res/layout/face_enroll_enrolling.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2018 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  -->

<com.android.setupwizardlib.GlifLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/setup_wizard_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    style="?attr/face_layout_theme"
    app:suwFooter="@layout/face_enroll_enrolling_footer">

    <LinearLayout
        style="@style/SuwContentFrame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:clipToPadding="false"
        android:clipChildren="false">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:gravity="center"
            android:orientation="vertical">

            <com.android.settings.biometrics.face.FaceSquareFrameLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1">

                <com.android.settings.biometrics.face.FaceSquareTextureView
                    android:id="@+id/texture_view"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:contentDescription="@null" />

                <ImageView
                    android:id="@+id/circle_view"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" />

            </com.android.settings.biometrics.face.FaceSquareFrameLayout>

            <TextView
                style="@style/TextAppearance.FaceErrorText"
                android:id="@+id/error_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal|bottom"
                android:accessibilityLiveRegion="polite"
                android:gravity="center"
                android:visibility="invisible"/>

        </LinearLayout>

    </LinearLayout>

</com.android.setupwizardlib.GlifLayout>