sdk/platforms/android-27/data/res/layout/notification_material_reply_text.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2015 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
  -->

<!-- Note: this layout is included from a view stub; layout attributes will be overridden. -->
<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/notification_material_reply_container"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingStart="@dimen/notification_content_margin_start">

    <ImageView
            android:layout_width="match_parent"
            android:layout_height="1dip"
            android:id="@+id/action_divider"
            android:layout_marginBottom="15dp"
            android:background="@drawable/notification_template_divider" />

    <TextView
            android:id="@+id/notification_material_reply_text_3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="@dimen/notification_content_margin_end"
            android:visibility="gone"
            android:textAppearance="@style/TextAppearance.Material.Notification.Reply"
            android:singleLine="true" />

    <TextView
            android:id="@+id/notification_material_reply_text_2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="@dimen/notification_content_margin_end"
            android:visibility="gone"
            android:textAppearance="@style/TextAppearance.Material.Notification.Reply"
            android:singleLine="true" />

    <TextView
            android:id="@+id/notification_material_reply_text_1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="15dp"
            android:layout_marginEnd="@dimen/notification_content_margin_end"
            android:textAppearance="@style/TextAppearance.Material.Notification.Reply"
            android:singleLine="true" />

</LinearLayout>