Android Notification下载实例

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <Button
        android:id="@+id/btn_start_service"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="start service" />
</LinearLayout

   activity:

  public class MainActivity extends Activity {

  private Button btn_start_service;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		btn_start_service=(Button)findViewById(R.id.btn_start_service);
		btn_start_service.setOnClickListener(clickListener);
	}
	private OnClickListener clickListener=new OnClickListener() {
		
		@Override
		public void onClick(View v) {
			Intent intent=new Intent(MainActivity.this,StatusService.class);
			startService(intent);
		}
	};
	@Override
	protected void onStart() {
		// TODO Auto-generated method stub
		super.onStart();
		NotificationManager manager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
		manager.cancel(R.layout.main);// 下载完成后，点击后，移除NotificationManager
	}
}

  services:

public class StatusService extends IntentService
{

	private static final String TAG = "StatusService";

	// private static final int KUKA = 0;

	public StatusService()
	{
		super("StatusService");
	}

	@Override
	protected void onHandleIntent(Intent intent)
	{
		Log.i(TAG, "开始下载....");
		showNotification(false);//开始下载
		try
		{
			Thread.sleep(10000);
			showNotification(true);//下载完成
		} catch (InterruptedException e)
		{
			e.printStackTrace();
		}
		Log.i(TAG, "程序下载完毕");
	}

	// finish下载是否完成
	private void showNotification(boolean finish)
	{
		Notification notification;
		NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
		Intent intent = new Intent(this, MainActivity.class);//下拉点击执行的activity
		PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
		if (!finish)
		{
			//图标 下载提示  时间
			notification = new Notification(R.drawable.head, "开始下载", System.currentTimeMillis());
			//显示在拉伸状态栏中的Notification属性，点击后将发送PendingIntent对象。
			notification.setLatestEventInfo(this, "下载", "正在下载中", contentIntent);
		}
		else
		{
			notification = new Notification(R.drawable.head, "下载完毕", System.currentTimeMillis());
			notification.setLatestEventInfo(this, "下载", "程序下载完毕", contentIntent);
		}
		//下载的默认声音
		notification.defaults= Notification.DEFAULT_SOUND;
		//r.layout.main是为manager指定一个唯一的id
		manager.notify(R.layout.main, notification);//将自定义的notification放入NotificationManager
		
	}
}

 最后别忘记注册service

<service android:name=".StatusService"/>

更多详细介绍：

http://blog.csdn.net/qinjuning/article/details/6915482