title: The Button Bar Overlapping with recycler view issue
body: <p>I am trying to add a button bar at the bottom of a screen which already contains a recycler view. When i do so the button bar overlaps the last item of the recycler view and if i try to click on the button bar the item under it in the recycler view gets clicked. Here is my xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.design.widget.CoordinatorLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:fitsSystemWindows="true"
  tools:context="com.example.owaisnizami.navigation.MainActivity"&gt;
  
  &lt;android.support.design.widget.AppBarLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:theme="@style/AppTheme.AppBarOverlay"&gt;
  
      &lt;android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="?attr/actionBarSize"
          android:background="?attr/colorPrimary"
          app:popupTheme="@style/AppTheme.PopupOverlay" /&gt;
  
      &lt;/android.support.design.widget.AppBarLayout&gt;
  
  
  
  
      &lt;include layout="@layout/content_main"/&gt;
  
      &lt;LinearLayout
      android:id="@+id/buttonBar"
      android:layout_width="match_parent"
  
  
      android:layout_height="wrap_content"
  
      android:layout_alignParentBottom="true"
      style="@android:style/ButtonBar"
      android:background="#F44336"
      android:layout_gravity="bottom|end"&gt;
      &lt;TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:textSize="30sp"
          android:layout_gravity="center"
          android:text="Advertisements Here"
          android:textColor="#FFFFFF"/&gt;
  &lt;/LinearLayout&gt;
  
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p>content_main contains the recycler view and here is its xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  app:layout_behavior="@string/appbar_scrolling_view_behavior"
  tools:showIn="@layout/activity_main"
  tools:context=".MainActivity"&gt;
  
  &lt;android.support.v7.widget.RecyclerView
      android:id="@+id/recycler_view"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:scrollbars="vertical"/&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>