Android 6.0 修改屏幕默认亮度

frameworks/base/packages/SettingsProvider/res/values/defaults.xml

     <!-- Default screen brightness, from 0 to 255.  102 is 40%. -->
--    <integer name="def_screen_brightness">170</integer>
++    <integer name="def_screen_brightness">100</integer>
     <bool name="def_screen_brightness_automatic_mode">false</bool>