title: R class is missing from my android project
body: <p>I have a problem with R class from my android app. This class is missing from my project. So far I have done:
   Project -> Clean
   Right click on my project -> Android tools - > fix project properties
   I restart my IDE and did again the same things but the R class it still missing.</p>
  
  <p>What can I do in this situation?</p>