If you allow WLocker to call for Home, it keeps WidgetLocker itself running with high priority in the system memory, making it popup instantly like a regular lock screen would.

如果你允许WLocker调用主屏幕，WidgetLocker会将自己在系统内存中设为高优先级，让它像正常的锁定屏幕一样立刻弹出。

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The popup is displayed only if the standby or the screen saver application is running in the foreground.

弹出才会显示待机或者屏幕保护程序是在前台运行。

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Figure 1. The sample application's main screen (left) and simple popup alert (right).

图1。示例应用的主界面(左)和一个简单的提示框体(右)。

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Earlier we mentioned that Popup Video is available on the Note II, but that isn't the only thing that pops up -- you can do the same thing with Popup Note, which is activated by holding the S Pen button and double-tapping on the screen.

ENGADGET: Samsung Galaxy Note II review Mobile

Thanks to the breadth of the GALAXY Note II's amazing viewing experience, a feature called Popup Note extends the concept of Popup Play, which lets users open an S Note instantly as a pop-up window anywhere on the screen.

ENGADGET: Samsung Galaxy Note II unveiled: 5.5-inch HD Super AMOLED display, Android Jelly Bean and more S Pen functionality