Lot of forms in a single app view, how to handle?

I need to put about 20 <input type="text"> in a single form in my ionic app and i can't use tabs view.
I also need to ask user to select some data in a dropdown list that load data from the back-end. The problem is that the user need to be able to scroll in that dropdown without losing focus.

What is the best way to handle this situation without tabs view and how can I show datas while the user is typing in the field?

Also can you provide me some examples of apps that are similar to my case (lot of fields in a single form)?

Note: the app is material design like so it has to be user friendly.

Thank you very much!

EDIT : I was thinking about using some modal views and split the form in 3 or 4 section. Is this duable and user friendly?