So Kotlin needs to be extremely interoperable with Java code. They want to use it to continue developing their current projects written in Java without having to rewrite the whole code. That´s one of the main ideas the Kotlin team kept in mind while developing this new language. Highly interoperable: It works extremely well with any other Java libraries, and the interoperability is very simple.

Kotlin adds less than 7000 methods, more or less the same as support-v4. This is important because Android method limit is always a problem, and though there are some options to solve it such as proguard or multidexing, all of these solutions will add complexity and will be time consuming when debugging. Lightweight: Kotlin library is small compared to others.Kotlin is much more limited, but it´s easier to start if you´ve never used a modern language before. Relatively fast learning curve: compared to Scala for instance, we are moving in a much simpler scope.These are the reasons why I chose Kotlin as a study case: An awesome example of Android using Scala can be found in 47deg Github site. My first disclaimer is that I haven´t tried any other alternatives to Kotlin such as Go or Scala, so I recommend searching what other people thinks about those languages if you are really thinking on switching to another language. Kotlin was born with the idea of covering those gaps Java leaves and add much more simplicity to the code saving us from writing as much boilerplate code as possible.

It´s an object oriented language that includes many ideas from functional programming. Kotlin is a JVM based language created by JetBrains, the team behind IntelliJ, which is the base for Android Studio. That´s the interest behind the use of Kotlin and similar languages: being able to use modern programming techniques in our ancient environment. It seems that many of the things Java lacks are being covered in latest revision, but Android developers won´t be able to take advantage of them for many years. Java is one of the most used languages in the world, and while many other languages evolve to make programmers lives easier, Java has not been able to keep their track as fast as expected. Kotlin is one of the many JVM based languages that are starting to emerge as a possible Java successor in Android development.

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