android 设立当前应用窗口的屏幕亮度

只针对当前应用窗口，不影响系统屏幕亮度的设置

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原文解释

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?This can be used to override the user's preferred brightness of
? the screen.? A value of less than 0, the default, means to use the
? preferred screen brightness.? 0 to 1 adjusts the brightness from
? dark to full bright.

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我Google 翻译的

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这可以被用来覆盖用户的首选亮度在屏幕上。值小于0时，默认情况下，意味着使用
首选的屏幕亮度。 0到1调整亮度暗到全亮。

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//背光的亮度的设置		WindowManager.LayoutParams lp = getWindow().getAttributes();		if(viewModel.getScreenMode()==Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC){			lp.screenBrightness = -1.0f;		}else{			lp.screenBrightness = viewModel.getScreenBrightness()/255f;		}		getWindow().setAttributes(lp);