rtc_tools/network_tester/androidapp/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingStart="@dimen/activity_horizontal_margin"
    android:paddingEnd="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.google.media.networktester.MainActivity">
    <Button
      android:text="@string/start_test"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentTop="true"
      android:layout_alignParentStart="true"
      android:id="@+id/start_button"/>
    <Button
      android:text="@string/interrupt_test"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentTop="true"
      android:layout_toEndOf="@+id/start_button"
      android:id="@+id/stop_button"/>

</RelativeLayout>