wmss

<?xml version="1.0" encoding="utf-8"?>
<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="match_parent"
    android:background="#e9e9e9"
    android:orientation="vertical"
    tools:context="com.example.android.test.MainActivity">

    <LinearLayout