I use a Google Analytics in my android application, a few days before today I receive an email that means In Oct. 2019 Google will sunset Google Analytics for mobile apps reporting and the Google Analytics Services SDK.
So I decided to migrate to Firebase Analytics. I am a little bit disgusted because Firebase Analytics doesn't have a feature called 'Behaviour Flow'.
I want to track user behaviour / flow, how can I achieve this with Firebase Analytics?
You can't do exactly the same thing as you did in GA. There is no "behavior flow" that you can turn on or track. Even the "screen views" have turned into just event based.
I think the closest thing out of the box would be using funnels, identifying the funnels that you care about and track those.
Alternatively, you can connect the firebase data to bigquery, export and analyse the data that way, but you probably would need to do a lot of processing.