Kotlin with Android - Create Apps easily and fun

This talk was presented in Google Campus São Paulo - https://bit.ly/2Nv9F32

In this presentation I talk about Kotlin language and show the diferences with Java.
Talk about the Kotlin book that I wrote - https://bit.ly/2QMLtHs

Transcript

1. Kotlin with Android Create Apps easily and fun
2. WRITTEN AND DIRECTED BY KASSIANO RESENDE This talk was ..
3. But, who is Kassiano ?? • Mobile Teacher at SENAI • Book Writer • Android Java/Kotlin Developer • http://github.com/kassiano • https://www.linkedin.com/in/kassian-resende/
4. Chapter one A language is born, its name is Kotlin
5. The Language • Created by JetBrains in some while 2011 • Kotlin is a JVM language • Its consise, safe and interoperable • Expressive and powerfull
6. Consise, how ? This is a JAVA code ...
7. Now, the same code written in Kotlin Are you kidding me man ?
8. Show me more .. A simple Java class ..
9. The same class in Kotlin You really can just write ONE line of code
10. What about interoperability • Kotlin has total interoperability with JAVA, which means that you can write a Java code in a Kotlin project and it will work without any problem. Thats amazing !! • Show a bit of code
11. Why interoperability is a good ideia in Android? • Because of the libs !! Isso foi uma sacada genial
12. Null Safe This JAVA code throws a Null Pointer Exception ... In Kotlin the same code doesnt even compile
13. Chapter two Its functional too
14. Object-oriented and functional Kotlin has both object-oriented and functional constructs. You can use it in both OO and FP styles, or mix elements of the two. With first-class support for features such as higher-order functions, function types and lambdas, Kotlin is a great choice if you’re doing or exploring functional programming.
15. Filter function We can apply a filter in a list using a lambda function Here we are filtering the list with the Odd numbers, so it will create a new list filtered.
16. Map function We can apply a map in a list using a lambda function In this case we are mapping the list squaring all elements, so it will create a new list.
17. Reduce function We can reduce a list to a single value using lambda too In this case we are reducing the list to one single value, which is the sum of all elements
18. Combine these functions We can combine these functions ! Here we have the sum of all odd elements squared !
19. Chapter three The book
20. Kotlin com Android beautiful, Isnt it?
21. Its quite diferent The book is quite diferent from the most technical books you see. The main diferente is that is not a Book deep into Android even its not a book deep into Kotlin.
22. This was made for you • I wrote every single of line thinking of you ! • Thinking in how you learn • Thinking in how the knowleadge is build into your head
23. Looking inside 1. A linguagem Kotlin 2. Programando em Kotlin 3. Configurando o ambiente de desenvolvimento 4. Anatomia da plataforma Android 5. Primeiro projeto – Calculadora de aposentadoria 6. Lista de compras 7. Lista de compras 2.0 8. Persistencia de dados com SQLite 9. Calculadora de Bitcoin 10.Notificações, permissões, localização e publicação
24. Special thanks Thanks to Primi to support this event Thaks All companys that area here today: SENAI, FATEC, Houpa, ITAU Unibanco, Pagar.Me, Donuts4u, RDI – Capgemini, Caelum / Alura, Loggi, Tivit Etc..