CredentialExampleViewModel.kt

private suspend fun getCredential(activity: Activity): PasswordCredential? {
    try {
        //Tell the credential library that we're only interested in password credentials
        val getCredRequest = GetCredentialRequest(
            listOf(GetPasswordOption())
        )

        //Show the user a dialog allowing them to pick a saved credential
        val credentialResponse = credentialManager.getCredential(
            request = getCredRequest,
            activity = activity,
        )

        //Return the selected credential (as long as it's a username/password)
        return credentialResponse.credential as? PasswordCredential
    }
    catch (e: GetCredentialCancellationException) {
        //User cancelled the request. Return nothing
        return null
    }
    catch (e: NoCredentialException) {
        //We don't have a matching credential
        return null
    }
    catch (e: GetCredentialException) {
        Log.e("CredentialTest", "Error getting credential", e)
        throw e
    }
}