mobile/src/main/res/layout/fragment_search.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright 2019 Google LLC
  ~
  ~ 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.
  -->

<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <data>

        <variable
            name="viewModel"
            type="com.google.samples.apps.iosched.ui.search.SearchViewModel" />
    </data>

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/appbar"
            style="@style/Widget.IOSched.AppBar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true">

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

                <!-- Toolbar doesn't support layout_weight, so use intermediary LinearLayout. -->
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:divider="?android:dividerHorizontal"
                    android:dividerPadding="@dimen/spacing_normal"
                    android:orientation="horizontal"
                    android:showDividers="middle">

                    <SearchView
                        android:id="@+id/searchView"
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_weight="2"
                        android:iconifiedByDefault="false"
                        android:imeOptions="actionDone|flagNoExtractUi"
                        android:queryBackground="@color/transparent"
                        android:queryHint="@string/search_schedule_hint"
                        android:searchHintIcon="@null"
                        android:searchIcon="@null"
                        tools:targetApi="lollipop_mr1">

                    </SearchView>

                    <ViewStub
                        android:id="@+id/active_filters_wide_stub"
                        android:layout_width="0dp"
                        android:layout_height="wrap_content"
                        android:layout_weight="3"
                        android:layout="@layout/search_active_filters_wide"
                        app:viewModel="@{viewModel}" />
                </LinearLayout>

            </androidx.appcompat.widget.Toolbar>

            <ViewStub
                android:id="@+id/active_filters_narrow_stub"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout="@layout/search_active_filters_narrow"
                app:viewModel="@{viewModel}"
                tools:visibility="visible" />

        </com.google.android.material.appbar.AppBarLayout>

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/recyclerView"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:clipToPadding="false"
                android:orientation="vertical"
                android:paddingBottom="@dimen/spacing_normal"
                android:paddingTop="@dimen/spacing_normal"
                android:scrollbars="vertical"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:goneUnless="@{!viewModel.isEmpty}"
                app:layoutManager="LinearLayoutManager"
                tools:listitem="@layout/item_session" />

            <TextView
                android:id="@+id/empty"
                style="@style/Widget.IOSched.EmptyResults"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginHorizontal="@dimen/margin_large"
                android:layout_marginTop="?actionBarSize"
                android:text="@string/search_schedule_no_results"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:goneUnless="@{viewModel.isEmpty}"
                tools:targetApi="o"
                tools:visibility="visible" />

        </androidx.constraintlayout.widget.ConstraintLayout>

        <fragment
            android:id="@+id/filter_sheet"
            android:name="com.google.samples.apps.iosched.ui.search.SearchFilterFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="bottom"
            android:layout_marginBottom="?actionBarSize"
            app:layout_behavior="com.google.samples.apps.iosched.widget.BottomSheetBehavior"
            app:behavior_hideable="true"
            app:behavior_peekHeight="0dp"
            app:behavior_skipCollapsed="true"
            tools:ignore="FragmentTagUsage"
            tools:layout="@layout/fragment_filters" />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

</layout>