title: How do I call findViewWithTag in the OnCreate() method of an activity?
body: <p>I get an error when I call <code>findViewWithTag()</code> in the <code>onCreate()</code>  </p>
  
  <blockquote>
    <p>"The method <code>findViewWithTag(String)</code> is undefined for the type
    MainActivity"</p>
  </blockquote>
  
  <p>Is there any alternative?</p>