title: Not able to get activity_main.xml file
body: <p>I am not able to get the activity_main.xml file in layout. I my code i am not getting </p>
  
  <pre><code>setContentView(R.layout.activity_main.xml);
  </code></pre>
  
  <p>I am getting this error </p>
  
  <pre><code> activity_main cannot be resolved or is not a field. 
  </code></pre>
  
  <p>Please explain me what is need to be done to get access. </p>