code: public DbxDelta<DbxEntry> getDelta(/*@Nullable*/String cursor, boolean includeMediaInfo)
          throws DbxException
      {
          return _getDelta(cursor, null, includeMediaInfo);
      }
docs: Return "delta" entries for the contents of a user's Dropbox.  This lets you
  efficiently keep up with the latest state of the files and folders.  See
  {@link DbxDelta} for more documentation on what each entry means.
  
  <p>
  To start, pass in {@code null} for {@code cursor}.  For subsequent calls
  To get the next set of delta entries, pass in the {@link DbxDelta#cursor cursor} returned
  by the previous call.
  </p>
  
  <p>
  To catch up to the current state, keep calling this method until the returned
  object's {@link DbxDelta#hasMore hasMore} field is {@code false}.
  </p>
  
  <p>
  If your app is a "Full Dropbox" app, this will return all entries for the user's entire
  Dropbox folder.  If your app is an "App Folder" app, this will only return entries
  for the App Folder's contents.
  </p>