相关疑难解决方法(0)

我正在尝试使用NavigationView来实现NavigationDrawer.我通过在菜单中设置组ID添加了分隔符.但是我看不到分隔符.我想这是因为分隔符颜色与背景相同.所以我想改变分隔符颜色.但我发现无法改变它.谁能帮我？

在屏幕截图中,似乎有一个空间用于History和之间的分隔符Settings,但你看不到它.

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:fitsSystemWindows="true"
    tools:context=".ui.MapActivity">

    <LinearLayout
        android:id="@+id/main_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <include layout="@layout/toolbar_actionbar" />

        <!--main content-->
    </LinearLayout>

    <android.support.design.widget.NavigationView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@color/navdrawer_background"
        app:insetForeground="#4000"
        app:itemTextColor="@color/navdrawer_item_text_color"
        app:itemIconTint="@color/navdrawer_item_icon_tint"
        app:headerLayout="@layout/drawer_header"
        app:menu="@menu/drawer"/>
</android.support.v4.widget.DrawerLayout>

drawer.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <group android:id="@+id/group_feature"
        android:checkableBehavior="single">
        <item android:id="@+id/navdrawer_item_map"
            android:checked="true"
            android:icon="@drawable/ic_drawer_map"
            android:title="@string/navdrawer_item_map"/>
        <item android:id="@+id/navdrawer_item_favourite"
            android:icon="@drawable/ic_drawer_fav"
            android:title="@string/navdrawer_item_fav"/>
        <item android:id="@+id/navdrawer_item_history"
            android:icon="@drawable/ic_drawer_history"
            android:title="@string/navdrawer_item_history"/>
    </group>
    <group android:id="@+id/group_settings"
        android:checkableBehavior="single">
        <item android:id="@+id/navdrawer_item_settings"
            android:icon="@drawable/ic_drawer_settings"
            android:title="@string/navdrawer_item_settings"/>
        <item android:id="@+id/navdrawer_item_help"
            android:icon="@drawable/ic_drawer_help"
            android:title="@string/navdrawer_item_help"/>
        <item android:id="@+id/navdrawer_item_about"
            android:icon="@drawable/ic_drawer_about"
            android:title="@string/navdrawer_item_about"/> …