testapps/ImsTestService/res/layout/activity_config.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2018 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"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:paddingLeft="4dp">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textStyle="bold"
        android:text="Set Configuration Value"/>

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingLeft="4dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:layout_weight="0"
            android:text="Item"/>

        <EditText
            android:id="@+id/set_config_item"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:inputType="number" android:text="0"/>
    </LinearLayout>

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingLeft="4dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:layout_weight="0"
            android:text="Value"/>

        <EditText
            android:id="@+id/set_config_value"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:inputType="number" android:text="0"/>
    </LinearLayout>

    <Button
        android:id="@+id/config_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingRight="4dp"
        android:text="Set"/>

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textStyle="bold"
        android:text="Cached Config Values"/>

    <ListView
        android:id="@+id/config_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>