app-settings
There are 3 repositories under app-settings topic.
ErrorxCode/NxPreference
Save activity or fragment state persistently. With this library, you can make preference screen with normal activity and views.
moosolutions/settings-saver
This piece of software will would you help to migrate your app settings from one PC to another.
DevExpress-Examples/how-to-save-a-current-skin-name-and-restore-it-at-the-next-application-run-e2897
Save the name of the active skin and restore it the next time you rub the application.