CredentialExampleViewModel.kt

fun signInOrSignUpWithEnteredCredential(activity: Activity, username: String, password: String) {
    viewModelScope.launch {
        val signInSuccess = true
        //do some sign in or sign up logic here
        // signInSuccess = doSomeSignInOrSignUpWork(username, password)

        //then if successful...
        if (signInSuccess) {
            //Set signedInPasswordCredential - this is a flag to indicate to the UI that we're now
            //signed in.
            signedInPasswordCredential.value = PasswordCredential(username, password)

            //...And offer to the user to save the credential to the store.
            saveCredential(activity, username, password)
        }
    }
}