widget ----notification

	NotificationManager notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
Notification notification = new Notification(icon, tickerText, System.currentTimeMillis());
//System.currentTimeMillis()代表立即显示，这里是设置显示的时间		
		Intent intent = new Intent(this,MainActibity.class);
		
		PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, 0);//这里的intent是如果这个notification被点击后返回到MainActivity页面
		
		notification.setLatestEventInfo(this, title, content, contentIntent);
		
		notificationManager.notify(R.layout.notification, notification);//第一个是notification的id,可以自己指定

所有的Notification都是由NotificationManager来管理，所以，第一步应该得到一个NotificationManager,以便管理这个Activity.

Notification notification = new Notification();
		notification.defaults = Notification.DEFAULT_VIBRTE;
//当Notification出现的时候便随着振动

notification.defaults = Notification.DEFAULT_SOUND；//当Notification出现的时候便随着音乐

notification.defaults = Notification.DEFAULT_ALL；//当Notification出现的时候便随着音乐和振动

//下面是自定义的一个notification
nf =new Notification(R.drawable.icon,"带进度条的提醒",System.currentTimeMillis()) ;   
nf.icon = R.drawable.icon;   
       
nf.contentView= new RemoteViews(this.getPackageName(),R.layout.notification);  //RemoteViews: 一个可以在其他应用进程中运行的类，是构造AppWidget的核心。目前，OPhone平台上的RemoteViews支持的布局(Layout)类暂时只有FrameLayout, LinearLayout和RelativeLayout，并且不支持自定义类
 
nf.contentView.setProgressBar(R.id.ProgressBar01, 100, 0, false);   
nf.contentIntent=PendingIntent.getActivity( this, 0, new Intent(this,remoteview.class) ,0);