背景灯常量

打开
mWakeLock = ((PowerManager)mContext.getSystemService(Context.POWER_SERVICE))
			.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, "SystemSet");
mWakeLock.acquire();

关闭

if (null != mWakeLock && mWakeLock.isHeld()) {
	mWakeLock.release();
	mWakeLock = null;
}