testapps/SmsManagerTestApp/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2017 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"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:paddingLeft="4dp">

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

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:layout_weight="0"
            android:text="Outgoing SMS Phone Number"/>

        <EditText
            android:id="@+id/phone_number_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:inputType="phone" android:text="5555551212"/>

        <View
            android:layout_width="match_parent"
            android:layout_height= "1dp"
            android:paddingRight="4dp"
            android:background="?android:attr/listDivider" />

        <Button
            android:id="@+id/send_text_button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingRight="4dp"
            android:text="@string/send_text_button"/>
        <Button
            android:id="@+id/send_text_button_service"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingRight="4dp"
            android:text="@string/send_text_service_button"/>
        <Button
            android:id="@+id/get_sub_for_result_button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingRight="4dp"
            android:text="@string/get_sub_for_result_button"/>
        <Button
            android:id="@+id/enable_persistent_service"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingRight="4dp"
            android:text="@string/enable_persistent_service"/>
        <Button
            android:id="@+id/disable_persistent_service"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingRight="4dp"
            android:text="@string/disable_persistent_service"/>
    </LinearLayout>
</LinearLayout>