How this web site working?

how can you develop this site.and how this site working?

Are you talking about appinventor??
I think you are. And to answer your question is not easy as I am not a pro java developer but I will try

I think you are asking how they developed this so this is very complicated and you need to have much much knowledge about programing appinventor is made of many languages like Java python, JavaScript, jQuery,xml and list go on
And if you are a pro programmer then maybe @ewpatton can explain you better

this might help


Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.