ring-android/app/src/main/res/layout/activity_home.xml

<?xml version="1.0" encoding="utf-8"?><!--
Copyright (C) 2004-2016 Savoir-faire Linux Inc.
                                                                    
Author: Alexandre Lision <alexandre.lision@savoirfairelinux.com>
Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or   
(at your option) any later version.                                 
                                                                    
This program is distributed in the hope that it will be useful,     
but WITHOUT ANY WARRANTY; without even the implied warranty of      
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the       
GNU General Public License for more details.                        
                                                                    
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software         
 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.          
-->

<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/relative_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".client.HomeActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/app_bar"
        app:elevation="0dp">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/main_toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:contentInsetStart="16dp"
            android:layout_alignParentTop="true">

            <Spinner
                android:id="@+id/spinner_toolbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="16dp"
                android:paddingStart="-60dp"
                android:dropDownWidth="260dp"/>

            <RelativeLayout
                android:id="@+id/tablet_toolbar"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginStart="100dp"
                android:visibility="gone">

                <ImageView
                    android:id="@+id/contact_image"
                    android:layout_width="36dp"
                    android:layout_height="36dp"
                    android:layout_alignParentStart="true"
                    android:layout_centerVertical="true"
                    tools:src="@drawable/ic_contact_picture_fallback" />

                <TextView
                    android:id="@+id/contact_title"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignTop="@+id/contact_image"
                    android:layout_toEndOf="@+id/contact_image"
                    android:layout_marginStart="16dp"
                    android:textSize="16sp"
                    android:textColor="@color/textColorPrimary"
                    tools:text="Thomas"/>

                <TextView
                    android:id="@+id/contact_subtitle"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignStart="@id/contact_title"
                    android:layout_below="@+id/contact_title"
                    android:textSize="14sp"
                    android:layout_toEndOf="@+id/contact_image"
                    tools:text="tom"/>

            </RelativeLayout>

        </com.google.android.material.appbar.MaterialToolbar>

    </com.google.android.material.appbar.AppBarLayout>

    <FrameLayout
        android:id="@+id/main_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/app_bar"
        android:layout_above="@id/navigation_view"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/navigation_view"
        android:layout_width="match_parent"
        android:layout_height="@dimen/navigation_bottom_height"
        app:menu="@menu/navigation_bar"
        app:labelVisibilityMode="labeled"
        android:layout_alignParentBottom="true"
        android:background="@color/bottom_navigation"
        />

</RelativeLayout>