Android Tutorial => Add underline in menu elements

Example

Each group ends with a line separator. If each item in your menu has its own group you will achieve the desired graphical output. It will work only if your different groups have different android:id. Also, in menu.xml remember to mention android:checkable="true" for single item and android:checkableBehavior="single" for a group of items.

<?xml version="1.0" encoding="utf-8"?>
    <menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
          android:id="@+id/pos_item_help"
          android:checkable="true"
          android:title="Help" />
     <item
        android:id="@+id/pos_item_pos"
        android:checkable="true"
        android:title="POS" />

    <item
        android:id="@+id/pos_item_orders"
        android:checkable="true"
        android:title="Orders" />

       <group
            android:id="@+id/group"
            android:checkableBehavior="single">
            
                <item
                android:id="@+id/menu_nav_home"
                android:icon="@drawable/ic_home_black_24dp"
                android:title="@string/menu_nav_home" />
        </group>
    
    ......
    </menu>

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Android

Android NavigationView Add underline in menu elements

Fastest Entity Framework Extensions

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