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

<?xml version="1.0" encoding="utf-8"?>
<!--
**
** Copyright 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.internal.widget.DecorCaptionView xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:descendantFocusability="beforeDescendants" >
    <LinearLayout
            android:id="@+id/caption"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="end"
            android:background="@drawable/decor_caption_title"
            android:focusable="false"
            android:descendantFocusability="blocksDescendants" >
        <Button
                android:id="@+id/maximize_window"
                android:layout_width="32dp"
                android:layout_height="32dp"
                android:layout_margin="5dp"
                android:padding="4dp"
                android:layout_gravity="center_vertical|end"
                android:contentDescription="@string/maximize_button_text"
                android:background="@drawable/decor_maximize_button_dark" />
        <Button
                android:id="@+id/close_window"
                android:layout_width="32dp"
                android:layout_height="32dp"
                android:layout_margin="5dp"
                android:padding="4dp"
                android:layout_gravity="center_vertical|end"
                android:contentDescription="@string/close_button_text"
                android:background="@drawable/decor_close_button_dark" />
    </LinearLayout>
</com.android.internal.widget.DecorCaptionView>