title: Add horizontal views (line) between menu items xml
body: <p>I'm using Navigation View, tags menu and items, I would like to add lines between every option item. Here is my menu:</p>
  
  <pre><code>&lt;group android:checkableBehavior="single"&gt;
      &lt;item
          android:id="@+id/nav_camera"
          android:icon="@drawable/ic_menu_camera"
          android:title="Import" /&gt;
      &lt;item
          android:id="@+id/nav_gallery"
          android:icon="@drawable/ic_menu_gallery"
          android:title="Gallery" /&gt;
      &lt;item
          android:id="@+id/nav_slideshow"
          android:icon="@drawable/ic_menu_slideshow"
          android:title="Slideshow" /&gt;
      &lt;item
          android:id="@+id/nav_manage"
          android:icon="@drawable/ic_menu_manage"
          android:title="Tools" /&gt;
  &lt;/group&gt;
  </code></pre>
  
  <p>I don't know well how this item works and why we can not put other classes of tags from XML.</p>