前面关于Notification的介绍已经能完成大部分的功能，这篇主要记录一下，看到但是暂时还没用的上知识点和功能。
一、对于一个app，notification的区别是由id或者id与tag组成的一个对，作为唯一的notification标识。
* Each of the notify methods takes an int id parameter and optionally a * {@link String} tag parameter, which may be {@code null}. These parameters * are used to form a pair (tag, id), or ({@code null}, id) if tag is * unspecified. This pair identifies this notification from your app to the * system, so that pair should be unique within your app. If you call one * of the notify methods with a (tag, id) pair that is currently active and * a new set of notification parameters, it will be updated. For example, * if you pass a new status bar icon, the old icon in the status bar will * be replaced with the new one. This is also the same tag and id you pass * to the {@link #cancel(int)} or {@link #cancel(String, int)} method to clear * this notification.
从中，我们可以看到，对于新建，还是更新已有通知，Android并不是用方法去区分，而是用notification的id去区分的
二、对于新建与更新notification
在Notification类中，有一个内部类Builder，这个类能构帮我们构造通知。
eg:
NotificationManager notificationManager; Notification.Builder notificationBuilder; Notification notification; notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); notificationBuilder = new Notification.Builder(this); notificationBuilder.setVibrate(new long[]{100,200,100,200}); notificationBuilder.setContentTitle("hi~"); notification = notificationBuilder.build();
如上的代码即是利用 Notification.Builder创建了一个Notification，并设置了它的振动和Title;有了这个Notification之后，就可以轻松地：
notificationManager.notify(111 , notification);
其中111就是我随便敲的id。
notificationBuilder中还有很多属性可以设置，在此不一一列举（以后可能会加在附录）。
上面说的是新建。
如果我想修改notification的属性，再重发一次。网上有些博客写的方法是
notification.setLatestEventInfo(Context context, CharSequence contentTitle, CharSequence contentText, PendingIntent contentIntent);
我在Notification的代码中还能找到这个方法，但是这个方法已经被废弃了。
* If this is an activity, it must include the * {@link android.content.Intent#FLAG_ACTIVITY_NEW_TASK} flag, which requires * that you take care of task management as described in the * <a href="{@docRoot}guide/topics/fundamentals/tasks-and-back-stack.html">Tasks and Back * Stack</a> document. * * @deprecated Use {@link Builder} instead. * @removed */ @Deprecated public void setLatestEventInfo(Context context, CharSequence contentTitle, CharSequence contentText, PendingIntent contentIntent) { Notification.Builder builder = new Notification.Builder(context);
新的版本中，修改Notification依旧使用Builder类。build一个新的notification，只要id和tag一样，notify()出去的也只是更新当前的。
暂时这些，学到再加。。。
原文：http://www.cnblogs.com/fishbone-lsy/p/4987110.html