android - 动态添加组中的菜单项android导航菜单

Question

我有一个导航菜单，看起来像这样 -

<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
    android:id="@+id/nav_home"
    android:icon="@drawable/ic_home"
    android:title="Home" />
<item
    android:id="@+id/nav_logout"
    android:icon="@drawable/ic_logout"
    android:title="Logout" />

<item
    android:id="@+id/choose_bus"
    android:title="Choose a bus">
    <menu>
        <group
            android:id="@+id/group_select_bus"
            android:checkableBehavior="single">
            <!--<item-->
                <!--android:id="@+id/menu_option1"-->
                <!--android:title="Bus 1" />-->
            <!--<item-->
                <!--android:id="@+id/menu_option2"-->
                <!--android:title="Bus 2" />-->
        </group>
    </menu>
</item>

我想从 Activity 中动态添加menu_option1 和menu_option2。我试过了，但没有添加 -

@Override
public boolean onNavigationItemSelected(MenuItem item) {
    NavigationView navView = (NavigationView) findViewById(R.id.nav_view);
    Menu menu = navView.getMenu();
    MenuItem item1 = menu.getItem(2);
    SubMenu subMenu = item1.getSubMenu();
    subMenu.add("Bus 1");
    subMenu.add("Bus 2");

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
  }

Answer 1

尝试这样的事情

Menu menu = navView.getMenu();
menu.add(R.id.group_select_bus,Menu.NONE,Menu.NONE,Youritem);