how to add bottom border in relativelayout

Answer 1

I hope I understood what you said.

in the res folder create a new folder (if you don't already have it) named drawable

there create an xml named "borders.xml"

You can further edit it as you like. Then select the layout from the Outline and click Background properties, and select the borders xml that you created.

This will create borders for all 4. Alternatively, you can add a simple

line and add it to the bottom of your layout and change the color/size to your liking.