Best practice for updating arguments of a fragment?

You can’t change arguments once its set and Fragment is added to Activity, I used a similar approach you defined yourself.

First, I checked the Bundle passed to onCreate(), if its not null I use it, but if its null then I use arguments. And I save whatever is the newest data in onSaveInstanceState().

For more details: Is it possible to pass arguments to a fragment after it’s been added to an activity?