How to change the size of menu item icon in NavigationView?

I have the following menu item:

<item
   android:id="@+id/lock"
   android:checkable="true"
   android:title="@string/lock" >
   <menu>
       <item
          android:id="@+id/block_mess"
          android:checked="true"
          android:icon="@drawable/chantinnhan"
          android:title="@string/block_mess_string" />
        <item
            android:id="@+id/block_call"
            android:checked="false"
            android:icon="@drawable/chancuocgoi"
            android:title="@string/block_call_string" />
        <item
            android:id="@+id/lock_app"
            android:checked="false"
            android:icon="@drawable/khoaungdung"
            android:title="@string/lock_app_string" />
   </menu>
</item>

...there's still more but it's really long

but the icon is really small (even it has res 256x256). I'd like to make it bigger! Is this possible?

Here's the screenshot:

EDIT: OK, we both know that Google "lock" the icon size. But I want to know that can I "bypass" that lock and make something... customizable?

You can change the size of navigationView icon by overriding design_navigation_icon_size attribute. You can put it in dimens and because you're overriding a private attribute, you need to include tools:override="true"

<dimen name="design_navigation_icon_size" tools:override="true">40dp</dimen>

Got Solution

Make Below entry in dimens.

<dimen name="design_navigation_icon_size">48dp</dimen>