ut file:</p>

   
  <ul>
    <li>
      All Android layout files must start with the XML header line:
      <code>&lt;?xml version="1.0" encoding="utf-8"?&gt;</code>.    </li>
    <li>
      The next definition will often (but not always) be a layout
      definition of some kind, in this case a <code>LinearLayout</code>.    </li>
    <li>
      The XML namespace of Android should always be defined in
      the top level component or layout in the XML so that <code>android:</code> tags can
      be used thr