title: Should I keep android.support.v4.app.Fragment and its derived classes when building a release version of my app?
body: <p>I read this <a href="https://stackoverflow.com/a/13822079/1065835">answer</a> and undestood why I should keep names of my services, activities, and custom views. But should I keep my classes which derive from android.support.v4.app.Fragment?</p>
  
  <p>I also took a look at the defualt Proguard config file  <code>%SDK_DIR%\sdk\tools\proguard\proguard-android.txt</code>, and there were no rules regarding fragments.</p>