android的应用层中使用

在android的应用层中，涉及到很多应用框架，例如：Service框架，Activity管理机制，Broadcast机制，对话框框架，标题栏框架，状态栏框架，通知机制，ActionBar框架等等。

下面就来说说经常会使用到通知机制中的通知栏框架（Notificaiton），它适用于交互事件的通知。它是位于顶层可以展开的通知列表。它会时不时的提醒你什么软件该更新了，什么人发你微信消息了等。

（网上看了下，全面介绍的文章不多，所以就萌生了写这篇的念头，随便当作回顾笔记。下面我就通过官方文档、源代码、书上的一些资料汇总下这一块的知识，并通过一个通知栏的汇总DEMO让大家更好的了解这个类的使用，内容有点多，可以根据需求看目录学习）。

Notificaiton状态通知栏：

功能作用

1.显示接收到短消息、即使消息等信息 （如QQ、微信、新浪、短信）  
2.显示客户端的推送消息（如有新版本发布，广告，推荐新闻等） 
3.显示正在进行的事物（例如：后台运行的程序）（如音乐播放器、版本更新时候的下载进度等）

思维导图结构

思维导图的大体结构（按照各个节点延伸拓展学习）

Notificaiton -- service   -- BroadcastReceiver  -- Intent（flag、Action等属性应用） --  PendingIntent

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