1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:background="#ff0000"
 6     android:orientation="horizontal" >
 7     
 8     <TextView 
 9         android:id="@+id/hello"
10         android:layout_width="match_parent"
11         android:layout_height="wrap_content"
12         android:text="@string/hello_world"
13         android:textSize="20sp"
14         android:layout_gravity="center"
15         android:gravity="center"
16         android:textColor="#ff000000"/>
17 
18 </LinearLayout>

 1 package com.helloworld;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 
 6 public class MainActivity extends Activity {
 7 
 8     @Override
 9     protected void onCreate(Bundle savedInstanceState) {
10         super.onCreate(savedInstanceState);
11         setContentView(R.layout.activity_main);
12     }
13 }