In xml and java for Android studio in it button are Different ? What is Difference Between java and xml button

Question

if it have Difference I want to create a Button Which can make a call directly

Answer 1

If I get your question correctly you want to know what java and xml are used for in Android development. It shares the same principle with web development. HTML is used for front end development while Javascript and other languages are used for back end development. In Android XML is used for front while Java for back end.

Answer 2

will I need both argument for call a button or create button in my app need both?!