tests/WindowInsetsTests/res/layout/chat_activity.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
  -->

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipToPadding="false"
    android:id="@+id/root">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        />

    <FrameLayout
        android:id="@+id/scrollView"
        android:layout_height="0dp"
        android:layout_width="match_parent"
        android:paddingStart="8dp"
        android:paddingEnd="8dp"
        android:layout_weight="1">

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

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                style="@style/bubble"
                android:text="Hey, look at this buttery smooth animation!" />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                style="@style/bubble_self"
                android:text="Wow, that's pretty neat, how does this work?" />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                style="@style/bubble"
                android:text="Using the new WindowInsets animation system of course!" />

        </LinearLayout>

    </FrameLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingStart="8dp"
        android:paddingEnd="8dp"
        android:id="@+id/editText">

        <com.google.android.material.textfield.TextInputLayout
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1">

            <com.google.android.material.textfield.TextInputEditText
                android:hint="Text message"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>

        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/floating_action_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            app:elevation="0dp"
            app:fabSize="mini"
            app:srcCompat="@drawable/ic_send"/>

    </LinearLayout>
</LinearLayout>