android-calculatorpp/app/src/main/res/layout/activity_tabs.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
  ~ Copyright 2013 serso aka se.solovyev
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~    http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  ~
  ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  ~ Contact details
  ~
  ~ Email: se.solovyev@gmail.com
  ~ Site:  http://se.solovyev.org
  -->

<android.support.design.widget.CoordinatorLayout
    android:id="@+id/main"
    style="@style/CppMain"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <include layout="@layout/activity_tabs_tablayout"/>

    </android.support.design.widget.AppBarLayout>

    <android.support.design.widget.FloatingActionButton
        app:layout_behavior="org.solovyev.android.calculator.view.PagerViewFabBehavior"
        android:id="@+id/fab"
        style="@style/CppFab" />

</android.support.design.widget.CoordinatorLayout>