lifecycle/integration-tests/TestApp/app/src/main/res/layout/activity.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2015 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.
  -->
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/root">
        <fragment
            android:id="@+id/main_fragment"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:tag="fragment_tag"
            android:name="com.android.support.lifecycle.testapp.UsualFragment"
            tools:context="com.android.support.lifecycle.testapp.MainActivity">
        </fragment>
    </FrameLayout>
</FrameLayout>