Android编程第一个例子：HelloWorld-- ZDNet软件频道

/*
* Copyright (C) 2007 Google Inc.
*
* 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.
*/

package com.google.Android.samples.app;

// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import com.google.Android.samples.R;

import Android.app.Activity;
import Android.os.Bundle;

/**
* Simple example of writing an application Activity.
* Hello World</a></h3>

<p>This demonstrates the basic code needed to write a Screen activity.</p>

<h4>Demo</h4>
App/Activity/Hello World

<h4>Source files</h4>
* <table class="LinkTable">
*       <tr>
*          <td >src/com/google/Android/samples/app/HelloWorld.java</td>
*          <td >The Hello World Screen implementation</td>
*       </tr>
*       <tr>
*          <td >/res/any/layout/hello_world.xml</td>
*          <td >Defines contents of the screen</td>
*       </tr>
* </table>
*/
public class HelloWorld extends Activity
{
/**
   * Initialization of the Activity after it is first created.  Must at least
   * call {@link Android.app.Activity#setContentView setContentView()} to
   * describe what is to be displayed in the screen.
   */
@Override
      protected void onCreate(Bundle icicle)
{
      // Be sure to call the super class.
      super.onCreate(icicle);

      // See assets/res/any/layout/hello_world.xml for this
      // view layout definition, which is being set here as
      // the content of our screen.
      setContentView(R.layout.hello_world);
}
}