I'm sumbitting an android app to Google Play and am following the process to sign my app. However the documentation on the android development site seems unclear about whether or not every app I submit through my Google Play developer account should be signed with the same key or not.
From the android developer site:
Android requires that all apps be digitally signed with a certificate before they can be installed. Android uses this certificate to identify the author of an app, and the certificate does not need to be signed by a certificate authority. Android apps often use self-signed certificates. The app developer holds the certificate's private key.
Open Play Console and go to the Play App Signing page (Release > Setup > App integrity). Scroll to the “App signing key certificate” section and copy the fingerprints (MD5, SHA-1, and SHA-256) of your app signing certificate.
Unfortunately, there is no way to actually move apps from one Google account to another. Even if you contact Google about it, they will not be able to help you. However, you can add the old account to your Android and install any of the apps on both accounts.
No the same app next version or its update should be signed with the same key. And if you want to upload new(different) app you have to generate new key and that key works for that app only and its updates.
Like i have uploaded two apps on the playstore proQuiz gilpix and wallpaper.
The keys for both are different and if i want to upload next version of any app, I have to use their respective keys.
The keys are ment to identify the original owner of the android application and allow them to update the older app on the playstore.
http://developer.android.com/tools/publishing/app-signing.html
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