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

<?xml version="1.0" encoding="utf-8"?>
<!--
/*
**
** Copyright 2007, 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.
*/
-->
<view
    xmlns:android="http://schemas.android.com/apk/res/android"
    class="android.app.SearchDialog$SearchBar"
    android:id="@+id/search_bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="@color/transparent"
    android:focusable="true"
    android:descendantFocusability="afterDescendants">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?android:attr/actionModeBackground"
        android:orientation="horizontal">

        <!-- Grouped to allow tapping on either item to exit search mode -->
        <LinearLayout
            android:id="@id/closeButton"
            android:layout_width="wrap_content"
            android:layout_height="48dp"
            android:orientation="horizontal"
            android:focusable="true"
            android:background="?android:attr/selectableItemBackground">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:src="?android:attr/homeAsUpIndicator"/>

            <ImageView
                android:id="@+id/search_app_icon"
                android:layout_height="32dip"
                android:layout_width="32dip"
                android:layout_gravity="center_vertical"
                android:scaleType="centerInside"
            />

        </LinearLayout>

        <!-- Actual search view with search icon, text field, close
            and voice buttons -->
        <SearchView
            android:id="@+id/search_view"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:maxWidth="600dip"
            android:layout_gravity="center_vertical"
            />

    </LinearLayout>

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="fitXY"
        android:src="@drawable/ab_solid_shadow_holo"/>
</view>