tools/photopicker/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
  Copyright 2021 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

      https://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.
  -->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <CheckBox
        android:id="@+id/cbx_get_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ACTION_GET_CONTENT"
        android:textSize="16sp" />

    <CheckBox
        android:id="@+id/cbx_allow_multiple"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ALLOW MULTIPLE"
        android:textSize="16sp" />

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

        <CheckBox
            android:id="@+id/cbx_set_image_only"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="SHOW IMAGE ONLY"
            android:textSize="16sp" />

        <CheckBox
            android:id="@+id/cbx_set_video_only"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="SHOW VIDEO ONLY"
            android:textSize="16sp" />
    </LinearLayout>

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

        <CheckBox
            android:id="@+id/cbx_set_mime_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="SET MIME TYPE"
            android:textSize="16sp" />

        <EditText
            android:id="@+id/edittext_mime_type"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:enabled="false"
            android:textSize="16sp" />
    </LinearLayout>

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

        <CheckBox
            android:id="@+id/cbx_set_selection_count"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="SET SELECTION COUNT"
            android:textSize="16sp" />

        <EditText
            android:id="@+id/edittext_max_count"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:enabled="false"
            android:text="10"
            android:textSize="16sp" />
    </LinearLayout>

    <Button
        android:id="@+id/launch_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Launch"
        android:textSize="16sp" />

    <ScrollView
        android:id="@+id/scrollview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:id="@+id/item_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>
</LinearLayout>