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I have an app, which I also have in the Google Playstore. I built this app on an old machine at the time and signed it there as well. Since I need to update the app, I pulled the code from my repo to my new machine (different Android Studio version). Likewise, I had saved the key for the signature and copied it to my new machine. I can also build the app with the signature. However, when updating on the phone, it keeps crashing. Android Studio tells me the following when I do this:

The device already has an application with the same package but a different signature.

The key, as I said, is actually the same for the siganture How can I fix this? The app is used by multiple users through the playstore.

But I also need to have the possibility to update the app only via the APK (so not only from the store).

steffen
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  • Go to your play console, visit your app, then Setup -> App integrity, this page describes how Google Play App Signing works. In brief, the key you use is not the same as the Google Play Store use. – bbsimon Apr 09 '21 at 12:56
  • If I understand your answer correctly, I don't get the "problem" if I upload the APK in Google Play Console and update the app from there? I tested it in an "internal test" and get the same error :/ – steffen Apr 09 '21 at 14:17

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