<How to get user email and check if user already s...

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How to get user email and check if user already signed in using Credential Manager for Google SignIn
I have successfully integrated CredentialManager on Android. Suppose the user sign in for first time , I get the required details like email. Now the user completely closes the app and once he reopens again how to check if the user has already signed in using credential manager as well as get the email id of the signed in user, please note that the user has not logged out and has only closed the app completely from background. Here is my code
class MainActivity : AppCompatActivity() {...