title: Android: cannot find symbol for my own imported class
body: <p>Okay, this is driving me absolutely nuts. Relevant info:</p>
  
  <p>I'm using Android Studio</p>
  
  <p>I'm trying to set up a gaussian blur from here: <a href="https://stackoverflow.com/a/14556162/2170400">https://stackoverflow.com/a/14556162/2170400</a></p>
  
  <p>In my src/com/myprojectname folder I have, among others, the following files: AndroidImage.java, IAndroidFilter.java, ConvolutionMatrix.java and GaussianBlur.java. In IAndroidFilter.java I need to</p>
  
  <pre><code>import com.myprojectname.AndroidImage;
  </code></pre>
  
  <p>However I get a message saying "Cannot resolve symbol 'AndroidImage'". In the auto-complete menu that pops up while I'm typing the import statement I can see EVERY SINGLE CLASS in my src/com/myprojectname folder EXCEPT AndroidImage, which I can clearly see in the explorer.</p>
  
  <p>I've quit and re-opened Android Studio several times, I've re-synced everything, I've deleted then re-created the AndroidImage class, I've tried to import AndroidImage in other classes with the same failed result as in the IAndroidFilter class...</p>
  
  <p>Why is it that I can't import this class? Seriously, why? I'm at a total loss for further fixes to try.</p>