title: Navigation view has more gap before first menu
body: <p>I have created navigation drawer. I tried to create drawer and navigation view below the toolbar. But It shows more gap before first menu of navigation view. I want to reduce this gap. Any solution for this?</p>
  
  <p><a href="https://i.stack.imgur.com/8heAB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8heAB.png" alt="enter image description here"></a></p>
  
  <p>Layout main:</p>
  
  <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      xmlns:tools="http://schemas.android.com/tools"
      android:fitsSystemWindows="true"
      android:orientation="vertical"&gt;
  
      &lt;android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:app="http://schemas.android.com/apk/res-auto"
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="?attr/actionBarSize"
          android:background="?attr/colorPrimary"/&gt;
  
      &lt;android.support.v4.widget.DrawerLayout
          xmlns:app="http://schemas.android.com/apk/res-auto"
          android:id="@+id/nav_drawer"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:fitsSystemWindows="true"&gt;
  
  
      &lt;!-- Real content goes here --&gt;
          &lt;FrameLayout
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:id="@+id/nav_contentframe"
              android:background="@android:color/background_light"
              android:layout_below="@+id/toolbar"/&gt;
  
          &lt;!-- The navigation drawer --&gt;
          &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="false"
              app:menu="@menu/nav_menu"
              android:background="@android:color/background_light"
              android:gravity="top"
              android:foregroundGravity="top"
              android:weightSum="0" /&gt;
  
  
      &lt;/android.support.v4.widget.DrawerLayout&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>How to solve this?</p>
  
  <p>Thank you.</p>