title: Duplicate toolbar when trying to implement NavigationDrawer
body: <p>I'm trying to integrate a navigation drawer with my relative layout (which holds my activity content) and my toolbar. As you can see below, the toolbar is being duplicated within the interior relative layout as well as existing outside of it.</p>
  
  <p>The highlighted portion is the relative layout.
  Here is my XML:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  
      &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:tools="http://schemas.android.com/tools"
          android:id="@+id/landing_page"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:orientation="vertical"
          android:background="@color/frontPageBGColor"&gt;
  
          &lt;include
              android:id="@+id/app_bar"
              layout="@layout/app_bar"
              android:layout_height="wrap_content"
              android:layout_width="match_parent"/&gt;
  
          &lt;android.support.v4.widget.DrawerLayout
              xmlns:app="http://schemas.android.com/apk/res-auto"
              android:id="@+id/drawer_layout"
              android:layout_width="match_parent"
              android:layout_height="match_parent"&gt;
  
  
                  &lt;RelativeLayout
                      android:layout_width="match_parent"
                      android:layout_height="match_parent"&gt;
  
  
                  //Content Content Content
  
                  &lt;/RelativeLayout&gt;
  
  
  
              &lt;fragment
                  android:id="@+id/fragment_navigation_drawer"
                  android:layout_height="match_parent"
                  android:layout_width="280dp"
                  android:layout_gravity="start"
                  app:layout="@layout/fragment_navigation_drawer"
                  android:name="com.xxxxxxxx.chessgame.NavigationDrawerFragment"
                  tools:layout="@layout/fragment_navigation_drawer" /&gt;
  
          &lt;/android.support.v4.widget.DrawerLayout&gt;
      &lt;/LinearLayout&gt;
  </code></pre>