Although broadcast receivers don't display a user interface, they may create a status bar notification to alert the user when a broadcast event occurs.

尽管broadcast receivers并不显示用户界面，它们可能创建一个状态栏通知来告知用户广播何时发生。

youdao

You could implement this notification using a floating DIV section display during activity, or using a simple message on the browser's status bar (although this is considered bad form by some).

您可以在活动过程中使用浮点DIV部分显示或使用浏览器状态栏上的简单消息实现此通知(不过，有些人认为这不是好的形式)。

youdao

A semi transparent notification bar (see screenshot below), slides down from the top of the screen when you update your status via the Web.

当用户通过网页更新Twitter状态时，会从网页上方滑出一个半透明的通知栏。

youdao

To be frank, my favorite notification method implemented on any mobile OS is the status bar on Android, mainly because it's easily accessible and navigable the vast majority of the time (it gets hidden in certain apps).

ENGADGET: Back to BlackBerry: closing time Mobile