I think I found a typo on Android Developer Documentation Page.
This is the normal documentation I think:
Sorry for the links, I can't upload a picture since I'm newcomer to this site.
The documentation says
a CellSignalStrengthNr instance. This value will never be null.
but the return type is:
CellSignalStrength
Am I asking a question for sure thing? Or the Documentation Page is wrong?
The correct link to the docs is https://developer.android.com/reference/android/telephony/CellInfoNr
The way to get docs corrected is to report the error to the author, not by posting a question on StackOverflow.
The link for doc errors is https://issuetracker.google.com/issues/new?component=192697