Change Icon size of Default Navigation Drawer

Question

Trying to change the icon size of the default navigation drawer and also to add a divider after each item but I don't understand how to do this? This is the menu drawer view:

<group android:checkableBehavior="single">
    <item
        android:id="@+id/agenda"
        android:icon="@drawable/agenda"
        android:title="AGENDA"
        />
    <item
        android:id="@+id/speakers"
        android:icon="@drawable/speakers"
        android:title="SPEAKERS" />
    <item
        android:id="@+id/schedule"
        android:icon="@drawable/schedule"
        android:title="SCHEDULE" />
    <item
        android:id="@+id/organiser"
        android:icon="@drawable/organiser"
        android:title="ORGANISER" />
    <item
        android:id="@+id/partners"
        android:icon="@drawable/partner"
        android:title="PARTNERS" />
    <item
        android:id="@+id/event_info"
        android:icon="@drawable/eventinfo"
        android:title="EVENT-INFO" />
</group>

this is dimens.xml

<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="nav_header_vertical_spacing">16dp</dimen>
    <dimen name="nav_header_height">160dp</dimen>
</resources>

Answer 1

Setting design_navigation_icon_size and design_navigation_icon_padding in dimens.xml worked for me.

/values/dimens.xml

<dimen name="design_navigation_icon_size" tools:override="true">10dp</dimen>
<dimen name="design_navigation_icon_padding" tools:override="true">10dp</dimen>