<string-array name="themeKeys" translatable="false">
<item>themeLight</item>
<item>themeDefault</item>
+ <item>themeSystem</item>
</string-array>
<string-array name="themes">
<item>Light theme</item>
<item>Dark theme (default)</item>
+ <item>System theme</item>
</string-array>
</resources>