Question

我有这个XML。

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <group android:checkableBehavior="single">
        <item
            android:id="@+id/nav_home"
            android:checked="true"
            android:icon="@drawable/ic_home_black_24dp"
            android:title="Home" />
        <item
            android:id="@+id/nav_search"
            android:icon="@drawable/ic_search_black"
            android:title="Search Location" />
        <item
            android:id="@+id/nav_fav"
            android:icon="@drawable/ic_favorite"
            android:title="Favorites" />
        <item
            android:id="@+id/nav_recent"
            android:icon="@drawable/ic_nav_route"
            android:title="Recent Location" />
        <item
            android:id="@+id/nav_route"
            android:icon="@drawable/ic_place"
            android:title="Route" />
    </group>

    <item android:title="Others">
        <menu>
            <item
                android:id="@+id/nav_settings"
                android:icon="@drawable/ic_settings"
                android:title="Settings" />
            <item
                android:id="@+id/nav_about"
                android:icon="@android:drawable/ic_menu_send"
                android:title="About" />
        </menu>
    </item>

</menu>

但是当选择nav_settings时，
该项目未检查。
该项目应该像上面的其他项目一样进行检查这是我设置项目检查的代码片段将正常工作。
但是nav_settings上的选择器没有工作..

 public void selectDrawerItem(MenuItem menuItem) {
            DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
            drawer.closeDrawer(GravityCompat.START);
            Fragment fragment = null;

            Class fragmentClass;
            switch(menuItem.getItemId()) {
                case R.id.nav_home:
                    fragmentClass = FragmentMap.class;
                    setTitle("Map");
                    break;

                case R.id.nav_search:
                    fragmentClass = FragmentSearchLoc.class;
                    Global.setCurrentItem =2;
                    break;
                case R.id.nav_recent:
                    fragmentClass = FragmentSearchLoc.class;
                    Global.setCurrentItem =0;
                    break;
                case R.id.nav_fav:
                    fragmentClass = FragmentSearchLoc.class;
                    Global.setCurrentItem =1;
                    break;
                case R.id.nav_route:
                    fragmentClass = FragmentRoute.class;
                    setTitle("Routing");
                    break;
                case R.id.nav_settings:
                    fragmentClass = FragmentSettings.class;
                    setTitle("Settings");
                    break;
                default:
                    fragmentClass = FragmentMap.class;
            }

            try {
                fragment = (Fragment) fragmentClass.newInstance();
            } catch (Exception e) {
                e.printStackTrace();
            }


            FragmentManager fragmentManager = getSupportFragmentManager();
            fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();

            drawer
            menuItem.setChecked(true);
            drawer.closeDrawers();
        }

Answer 1

我认为不允许像代码那样嵌套项目。

如果您喜欢以下内容，可能会有效：

<group android:checkableBehavior="single">
     <item
         android:id="@+id/nav_settings"
         android:icon="@drawable/ic_settings"
         android:title="Settings" />
     <item
         android:id="@+id/nav_about"
         android:icon="@android:drawable/ic_menu_send"
         android:title="About" />
</group>

NavigationView所选项目

1 个答案: