<PreferenceScreen  xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">
  <Preference
      app:key="Scan"
      app:title="Scan now"
      app:selectable="false"
      app:summary="Scan the QR code on the trusted device in the rectangle below"/>

  <com.android.settingslib.widget.LayoutPreference
      android:key="qr_code"
      app:selectable="false"
      android:layout="@layout/qrcode_scanner" />

  <Preference
      app:key="Continue"
      app:title="Continue"
      app:selectable="false"
      app:summary="Once you have successfully scanned the QR code, this device will automatically
start a series of tests." />

  <PreferenceCategory
      app:key="Devices"
      app:summary="Alternatively select the device from the list below"
      app:title="Select trusted device"
      app:selectable="false"/>
</PreferenceScreen>
