title: font size of items inside navigation drawer not changing
body: <p>I want to increase the font size of items inside activity_main_drawer.xml which is the items showing in menu of navigation drawer. I've tried changing inside  tag by adding
  android:textSize="22dp"
  I've also created "style" inside style.xml file</p>
  
  <pre><code>&lt;style name="DrawerTextStyle" &gt;
       &lt;item name="android:textColor"&gt;@color/colorPrimaryDark&lt;/item&gt;
       &lt;item name="android:textSize"&gt;40dp&lt;/item&gt;
       &lt;item name="android:textStyle"&gt;bold&lt;/item&gt;
   &lt;/style&gt;
  </code></pre>
  
  <p>then I apply to the activity_main_drawer.xml. but it doesn't take effect. </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      tools:showIn="navigation_view"
      android:theme="@style/DrawerTextStyle"&gt;
  
      &lt;group android:checkableBehavior="single"&gt;
          &lt;item
              android:id="@+id/author_nietzsche"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Friedrich Nietzsche" /&gt;
          &lt;item
              android:id="@+id/author_rand"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Ayn Rand" /&gt;
          &lt;item
              android:id="@+id/author_kant"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Immanuel Kant" /&gt;
          &lt;item
              android:id="@+id/author_aurelius"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Marcus Aurelius" /&gt;
          &lt;item
              android:id="@+id/author_descartes"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Rene Descartes" /&gt;
          &lt;item
              android:id="@+id/author_schopenhauer"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Arthur Schopenhauer" /&gt;
          &lt;item
              android:id="@+id/author_confucius"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Confucius" /&gt;
          &lt;item
              android:id="@+id/author_russell"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Bertrand Russell" /&gt;
          &lt;item
              android:id="@+id/author_sartre"
              android:icon="@drawable/ic_person_black_48dp"
              android:title="Jean-Paul Sartre" /&gt;
  
      &lt;/group
  
  &lt;/menu&gt;
  </code></pre>
  
  <p>some people have suggested to assign it inside activity_main.xml. but that doesn't work either.. </p>
  
  <pre><code>&lt;android.support.design.widget.NavigationView
          android:id="@+id/nav_view"
          android:layout_width="wrap_content"
          android:layout_height="match_parent"
          android:layout_gravity="start"
          android:fitsSystemWindows="true"
          app:headerLayout="@layout/nav_header_main"
          app:menu="@menu/activity_main_drawer"&gt;
  
      &lt;/android.support.design.widget.NavigationView &gt;
  </code></pre>