[android-developers] How to: Free to Paid App and retain preference and db files?

Hi,

I have a Ads supported app and I am planning to release a paid version without Ads and extra features.

My questions are how do I release the app so my user can purchase and use with losing the preferences and db?

Can I package it with the same name and upload into Google Play as new app or how is it been normally done?

Cheers.

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