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Notification 对象必须包含以下内容:
Notification介绍 Notification通知,是一种让你的应用程序在不使用Activity的情况下警示用户方式。 它是看不见的程序组件 (Broadcast Receiver,Service和不活跃的Activity)警示用户有需要注意的事件发生的最好途径。 Notification 是由NotificationManager (系统服务)统一管理的。
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