Android Question How to translate an app from android studio to b4a


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hello evryone,
i' d like create an app developed with android studio with b4a.
I have thake a look to the code and try to translate it to b4a, but i don't know android dev as well.
(This app use local sqlite db, json for comunicate with backend with api.php page...; it use class& array)

But i don' t understand the global logical of this app.
i have buy "amir" fragment lib, and all recycleview lib
i Attach what i have do and the android studio project.

I think that for all who dev in android studio too it is easy to understand and tell me how and what can i do.

Android studio project:

What i can do: