Android Studio changed these files.
Show progress while loading the document.

* DocumentActivity: Add hasUri(). Also call showDocumentTitle()
  when the document has finished loading.
* TableNavActivity: onCreate(): If no URI was provided (to the
  base class) then call TableNavFragment.update() now to show
  an empty list. Otherwise, wait for onDocumentLoadingFinished()
  so we can have the ListView's default behaviour of showing
  a circle progress "bar" until its ListHandler is set.
  Move some code into getTableNavFragment() for sharing.
* TableNavFragment(): onCreate(): Do not call update() here.
  Instead, let TableNavActivity decide when to call it.