title: Problems with R.layout.main
body: <p>I am having a hard time trying to get my way around this. I just started a new project, and without doing anything the project shows this error at the <code>mainactivity.java</code> src, right at this line...</p>
  
  <pre><code>setContentView(R.layout.activity_main);
  </code></pre>
  
  <p>gives me "R cannot be resolve to a variable", ok, "quick fixes" gives me among others the option to import R, I go ahead and do it, then I got a new error " activity_main cannot be resolved or is not a field" and then quick fixes gives me just one option, "change to activity_list_item", so my question is: why all this is happening?</p>
  
  <p>and then on this method</p>
  
  <pre><code>public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.main, menu);
          return true;
  </code></pre>
  
  <p>I get same error at <code>R.menu.main</code>, but now I do not get any options???</p>
  
  <p>I am having a hard time with this <code>R.java</code>. I tried all possible fixes I found at this forum but none of them work.
  help please. thanks</p>