Android修改默认屏幕亮度

本文基于Android5.1

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1、修改默认屏幕亮度：\frameworks\base\packages\SettingsProvider\res\values\defaults.xml

<!-- Default screen brightness, from 0 to 255.  102 is 40%. -->
<integer name="def_screen_brightness">204</integer>

如上def_screen_brightness值，而系统屏幕最大亮度值为255，如果要修改默认为80%；因此255 * 80%=20.4，

2、修改默认屏幕亮度最大值和最小值：\frameworks\base\core\res\res\values\config.xml

<!-- Minimum screen brightness setting allowed by the power manager.
     The user is forbidden from setting the brightness below this level. -->
<integer name="config_screenBrightnessSettingMinimum">10</integer>

<!-- Maximum screen brightness allowed by the power manager.
     The user is forbidden from setting the brightness above this level. -->
<integer name="config_screenBrightnessSettingMaximum">204</integer>

如上这里指的系统默认亮度最大值为255，最小值为10，在此将可修改