Well thanks @yokunjon for moderating but,
A tutorial should encourage users to find their way, shouldn't show or force them the way.
I really don't understand what you meant by that.
The tutorial is to show the users how to accomplish a certain task with best Android practices.
I thank you for the feedback. Briefly, what you've done is showing how you solve the problem. Actually, it's a basic engineering problem. In these situations, the real learning happens when the user solves it by himself. So, the content of your tutorial isn't a good example as a tutorial. You've already shown them how to create Realms databases, so let them find their own way and migrate their databases to another one when needed. Because, if you were to show the same thing for each database, it would be lots of content which repeats itself.
A real world example would be teaching how to step each step rather than generally walking.
If you need more detailed/further explanation, that is not problem, don't hesitate to ask. :)