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我目前在操作栏中使用列表菜单，代码如下：

Context context = getSupportActionBar().getThemedContext();
        ArrayAdapter<CharSequence> list = ArrayAdapter.createFromResource(context, R.array.locations, R.layout.sherlock_spinner_item);
        list.setDropDownViewResource(R.layout.sherlock_spinner_dropdown_item);

    getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
    getSupportActionBar().setListNavigationCallbacks(list, this);
}

@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
 // When menu item is selected and is different from currently selected menu item
}

Right now the callback is only fired if the menu item selected is different from the currently selected item. 即使新选择的菜单项相同，如何使其触发？

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