So, I have this web app to book some reservation, which connect to mysql database using javascript and the UI layout is using html and css 

Is it possible to convert the whole thing into android app, while changing the layout from html to xml like in android studio? I want to change the layout (buttons etc ) and make it editable in android studio 

And if that's not possible and I have to make it from scratch, can I use those javascript to connect to the same db while using android studio, so I only need to create the UI?