如何在弹出菜单中设置文本centerHorizontal

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/menu_item"
        android:title="示例菜单项" />
</menu>

// 弹出菜单的触发方法
public void showPopupMenu(View view) {
    PopupMenu popupMenu = new PopupMenu(this, view);
    popupMenu.getMenuInflater().inflate(R.menu.menu_example, popupMenu.getMenu());
    
    // 设置菜单项文本居中
    MenuItem menuItem = popupMenu.getMenu().findItem(R.id.menu_item);
    SpannableString s = new SpannableString(menuItem.getTitle());
    s.setSpan(new AlignmentSpan.Standard(Layout.Alignment.ALIGN_CENTER), 0, s.length(), 0);
    menuItem.setTitle(s);
    
    popupMenu.show();
}