packages/SystemUI/res/layout/keyboard_shortcuts_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2016 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/keyboard_shortcuts_wrapper"
        android:layout_width="488dp"
        android:layout_height="wrap_content"
        android:focusable="true">
    <ScrollView
            android:id="@+id/keyboard_shortcuts_scroll_view"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_weight="1">
        <LinearLayout
                android:id="@+id/keyboard_shortcuts_container"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical"/>
    </ScrollView>
    <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="?android:attr/listDivider"/>
</LinearLayout>