以编程方式更改自适应亮度级别 [英] Change adaptive brightness level programmatically

问题描述

如何在Android Lollipop上以编程方式更改自适应亮度级别?

我知道如何更改手册brightness level，以及如何打开或关闭adaptive brightness.这样做是这样的: Settings.System.putInt(cr, Settings.System.SCREEN_BRIGHTNESS, newLevel);

但是，在启用adaptive brightness的情况下，操作系统将其与另一个brightness level组合，该brightness level与手动操作不同.

有没有办法做到这一点?

目标/最小/最大SDK为21.

解决方案

不知道为什么，但是Android API中有一个隐藏的常量SCREEN_AUTO_BRIGHTNESS_ADJ来调整自适应亮度.但是您可以像我一样通过"screen_auto_brightness_adj"字符串值.

自适应亮度调节以浮点值的形式存储在[-1; 1]范围内.如果您使用[0; 255]范围内的亮度值，则可以将其转换为合适的值，如下所示.

float value = (((float)brightness*2)/255) - 1.0f;
Settings.System.putFloat(contentResolver, "screen_auto_brightness_adj", value);

How can I change the adaptive brightness level programmatically, on Android Lollipop?

I know how to change the manual brightness level, and to toggle on or off the adaptive brightness. It is done like that: Settings.System.putInt(cr, Settings.System.SCREEN_BRIGHTNESS, newLevel);

However, with adaptive brightness is enabled, the OS combines it with another brightness level which is different than the manual one.

Is there a way to do this?

Target/min/max SDK is 21.

解决方案

Don't know why but there is a hidden constant SCREEN_AUTO_BRIGHTNESS_ADJ in Android API to adjust adaptive brightness. But you can pass "screen_auto_brightness_adj" string value instead like I did.

Adaptive brightness adjustment is stored as float value in range [-1;1]. If you use brightness value in range [0;255], you can convert it to proper value as shown below.

float value = (((float)brightness*2)/255) - 1.0f;
Settings.System.putFloat(contentResolver, "screen_auto_brightness_adj", value);

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