api實例

Helloworld.java
/*
* 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.example.android.apis.app;
// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import com.example.android.apis.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.example.android.apis/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 savedInstanceState)
{
// Be sure to call the super class.
super.onCreate(savedInstanceState);
// 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);
}
}