java/com/android/dialer/main/impl/res/layout/main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2017 The Android Open Source Project
  ~
  ~ 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
  -->
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

  <TextView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:textColor="@android:color/secondary_text_dark_nodisable"/>

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

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppBarTheme">

      <android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_height="wrap_content"
          android:layout_width="match_parent"
          android:background="?android:attr/colorPrimary"/>

      <android.support.design.widget.TabLayout
          android:id="@+id/tab_layout"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:background="?android:attr/colorPrimary"
          app:tabIndicatorColor="?android:attr/colorAccent"
          app:layout_scrollFlags="enterAlwaysCollapsed"/>
    </android.support.design.widget.AppBarLayout>

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

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="16dp"
        android:src="@drawable/quantum_ic_dialpad_white_24"
        app:backgroundTint="?android:attr/colorAccent"/>
  </android.support.design.widget.CoordinatorLayout>
</FrameLayout>