session-android/res/layout/fragment_scan_qr_code.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <org.thoughtcrime.securesms.components.camera.CameraView
        android:id="@+id/cameraView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:camera="0" />

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

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

        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:padding="32dp"
            android:gravity="center"
            android:background="@color/loki_darkest_gray"
            android:text="@string/fragment_scan_qr_code_explanation"
            android:textColor="?android:textColorPrimary" />

    </LinearLayout>

</FrameLayout>