sample/src/main/res/layout/qrscan_activity.xml

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

    <com.dlazaro66.qrcodereaderview.QRCodeReaderView
        android:id="@+id/qrView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <TextView
        android:id="@+id/textScanPrompt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="@android:color/black"
        android:gravity="center"
        android:padding="8dp"
        android:text="@string/scan_prompt"
        android:textColor="@android:color/white"/>


    <ImageView
        android:id="@+id/scannerOverlay"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_gravity="center"
        android:contentDescription="@string/qr_code_overlay"
        app:srcCompat="@drawable/ic_qr_overlay"/>


</FrameLayout>