// OVERRIDABLE
  @Override
  protected void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    String name = getIntent().getStringExtra(STRING_EXTRA_NAME);
    String parentFolder = getIntent().getStringExtra(STRING_EXTRA_PARENTFOLDER);

    setContentView(R.layout.activity_fragments_single);

    fragment =
        (ListPicturesForNameBaseFragment) getFragmentManager().findFragmentByTag(FRAGMENT_TAG);

    if (fragment == null) {
      fragment = createFragment();
      fragment.setParameters(parentFolder, name);

      getFragmentManager()
          .beginTransaction()
          .add(R.id.fragment_container, fragment, FRAGMENT_TAG)
          .commit();
      getFragmentManager().executePendingTransactions();
    }
  }
 /**
  * onClick action for Button "additional pictures".
  *
  * @param view The view triggering the onClick action.
  */
 public final void selectDifferentPictureActivity(final View view) {
   ListFoldersForDisplaySecondActivity.startActivity(this, fragment.getParentFolder());
 }