Notifications are a key part of the Android user experience because they let applications show key updates and status information to users in real time.
通知机制是Android系统用户体验的一个核心部分，因为它可以实时地通知用户关键更新和状态信息。
Android home screen includes a status bar which shows the time, signal strength and other notifications.
Android的主界面上有一个状态栏，可以显示时间、信号强度和其他通知。
Android home screen includes a status bar which shows the time, signal strength and other notifications.
Android的主界面上有一个状态栏，可以显示时间、信号强度和其他通知。
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