How can a PreferenceActivity use a custom preference file

Question

My first attempt at preferences was without knowledge of PreferenceActivity. So now I have an app that stores all user preferences in a specific preference file.

Answer 1

Maaalte is correct, what you want to do is onCreate test for the existence of your custom file and if it's there, rename it to standard shared preferences filename.

Another option is to read your old prefs one-by-one and use the shared preferences API to add them as you read them and then delete your old prefs when you are done.