There is a android app source code on github which written by kotlin.
so you must know kotlin.
you should debug the app ensure it run well ,then redesign the app ui .
You should follow the document to redesign the ui and implement every function of buttons on new ui,you can copy the code from source to new app.
I will provide help document and correlative API and necessary translation for your work.
the source code web link is [url removed, login to view]
the help document please check attachment.
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