title: Bring to front FAB on Android 4.4 or lower
body: <p>mi problem is that fab_bar button is placed behind the RecyclerView. This only happens in Android 4.4 or lower, in newest Android releases I don't have any problem.</p>
  
  <p>I do not have enough reputation to post pictures so I leave the link: <a href="http://i.stack.imgur.com/N5hYd.png" rel="nofollow">http://i.stack.imgur.com/N5hYd.png</a></p>
  
  <p>Is there any solution to this or is a bug?</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"
      android:id="@+id/main_content"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:fitsSystemWindows="true"&gt;
  
      &lt;android.support.design.widget.AppBarLayout
          android:id="@+id/appbar"
          android:layout_width="match_parent"
          android:fitsSystemWindows="true"
          android:layout_height="@dimen/detail_backdrop_height"
          android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"&gt;
  
          &lt;android.support.design.widget.CollapsingToolbarLayout
              android:id="@+id/collapsing_toolbar"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              app:layout_scrollFlags="scroll|exitUntilCollapsed"
              app:contentScrim="?attr/colorPrimary"
              android:fitsSystemWindows="true"
              android:elevation="@dimen/toolbar_shadow_elevation"&gt;
  
              &lt;android.support.v7.widget.Toolbar
                  android:id="@+id/toolbar"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                  app:layout_collapseMode="pin" /&gt;
  
          &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
  
      &lt;/android.support.design.widget.AppBarLayout&gt;
  
      &lt;android.support.design.widget.FloatingActionButton
          android:layout_height="wrap_content"
          android:id="@+id/fab_bar"
          android:layout_width="wrap_content"
          app:layout_anchor="@id/appbar"
          app:layout_anchorGravity="bottom|right|end"
          android:src="@drawable/ic_action_edit_light"
          android:layout_margin="@dimen/fab_margin"
          android:clickable="true"
          android:elevation="@dimen/fab_bar_shadow_elevation"/&gt;
  
      &lt;android.support.v7.widget.RecyclerView
          android:id="@+id/recycler_atrib_list"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          app:layout_behavior="@string/appbar_scrolling_view_behavior"/&gt;
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>