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After releasing an app that uses Google Sign In of Firebase


Overview


When authenticating an account in a smartphone app, I think that you often use Google Sign In of firebase. However, if you release an app that uses Google Sign In, you have to do somethig.



Add the official SHA-1 fingerprint


When the app is released on Google Play, the official fingerprint of the app will be published. Add this to your firebase project. Users will not be able to sign in unless you add it.


Since it is different from SHA-1 when it is released built with Android Studio, it will be a situation that "Users were not able to log in when I released it, even though it worked properly in the release build".



Location in Google Play Console


You can see the SHA-1 fingerprint in "Settings"-> "App integrity" on the left side of the page. Copy it.




Add it to Firebase project


Open the Firebase console screen and click the gear button next to "Project Overview" → "Set Project". Click "Add Fingerprint" at the bottom of the page that appears to add the SHA-1 fingerprint you just copied.




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