title: What does it mean when a folder/class is highlighted in android studio?
body: <p>I've searched over the Internet but could not find anything.</p>
  
  <p>I don't know what these highlighted files in Android Studio means: </p>
  
  <p><a href="https://i.stack.imgur.com/eNRVl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eNRVl.png" alt="enter image description here"></a></p>