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

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

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1">

    <org.signal.qr.QrScannerView
        android:id="@+id/scanner"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:id="@+id/overlay"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:weightSum="2">

        <org.thoughtcrime.securesms.components.ShapeScrim
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?android:windowBackground"
            android:gravity="center"
            android:orientation="vertical"
            android:paddingStart="16dp"
            android:paddingEnd="16dp">

            <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>
    </LinearLayout>

</FrameLayout>