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Someone gave me an android app signed with a debug certificate, I've published this app but I regret. Now I want to upgrade the app and add a release certificate as well as the ancient debug certificate.Is that possible? If possible, can I remove the debug certificate and keep only the release one in the next version?

Zijian
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That is not possible. You need to republish as a new App if you plan to sign with different certificate, As stated in

http://developer.android.com/tools/publishing/app-signing.html

If you publish an app to Google Play and then lose the key with which you signed your app, you will not be able to publish any updates to your app, since you must always sign all versions of your app with the same key.

Elye
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  • What's the sense of multi-certificates? If the app is signed with two certificates, we can only update the app using both the same certificates? – Zijian May 13 '16 at 18:27
  • You could multi sign your APK, but you can't publish it to googleplay. Refers to http://stackoverflow.com/a/2883981/3286489 – Elye May 13 '16 at 18:52