title: FloatingActionButton with BottomNavigationView
body: <p>I cant position my FAB. It should be bottom right, but on top of the BottonNavigationView. </p>
  
  <p>1) Can i achieve this without RelativeLayout inside coordinateLayout?</p>
  
  <p>2) Show me how</p>
  
  <p>3) Should i use FrameLayout as a container for fragments?</p>
  
  <pre><code>&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:layout_height="wrap_content"
      android:paddingTop="@dimen/appbar_padding_top"
      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:layout_scrollFlags="scroll|enterAlways"
          app:popupTheme="@style/AppTheme.PopupOverlay"&gt;
  
      &lt;/android.support.v7.widget.Toolbar&gt;
  
  &lt;/android.support.design.widget.AppBarLayout&gt;
  
  &lt;FrameLayout
      android:id="@+id/fragment_container"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      app:layout_behavior="@string/appbar_scrolling_view_behavior"&gt;
  
  &lt;/FrameLayout&gt;
  
  &lt;android.support.design.widget.FloatingActionButton
      android:id="@+id/fab_electricity"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="end|bottom"
      android:layout_margin="@dimen/fab_margin"
      app:layout_anchorGravity="bottom|right|end"
      app:srcCompat="@drawable/ic_add_electro" /&gt;
  
  &lt;android.support.design.widget.BottomNavigationView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_gravity="bottom"&gt;
  
  &lt;/android.support.design.widget.BottomNavigationView&gt;
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/BCLTF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BCLTF.png" alt="result"></a></p>