android_frameworks_base/packages/SystemUI/res/layout/hybrid_notification.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
  -->

<com.android.systemui.statusbar.notification.HybridNotificationView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingStart="@*android:dimen/notification_content_margin_start"
    android:paddingEnd="12dp"
    android:gravity="bottom">
    <TextView
        android:id="@+id/notification_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingEnd="4dp"
        android:singleLine="true"
        android:textAppearance="@*android:style/TextAppearance.Material.Notification.Title"
    />
    <TextView
        android:id="@+id/notification_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingEnd="4dp"
        android:textAppearance="@*android:style/TextAppearance.Material.Notification"
        android:singleLine="true"
        />
</com.android.systemui.statusbar.notification.HybridNotificationView>