title: Show the ListView and my bar together doesn't work
body: <p>I'm right now coding an simple feature into my app. Just have a look on my <a href="http://i.stack.imgur.com/vmN6G.png" rel="nofollow">screenshot</a> - I don't know why my tab is everytime behind the listview. Could you please help me?</p>
  
  <p>Thank you for your help!</p>
  
  <p>Best regards</p>
  
  <p>listview.xml</p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      xmlns:app="http://schemas.android.com/apk/res-auto"&gt;
  
      &lt;ListView xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/listview"
          android:layout_width="fill_parent"
          android:layout_height="match_parent" /&gt;
  
      &lt;android.support.design.widget.FloatingActionButton
          android:id="@+id/fab"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:clickable="true"
          android:src="@android:drawable/ic_input_add"
          app:layout_anchor="@+id/listview"
          android:layout_marginLeft="16dp"
          android:layout_marginRight="16dp"
          android:layout_alignParentBottom="true"
          android:layout_alignParentEnd="true"
          android:nestedScrollingEnabled="false" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <hr>
  
  <p>styles.xml</p>
  
  <pre><code>&lt;resources&gt;
  
      &lt;!-- Base application theme. --&gt;
      &lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
          &lt;!-- Customize your theme here. --&gt;
          &lt;item name="colorPrimary"&gt;@color/colorPrimary&lt;/item&gt;
          &lt;item name="colorPrimaryDark"&gt;@color/colorPrimaryDark&lt;/item&gt;
          &lt;item name="colorAccent"&gt;@color/colorAccent&lt;/item&gt;
      &lt;/style&gt;
  
      &lt;style name="AppTheme.NoActionBar"&gt;
          &lt;item name="windowActionBar"&gt;false&lt;/item&gt;
          &lt;item name="windowNoTitle"&gt;true&lt;/item&gt;
      &lt;/style&gt;
  
      &lt;style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" /&gt;
  
      &lt;style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" /&gt;
  
  &lt;/resources&gt;
  </code></pre>