testapps/EmbmsTestDownloadApp/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2017 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
  -->

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scrolling_container"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/progress_window"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/downloaded_images"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scrollbars="horizontal"
            android:horizontalSpacing="10dp"
            android:gravity="center"/>
        <GridLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:columnCount="2"
            android:orientation="vertical" >
            <Button
                android:id="@+id/bind_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="0"
                android:layout_column="0"
                android:text="@string/bind_button" />
            <Button
                android:id="@+id/set_temp_root_button_internal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="0"
                android:layout_column="1"
                android:text="@string/set_temp_root_button_internal" />
            <Button
                android:id="@+id/set_temp_root_button_external"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="1"
                android:layout_column="0"
                android:text="@string/set_temp_root_button_external" />
            <Button
                android:id="@+id/get_file_services_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="1"
                android:layout_column="1"
                android:text="@string/get_file_services_button" />
            <Button
                android:id="@+id/request_dl_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="2"
                android:layout_column="0"
                android:text="@string/request_dl_button" />
            <Button
                android:id="@+id/request_cleanup_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="2"
                android:layout_column="1"
                android:text="@string/request_cleanup_button" />
            <Button
                android:id="@+id/request_spurious_temp_files_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="3"
                android:layout_column="0"
                android:text="@string/request_spurious_temp_files_button" />
            <Button
                android:id="@+id/delay_download_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="4"
                android:layout_column="0"
                android:text="@string/delay_download_button" />
            <EditText
                android:id="@+id/delay_factor"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:inputType="number"
                android:layout_row="4"
                android:layout_column="1"/>
            <Button
                android:id="@+id/cancel_download_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="5"
                android:layout_column="0"
                android:text="@string/cancel_download_button" />
            <Button
                android:id="@+id/register_all_callback_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="5"
                android:layout_column="1"
                android:text="@string/register_all_callback_button" />
            <Button
                android:id="@+id/register_state_callback_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="6"
                android:layout_column="0"
                android:text="@string/register_state_callback_button" />
            <Button
                android:id="@+id/register_progress_callback_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_row="6"
                android:layout_column="1"
                android:text="@string/register_progress_callback_button" />

            <Spinner
                android:id="@+id/active_downloads"
                android:layout_row="8"
                android:layout_column="1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>
        </GridLayout>

        <Spinner
            android:id="@+id/available_file_services"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>
</ScrollView>