I worked with Android Studio before. I don't clearly understand your question, but UI design for Android mostly in the (res -> layout) folder, whenever you create a new activity it will be a file there for you to work with. About layout choose Relative layout or Constraint layout will be easiest for you to work with. In Relative layout, items related to other items, and with a parent. Constraint layout relates to the border of items, and the border of the parent items. If that did not answer your question, upload the image here and I am happy to help.