双缓冲技术，在symbian编程中极其重要。可以减少屏幕闪烁现象~

简单的Clock实现，有闹铃功能，到了点之后屏幕还会闪烁，很好看。-Simple Clock implementation, there are alarm function, to the point after the screen will flicker, very nice.

闪光灯屏幕背光SOS手电筒是一个安卓手电筒的应用源码，有屏幕背光、闪光灯、和屏幕SOS三种模式，屏幕背光就是调节屏幕亮度到最亮，闪光灯就是让闪光灯长亮，SOS就是屏幕一直红白闪烁。-Flash screen backlight SOS flashlight is a flashlight of Android application source code, three modes of screen backlight, flash, and screen SOS, backlit scree