Android Question UI/UX, GUI design, Eye Candy and XML layouts


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Longtime User
Hi Guys, I've given this thread a name that is as mixed up as I currently feel about the topic. As a programmer it is easy to write code, but damn difficult to make it look nice and give the user a pleasing experience. Therefore this post.
There are numerous freelancers available that will do UI/UX design. Some of them will even provide Android studio XML from images. My question is how can one utilise the services from these freelancers and actually implement it? Will they design stuff that is impossible to implement? Will B4A libraries be available?
Can an Android Studio XML file be used in B4A?
What is the best way to move forward on this topic?
Any input will be appreciated.