title: raw folder cannot be resolved - android
body: <p>I am using AndroidStudio, which is based on intelliJ Idea. I know that this issue was often presented here, but I created inside <code>res</code> folder some <code>raw</code> folder and copy-pasted some mp3 file <code>jam.mp3</code>. But I can't make my raw folder (inside my res one) resolved by my IDE and I tried numbers of tricks suggested in SO. </p>
  
  <p>I have this line of code</p>
  
  <pre><code>MediaPlayer mp = MediaPlayer.create(this, R.raw.jam);
  </code></pre>
  
  <p>and <code>raw</code> cannot be resolved, how can I fix it ? (Btw, I can't find in my IDE an equivalent of the <code>eclipse</code>'s <code>clean</code>)</p>