如何调暗屏幕为零而不FLAG_KEEP_SCREEN_ON发生冲突 [英] How to dim screen to zero without conflicting with FLAG_KEEP_SCREEN_ON
问题描述
我发现了几个方法来调暗屏幕，但我不确定他们在演唱会上如何与<一个href="http://stackoverflow.com/questions/2131948/force-screen-on/2134602#2134602">FLAG_KEEP_SCREEN_ON:
I found several methods to dim the screen but I am unsure how they work in concert with FLAG_KEEP_SCREEN_ON:
- <一个href="http://stackoverflow.com/questions/3496806/what-is-the-proper-way-to-dim-the-screen">Settings.System.SCREEN_BRIGHTNESS
- <一个href="http://stackoverflow.com/questions/3496806/what-is-the-proper-way-to-dim-the-screen">IHardwareService.setScreenBacklight()
- <一个href="http://stackoverflow.com/questions/3496806/what-is-the-proper-way-to-dim-the-screen/5287368#5287368">WindowManager.LayoutParams.screenBrightness
- Settings.System.SCREEN_BRIGHTNESS
- IHardwareService.setScreenBacklight()
- WindowManager.LayoutParams.screenBrightness
这上面的方法将保持在屏幕上，即使我将亮度设置为 0.0
Which of the above methods will keep the screen on, even if I set brightness to 0.0?
推荐答案
没有什么会可靠地工作。如果亮度设为0某些设备上，将关闭屏幕（但该设备将处于一个有趣的状态约5秒左右才真正意识到它的关闭，充当这样的）。一些设备将是上，但黑色
Nothing will work reliably. If you set the brightness to 0 on some devices it will turn off the screen (but the device will be in a funny state for about 5 seconds or so before really realizing it's off and acting as such). Some devices it will be on but black.
IIRC LayoutParams.screenBrightness其值小于30是不可靠的，因为它可能会关闭显示屏。
IIRC LayoutParams.screenBrightness with a value less than 30 is unreliable in that it might turn off the display.
在一个AMOLED器件的全屏幕的全黑将没有背光。但SLCD一定会的。同时在Android 3.0，你不能有一个全屏幕的系统栏始终可见。
On an AMOLED device a full screen that's all black will not have backlight. But SLCD definitely will. Also on Android 3.0 you can't have a full screen as the system bar is always visible.
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