code: private void showTitle(@Nullable final CharSequence title) {
          ActionBar actionBar = getSupportActionBar();
  
          if (actionBar != null) {
              if (isSplitScreen()) {
                  if (toolbarLarge != null) {
                      toolbarLarge.setTitle(title);
                  }
  
                  actionBar.setTitle(null);
              } else {
                  actionBar.setTitle(title);
              }
          }
      }
docs: Shows a specific title.
  
  @param title
  The title, which should be shown, as an instance of the type {@link CharSequence} or
  null, if no title should be shown