tests/MultiDisplaySecondaryHomeTestLauncher/res/layout/app_picker_layout.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.
  -->

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.circularreveal.cardview.CircularRevealCardView
        android:id="@+id/FloatingSheet"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="invisible">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginStart="@dimen/app_grid_margin_left"
            android:layout_marginEnd="@dimen/app_grid_margin_right"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/app_grid_margin_top"
                android:orientation="horizontal">

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

                <ImageButton
                    android:id="@+id/RefreshButton"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:src="@drawable/ic_refresh"
                    android:background="@null"/>
            </LinearLayout>

            <CheckBox
                android:id="@+id/NewInstanceCheckBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/app_grid_margin_top"
                android:text="@string/new_instance" />

            <GridView
                android:id="@+id/app_grid"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="@dimen/app_grid_margin_top"
                android:columnWidth="@dimen/app_list_col_width"
                android:verticalSpacing="@dimen/app_list_horizontal_spacing"
                android:horizontalSpacing="@dimen/app_list_vertical_spacing"
                android:numColumns="auto_fit" />
        </LinearLayout>
    </com.google.android.material.circularreveal.cardview.CircularRevealCardView>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/FloatingActionButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:src="@drawable/ic_apps"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>