xamarin. So I wanted to utilize their efforts and take their fruits of work.
May be b4a supports xxx.so file. Is that so ? Because this file is so important in any apk. Both old and modern use this type of file.



Dynamically Linked "Shared Object" Libraries: (.so)
If you arent familiar with .so file then you can see
what is .so file?
how .so file is compile?

There are many discussions about so files: https://www.b4x.com/android/forum/pages/results/?query=.so

You can wrap or access directly Java code that is based on so files (JNI code).