Handle token expiry in AuthenticationChallengeHandler

[KrithikaLakshmi]

When authenticating using Oauth in Android using arcgis maps sdk (kotlin) , we have defined the authenticationchallegehandler to handle oauthcredential challenge like below. 

ArcGISAuthenticationChallengeHandler { challenge: ArcGISAuthenticationChallenge ->
    val oAuthConfiguration = getOAuthConfiguration()
    if (oAuthConfiguration != null && oAuthConfiguration.canBeUsedForUrl(challenge.requestUrl)) {
         val oAuthUserCredential =
                OAuthUserCredential.create(oAuthConfiguration) { oAuthUserSignIn ->
                    loginViewModel?.promptForOAuthUserSignIn(oAuthUserSignIn)
                }.getOrThrow()

            ArcGISEnvironment.authenticationManager.arcGISCredentialStore.add(
                oAuthUserCredential
            )
            ArcGISAuthenticationChallengeResponse.ContinueWithCredential(
                oAuthUserCredential
            )
        }
    }

In this case, the user is shown the prompt to signin , in case the user is in the LoginActivity. How do we handle token expiry incase we are in a different activity ? How will we get the token expiry message? Any sample would be much appreciated.