title: Android Studio: Adding a library outside of the project root
body: <p>I have two projects, A and B, and would like to share some code between them via a library project, C.  What is the proper way to do this such that:  </p>
  
  <ol>
  <li>A and B and C are all in separate projects. (Not in the same directory at all)  </li>
  <li>Changes to C are used in A or B automatically without re-importing C. </li>
  </ol>
  
  <p>I'm fairly new to Android Studio and I've been running into all sorts of issues here.  I really just want to use source code that is located outside the project root.  Thanks!</p>