packages/SystemUI/res/layout/fingerprint_dialog.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
  -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="bottom"
    android:background="@color/fingerprint_dialog_dim_color"
    android:orientation="vertical">

    <!-- This is not a Space since Spaces cannot be clicked -->
    <View
        android:id="@+id/space"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <LinearLayout
        android:id="@+id/dialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:elevation="2dp"
        android:background="@drawable/fingerprint_dialog_bg">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:elevation="2dp">

            <ImageView
                android:id="@+id/icon"
                android:layout_width="@dimen/fingerprint_dialog_icon_size"
                android:layout_height="@dimen/fingerprint_dialog_icon_size"
                android:layout_marginTop="16dp"
                android:layout_marginStart="16dp"
                android:scaleType="centerInside" />

            <TextView
                android:id="@+id/title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_toRightOf="@+id/icon"
                android:layout_marginEnd="16dp"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:textSize="20sp"
                android:maxLines="1"
                android:singleLine="true"
                android:ellipsize="marquee"
                android:marqueeRepeatLimit="marquee_forever"
                android:textColor="@color/fingerprint_dialog_text_color"/>

            <TextView
                android:id="@+id/subtitle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_toRightOf="@+id/icon"
                android:layout_below="@+id/title"
                android:layout_marginEnd="16dp"
                android:layout_marginStart="16dp"
                android:layout_marginTop="4dp"
                android:textSize="12sp"
                android:maxLines="2"
                android:textColor="@color/fingerprint_dialog_text_color"/>

        </RelativeLayout>

        <TextView
            android:id="@+id/description"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="16dp"
            android:layout_marginStart="16dp"
            android:paddingTop="16dp"
            android:paddingBottom="20dp"
            android:textSize="16sp"
            android:maxLines="4"
            android:textColor="@color/fingerprint_dialog_text_color"/>

        <ImageView
            android:id="@+id/fingerprint_icon"
            android:layout_width="@dimen/fingerprint_dialog_fp_icon_size"
            android:layout_height="@dimen/fingerprint_dialog_fp_icon_size"
            android:layout_gravity="center_horizontal"
            android:scaleType="centerInside"
            android:src="@drawable/fingerprint_icon"/>

        <TextView
            android:id="@+id/error"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd = "16dp"
            android:layout_marginStart="16dp"
            android:paddingTop="16dp"
            android:paddingBottom="60dp"
            android:textSize="12sp"
            android:visibility="invisible"
            android:gravity="center_horizontal"
            android:textColor="@color/fingerprint_error_message_color"/>

        <LinearLayout android:id="@+id/buttonPanel"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:minHeight="54dip"
            android:orientation="vertical" >
            <LinearLayout
                style="?android:attr/buttonBarStyle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:paddingTop="4dip"
                android:paddingStart="2dip"
                android:paddingEnd="2dip"
                android:measureWithLargestChild="true">
                <LinearLayout android:id="@+id/leftSpacer"
                    android:layout_weight="0.25"
                    android:layout_width="0dip"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:visibility="gone" />
                <!-- Positive Button -->
                <Button android:id="@+id/button1"
                    android:layout_width="0dip"
                    android:layout_gravity="start"
                    android:layout_weight="1"
                    style="?android:attr/buttonBarButtonStyle"
                    android:maxLines="2"
                    android:layout_height="wrap_content"/>
                <!-- Negative Button -->
                <Button android:id="@+id/button2"
                    android:layout_width="0dip"
                    android:layout_gravity="end"
                    android:layout_weight="1"
                    style="?android:attr/buttonBarButtonStyle"
                    android:maxLines="2"
                    android:layout_height="wrap_content" />
                <LinearLayout android:id="@+id/rightSpacer"
                    android:layout_width="0dip"
                    android:layout_weight="0.25"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:visibility="gone" />
            </LinearLayout>
        </LinearLayout>
    </LinearLayout>

</LinearLayout>