samples/ApiDemos/res/layout/picture_in_picture.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2018 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.
  -->

<!--
  Demonstrates Picture-In-Picture with various configurations.
      - Enter PiP with on-screen button
      - Enter PiP by swiping up to home or tap on home button
      - Toggle the auto enter PiP flag on and off
      - Toggle the source rect hint on and off
      - Toggle the seamless resize flag on and off
      - Change the position of current and next source rect hint
      - Tablet layout on foldables
      - Enter content PiP
  -->
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <!-- layout params would be changed programmatically -->
    <include layout="@layout/picture_in_picture_content" />

    <ScrollView
        android:id="@+id/control_group"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <Switch
                android:id="@+id/auto_pip_toggle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="@string/activity_picture_in_picture_auto_pip_toggle" />

            <Switch
                android:id="@+id/source_rect_hint_toggle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="@string/activity_picture_in_picture_source_rect_hint_toggle" />

            <Switch
                android:id="@+id/seamless_resize_toggle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="@string/activity_picture_in_picture_seamless_resize_toggle" />

            <Switch
                android:id="@+id/enter_pip_on_back"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:text="@string/activity_picture_in_picture_enter_pip_on_back_toggle" />

            <RadioGroup
                android:id="@+id/current_position"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:padding="8dp">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/label_current_position" />

                <RadioButton
                    android:id="@+id/radio_current_start"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/label_position_start" />

                <RadioButton
                    android:id="@+id/radio_current_end"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/label_position_end" />

            </RadioGroup>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="8dp"
                android:orientation="horizontal">

                <TextView
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="@string/label_aspect_ratio" />

                <Spinner
                    android:id="@+id/aspect_ratio"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1" />
            </LinearLayout>

            <Button
                android:id="@+id/enter_pip_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/enter_picture_in_picture" />

            <Button
                android:id="@+id/enter_content_pip_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/enter_content_pip" />

        </LinearLayout>

    </ScrollView>

</LinearLayout>