Stepan Goncharov

Fortunately for me Kotlin it is a Swiss Army Knife in Java world, and you are right, it’s not free, same as RetroLambda Kotlin come with its price. I do not recommend to use RetroLambda because of the price it’s too high. 
What you’ll get for your project with RetroLambda? You’ll write less code in your project! That’s it. But truth is — Android…

Hi! Glad you asked!

1. Here is no contradiction. IMHO in many cases it’s better to wrap observable in class that would contain additional data and logic. It’s good for two reasons. If logic will change you’ll change it in one place and it would be easier to replace rxJava in future 😊

First of all realm is big and complex library that will increase size of your app dramatically(1mb+ is huge in mobile world), you should have I really good reason to consider using it instead of SQLite.

Also don’t forget about methods limit and compilation time.