我有一个带有FrameLayout和菜单的ActionBarActivity。当用户单击菜单项时，我用相关的新fragment替换fragment。但是，我看不到删除所选fragment的菜单项的明显方法。publicclassMainActivityextendsActionBarActivity{@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);if(savedInstan