Spherical/app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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:id="@+id/lay_root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="false"
    android:background="@android:color/background_dark"
    tools:context="de.trac.spherical.MainActivity">

    <android.support.v7.widget.Toolbar
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:fitsSystemWindows="true"
        android:background="@android:color/transparent"
        android:layout_alignParentTop="true"
        app:layout_scrollFlags="scroll|enterAlways|snap"
        app:theme="@style/AppTheme.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat" />



    <FrameLayout
        android:id="@+id/container_fragment"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:layout_editor_absoluteY="8dp"
        tools:layout_editor_absoluteX="8dp">
    </FrameLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:src="@drawable/ic_explore_white_48px"
        app:fabSize="mini"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="64dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_anchor="@id/container_fragment"
        app:layout_anchorGravity="bottom|right|end" />

</RelativeLayout>