title: How to add source of 'Android Private Libraries' to ADT eclipse?
body: <p>I try to see source of source android-support-v4.jar and get:
  "The jar of this class file belongs to container and 'Android Private Libraries' "
  <img src="https://i.stack.imgur.com/8cHX4.png" alt="Android Private Libraries"></p>
  
  <p>Where to obtain and attach 'Android Private Libraries' source?</p>