1. 修改android系统显示亮度的最大最小限制
修改 frameworks\base\core\res\res\values\config.xml （很多默认配置都是在这个文件里修改的）以下代码
<!-- Minimum screen brightness setting allowed by the power manager.
The user is forbidden from setting the brightness below this level. -->
<integer name="config_screenBrightnessSettingMinimum">110</integer>
<!-- Maximum screen brightness allowed by the power manager.
The user is forbidden from setting the brightness above this level. -->
<integer name="config_screenBrightnessSettingMaximum">255</integer>
<!-- Default screen brightness setting.
Must be in the range specified by minimum and maximum. -->
<integer name="config_screenBrightnessSettingDefault">220</integer>
<!-- Screen brightness used to dim the screen when the user activity
timeout expires. May be less than the minimum allowed brightness setting
that can be set by the user. -->
<integer name="config_screenBrightnessDim">110</integer>
2. 修改默认显示亮度
全志的是在这个文件： device\softwinner\wing-clover\overlay\frameworks\base\packages\SettingsProvider\res\values\defaults.xml
大部分开发板的在这个文件：frameworks\base\packages\SettingsProvider\res\values\defaults.xml <integer name="def_screen_brightness">250</integer><!--102-->
改完重新编译就ok了
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