posted 5 years ago
Hello Carlos,
Thanks for your question. You don't need to! One of the great things about the JVM eco-system is what really matters are the byte codes that are generated, not the language that they were compiled.
However, there are many reasons why you might choose to learn Kotlin. We have both been Java developers for years, and Kotlin certainly has a much lighter feel to the syntax. Basically, there's a lot less boilerplate. Plus it has fancier type handling and improved generics (really quite advanced things like contravariancy of generic types). And we suspect you will really love coroutines. They are still very new (they were finalised just as we were finishing the book) but they give you more lightweight way of dealing with the kind of coding situations that would have previously required threads. And, there is the *huge* benefit that you compiled your code down into other formats, like JavaScript and native libraries.
D+D
Head First Android Development
https://dogriffiths.github.io/HeadFirstAndroid/#/