通过Service下载文件，然后想写个notification提示下载完成。。。哪位高手给出示例代码啊！！！！
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registerNotificationManager = (NotificationManager)IMConnectionService.this.getSystemService(NOTIFICATION_SERVICE);
registerNotification = new Notification ();
registerNotification.tickerText = "提示标题";
registerNotification.icon = R.drawable.main_logo;
registerNotification.when = System.currentTimeMillis();
PendingIntent pt = PendingIntent.getActivity(Service实例, 0, null, 0);
registerNotification.setLatestEventInfo(Service实例, "提示内容", "提示标题", pt);
registerNotificationManager.notify(REGISTER_ID, registerNotification);
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类名.this