I got my Google Map API key and embedded it in my code. At this moment MAP was working. No issues at this point.
Then, I generated signed apk and released the app on playstore. On downloading the app - map was not working (not showing any visuals) in any device.
Then to get Map API for release version (as I came to know later),
I did this:
Now, when I run the app, Map fragment is not showing any visuals. It looks pretty much like this:
try this,
keytool -list -v -keystore "Your Keystore Path" -alias "Your alias name" -storepass "your keystore password" -keypass "your keystore password"