//RemoteViews是Notification的内部布局
RemoteViews rv = new RemoteViews(getPackdgeName(),R.layout.rv);
rv.setTextViewText = "正在下载";
rv.setImageResource(R.id.img,R.drawable.img);//设置Notification的图片
rv.setProgressBare(R.id.notiProgressbar, 100, 0, false);
Notification notification = new Notification（）；//过时版本的写法
notification.tickerText = "开始下载";
notification.icon = R.drawable.ic_laucher; //必须加上此处，否则后面的RemoteViews不起作用
notification.flag = Notification.FLAG_AUTO_CANCEL;  //点击完后自动清除
PendingIntent pendingIntent = PendingIntent.getAcitivity(this,0,new Intent(this,MainActivity.class),0);
notification.contentView = rv;
notification.contentIntent=pendingIntent;  //点击Notification跳转
NotificationManager nm = (NotificationManager)getSystemService(NOTIFIACTION_SERVICE);
//自定义显示状态时
noti.setLatestEventInfo(this,contentTitle,contentText,0);
nm.noti(notificationId,noti);

//新版本的写法
Notification notification = new Notification.Builder(this).setContentIntent(pendingIntent).setContentTitle("下载完成").setContentText("微笑通").setSmallIcon(R.drawable.img);//同样此处icon必须设置否则RemoteViews不起作用
notification.contentIntent = rv; //自定义显示的状态
nm.noti(notificationId,noti);

Notification的简单使用