title: Eclipse: "The import java.io cannot be resolved"
body: <p>I have several Android projects in Eclipse, and all is fine, except one (a library) that can not resolve any imports.</p>
  
  <p>The java.io imports do resolve fine in other Android projects in the same workspace, and previously (I haven't used it for over a year) this library worked fine, too. </p>
  
  <p>Any ideas?</p>