效果图：

实现方法：

MainActivity:

package com.example.test;

import android.app.Activity;
import android.os.Bundle;


public class MainActivity extends Activity {


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}
}

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context="com.example.test.MainActivity" >


    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/title" 
        style="@style/text"/>
    
    <TextView
        android:id="@+id/startButton"
        android:layout_gravity="center_vertical|center_horizontal"
        android:text="@string/start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="@style/text"/>
</FrameLayout>


res/values/strings.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>


    <string name="app_name">test3.1</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string name="title">使用XML布局文件控制UI界面</string>
    <string name="start">单击开始游戏</string>


</resources>

<resources xmlns:android="http://schemas.android.com/apk/res/android">
    
     <style name="text">
       <item name="android:textSize">24px</item>
       <item name="android:textColor">#111111</item>
    </style>
	 
    <style name="AppBaseTheme" parent="android:Theme.Light"> 
    </style>


    <style name="AppTheme" parent="AppBaseTheme">
    </style>
</resources>