title: R.java won't generate, and there are no errors in resource files
body: <p>After cleaning my project, my R.java file hasn't generated.</p>
  
  <p>I've tried the following:</p>
  
  <ol>
  <li>Update eclipse. But my version is already up to date.</li>
  <li>Try cleaning the project again.</li>
  <li>Look for errors in my drawable XML files and layout files. I found none.</li>
  <li>Look through my Activity classes for errors; there were none except for the <code>R.java</code> references.</li>
  </ol>
  
  <p>What else can I try?</p>
  
  <p>I'm considering copy-pasting all of my classes, resources and manifest into a new project, but I'm wondering if there's anything else I can do.</p>