krackattacks/wpadebug/res/layout/qrcode.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:gravity="center_horizontal">
	<ImageView
		android:id="@+id/qrCode"
		android:layout_width="350dp"
		android:layout_height="350dp"
		android:layout_marginTop="20dp"
		/>
</LinearLayout>