title: Can't change button's background color in XML .Android studio
body: <p><a href="https://i.stack.imgur.com/EGo5f.png" rel="noreferrer"><img src="https://i.stack.imgur.com/EGo5f.png" alt="Android studio screenshot" /></a></p>
  <p>I created <code>TableLayout</code> then buttons. The button's color was automatically set purple. So I can't change them right now.  It's my first time here.</p>