ydcool

    /**
     * solve overflow menu icon not showing bug on {@link android.support.v7.widget.Toolbar}
     *
     * @see <a href="http://stackoverflow.com/questions/30076392/how-does-this-strange-condition
     * -happens-when-show-menu-item-icon-in-toolbar-over">StackOverflow question<a/>
     */
     @Override
    protected boolean onPrepareOptionsPanel(View view, Menu menu) {
        if (menu != null) {
            if (menu.getClass().getSimpleName().equals("MenuBuilder")) {