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

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".client.QRCodeActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/qrAppBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:elevation="@dimen/toolbar_elevation"
        style="@style/Widget.MaterialComponents.AppBarLayout.Surface">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/qrToolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:layout_weight="1"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/AppTheme" />

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>