How to use In-app FLEXIBLE anf IMMEDIATE update in the same Actitivty

I am trying to add in-app updates to my android application I want to add both FLEXIBLE and IMMEDIATE update to the app but the problem is I am not able to sort out where to put the registeruser code and other code

I am calling this function in onCreate of my activity.

        Task<AppUpdateInfo> appUpdateInfoTask = appUpdateManager.getAppUpdateInfo();
        appUpdateInfoTask.addOnSuccessListener(appUpdateInfo -> {
            if (appUpdateInfo.updateAvailability() == UpdateAvailability.UPDATE_AVAILABLE) {
                if (appUpdateInfo.isUpdateTypeAllowed(IMMEDIATE)) {
                    try {
                        appUpdateManager.startUpdateFlowForResult(appUpdateInfo, IMMEDIATE, this, MY_REQUEST_CODE);
                    } catch (IntentSender.SendIntentException e) {
                        e.printStackTrace();
                    }
                } else if (appUpdateInfo.isUpdateTypeAllowed(AppUpdateType.FLEXIBLE)) {
                    try {
                        appUpdateManager.startUpdateFlowForResult(appUpdateInfo, AppUpdateType.FLEXIBLE, this, MY_REQUEST_CODE);
                    } catch (IntentSender.SendIntentException e) {
                        e.printStackTrace();
                    }
                }
            }
        });
    }