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content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    android:id="@+id/content_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.google.android.example.basicawarenesssample.MainActivity"
    tools:showIn="@layout/activity_main">

<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/sample_main_layout">
        <TextView android:id="@+id/sample_output"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="@string/app_name"
            android:padding="@dimen/textview_padding" />
        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/separator_length"
            android:background="@android:color/darker_gray"/>
        <fragment
            android:name="com.example.android.common.logger.LogFragment"
            android:id="@+id/log_fragment"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </LinearLayout>

</android.support.constraint.ConstraintLayout>