title: Open source libraries attribution in Android apps
body: <p>Several Android apps (especially the ones by Google) feature a section with a list of open source libraries used in the app and for each of them, a full text of its licence. This usually involves the Apache License, which is used in most of the common Android libraries, such as ActionBarSherlock, ViewPagerIndicator, Guava etc.</p>
  
  <ul>
  <li><p>Is it mandatory to include such attribution in order to comply with the terms of the (Apache) license?</p></li>
  <li><p>How should this section look? If multiple libraries use the same license, is it necessary to duplicate the text of the license for each of them?</p></li>
  <li><p>Is it even necessary to include the whole text of the license, or is the sole copyright notice enough (see the appendix here: <a href="http://www.apache.org/licenses/LICENSE-2.0" rel="noreferrer">http://www.apache.org/licenses/LICENSE-2.0</a>)?</p></li>
  <li><p>Do the official Android developer guidelines feature some information on this topic (I failed to find any)?</p></li>
  </ul>