In this chapter, we looked at reactive programming and how it can help us to handle asynchronous events. We also introduced the React and RxJava libraries that provide classes such as Mono, Flux, Single, and Observable, which follow reactive programming concepts. 

Reactive programming allows us to use different thread schedulers to process and transform events with multithreading. The Blocking and Non-Blocking section showed us how to work with thread schedulers. You also learned that reactive programming is based on the Observer pattern. 

Modern Android applications handle a lot of different asynchronous events, such as user interactions and push notifications. Learning about Reactive programming is important, because it can help us to better manage our resources through asynchronous processing, allowing us to build more complex applications that are capable of multitasking.

In the next chapter, you will learn how to create the Application class.