Signal-Android/app/src/main/res/layout/device_add_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:viewBindingIgnore="true"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/halfway_guideline"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.5" />

    <org.signal.qr.QrScannerView
        android:id="@+id/scanner"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@+id/halfway_guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <org.thoughtcrime.securesms.components.ShapeScrim
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@+id/halfway_guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="?android:windowBackground"
        android:gravity="center"
        android:orientation="vertical"
        android:paddingStart="16dp"
        android:paddingEnd="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/halfway_guideline">

        <androidx.appcompat.widget.AppCompatImageView
            android:id="@+id/devices"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:src="@drawable/ic_devices_white"
            android:tint="@color/core_grey_25"
            android:transitionName="devices" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/device_add_fragment__scan_the_qr_code_displayed_on_the_device_to_link"
            android:textColor="?android:textColorSecondary" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>