相关疑难解决方法(0)

我有一个在xml中定义的菜单:

<group android:checkableBehavior="single" android:id="@+id/group">
    <item
        android:id="@+id/grades"
        android:icon="@drawable/ic_font_download_black_48dp"
        android:checked="false"
        android:title="Grades" >
        <menu>
            <item
                android:id="@+id/mp1"
                android:icon="@drawable/ic_looks_one_black_24dp"
                android:checked="false"
                android:title="MP1" />
            <item
                android:id="@+id/mp2"
                android:icon="@drawable/ic_looks_two_black_24dp"
                android:checked="false"
                android:title="MP2" />
            <item
                android:id="@+id/mp3"
                android:icon="@drawable/ic_font_download_black_48dp"
                android:checked="false"
                android:title="MP3" />
            <item
                android:id="@+id/mp4"
                android:icon="@drawable/ic_font_download_black_48dp"
                android:checked="false"
                android:title="MP4" />
        </menu>
    </item>
    <item
        android:id="@+id/schedule"
        android:icon="@drawable/ic_event_black_48dp"
        android:checked="false"
        android:title="Schedule" />
    <item
        android:id="@+id/attendance"
        android:icon="@drawable/ic_assignment_ind_black_48dp"
        android:checked="false"
        android:title="Attendance" />
    <item
        android:id="@+id/assignments"
        android:icon="@drawable/ic_assignment_black_48dp"
        android:checked="false"
        android:title="Assignments" />
    <item
        android:id="@+id/studentInfo"
        android:icon="@drawable/ic_account_circle_black_48dp"
        android:checked="false"
        android:title="Student Details" />
</group>
<group android:id="@+id/group2" android:checkableBehavior="single">
    <item
        android:id="@+id/placeholder"
        android:icon="@drawable/ic_android_black_48dp"
        android:checked="false"
        android:title="Placeholder" />
    <item
        android:id="@+id/placeholder2"
        android:icon="@drawable/ic_android_black_48dp"
        android:checked="false"
        android:title="Placeholder" />
</group>

这会添加一个如下所示的子菜单: …

在我的应用程序中,我想添加N级可扩展Menu,NavigationView如Paytm app截图如下.我试图添加ExpandableListView但不明白如何在NavigationView使用中添加N级可扩展菜单ExpandableListView

如果有人知道如何做到这一点,请帮助我.

我尝试从这个参考链接但不能做/sf/answers/2218998281/