导航抽屉：如何突出显示选定项目

Question

我在我的应用程序中使用了可以在android工作室添加的抽屉菜单，我在导航抽屉中添加了一些菜单条目（参见代码块）。如果我按下第一个项目（nav_home）或第二个，导航抽屉会突出显示当前按下的项目。

如果我按下项目“nav_information”按钮或其他项目，则会打开新的（单击的）片段，并且看不到突出显示（主页或第二个项目仍突出显示）

很快，只有第一个项目在选定的项目上显示突出显示。

 <?xml version="1.0" encoding="utf-8"?>
<group android:checkableBehavior="single">
    <item
        android:id="@+id/nav_home"
        android:icon="@drawable/ic_home_black"
        android:title="Startseite" />

    <item android:id="@+id/nav_greetings"
        android:title="Grußwort"/>
    </group>

<group android:checkableBehavior="single">
    <item android:title="Neuigkeiten">
    <menu >

        <item
            android:id="@+id/nav_information"
            android:icon="@drawable/ic_info_black"
            android:title="@string/title_activity_aktuelles" />

    </menu>
    </item>
</group>
 ....

这是我处理片段打开的方式。

  @SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    Fragment myFragment = null;

    if (id == R.id.nav_home) {
            drawer.setSelected(true);
        myFragment = new MainScreen();
    }else if (id == R.id.nav_greetings){
        myFragment = new Greetings();
    } else if (id == R.id.nav_information) {
        myFragment = new Aktuelles();
    } else if (id == R.id.nav_directions) {
        myFragment = new Anfahrt();
    } else if (id == R.id.nav_basilika) {
        myFragment = new Rundabout();
    } else if (id == R.id.nav_download) {
        myFragment = new Downloads();
    } else if (id == R.id.nav_history) {
        myFragment = new History();
    }else if(id == R.id.nav_hauptwallfahrt){
        myFragment = new Hauptwallfahrt();
    }else if (id == R.id.nav_themenwallfahrt){
        myFragment = new Themenwallfahrt();
    }else if (id == R.id.nav_pilgergruppen){
        myFragment = new Pilgergruppen();
    }else if (id ==R.id.nav_wallfahrtgodi){
        myFragment = new Wallfahrtsgottesdienste();
    }


    FragmentManager fragmentManager = getSupportFragmentManager();

    FragmentTransaction ft = fragmentManager.beginTransaction();

    // Replace the requestet Fragment
    ft.replace(R.id.container, myFragment) ;
    ft.commit();

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

有没有办法“启用”高亮显示？

提前致谢！

Answer 1

它是这样做的：

<?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:icon="@drawable/home_blue"
            android:title="@string/home" />
        <item
            android:id="@+id/nav_search"
            android:icon="@drawable/search_icon"
            android:title="@string/search" />

    </group>
    <item android:title="Neuigkeiten">
        <menu>
            <group android:checkableBehavior="single">
                <item
                    android:id="@+id/nav_lang"
                    android:icon="@drawable/lang_blue"
                    android:title="@string/language" />
                <item
                    android:id="@+id/nav_invite"
                    android:icon="@drawable/call_friend_blue"
                    android:title="@string/invite_friend" />
                <item
                    android:id="@+id/nav_about"
                    android:icon="@drawable/about_us_blue"
                    android:title="@string/about_health_in_touch" />
            </group>
        </menu>
    </item>
</menu>

Answer 2

</group>
<item android:title="Neuigkeiten">
    <menu>
        <group android:checkableBehavior="single">
            <item
                android:id="@+id/nav_lang"
                android:icon="@drawable/lang_blue"
                android:title="@string/language" />
            <item
                android:id="@+id/nav_invite"
                android:icon="@drawable/call_friend_blue"
                android:title="@string/invite_friend" />
            <item
                android:id="@+id/nav_about"
                android:icon="@drawable/about_us_blue"
                android:title="@string/about_health_in_touch" />
        </group>
    </menu>
</item>

Answer 3

你只需要改变标签的顺序

我尝试了最后一组，但效果不错，请检查

<item android:title="Neuigkeiten">
  <menu >
      <group android:checkableBehavior="single">
          <item
            android:id="@+id/nav_information"
            android:icon="@drawable/ic_info_black"
            android:title="@string/title_activity_aktuelles" />

     </group>
 </menu>