title: How to group elements in xml layout for align in Android
body: <p>I have <code>TextView</code> and <code>ImageButton</code> in <code>xml</code> layout. And <code>ImageButton</code> is positioned right of <code>TextView</code> and I want group both to center them horizontally at screen. I use <code>RelativeLayout</code>.</p>
  
  <p>What should I do? </p>