Kotlin Archives - Page 2 of 7

MVP for Android: how to organize the presentation layer

174 Comments / Blog, Development, Kotlin / By Antonio Leiva

[et_pb_section admin_label=”section”] [et_pb_row admin_label=”row”] [et_pb_column type=”4_4″][et_pb_text admin_label=”Text”]MVP (Model View Presenter) pattern is a derivative from the well known MVC (Model View Controller), and one of the most popular patterns to organize the presentation layer in Android Applications. This article was first published in April 2014, and been the most popular since then. So I’ve decided …

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Hacking Architecture Components by using Kotlin

22 Comments / Blog, Development, Kotlin / By Antonio Leiva

I’ve been using Architecture Components for a while, and I must admit I love them. The Android team has managed to find a way to let us forget about lifecycles and focus on what really matters. But not only that. Thanks to Architecture Components (which you can learn more about them here), not committing mistakes …

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Yo Dawg! I heard you like Kotlin (Talk at Devfest Baltics)

Blog, Kotlin / By Antonio Leiva

In November 2017, I had the chance (and luck!) of participating in a great event at Latvia: Devfest Baltics. It was awesome in many ways, but specially because of how the organizers treated us the speakers. I had never felt so warm (in such a cold country 😂) I even had the chance to do …

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Listeners with several functions in Kotlin. How to make them shine?

11 Comments / Blog, Development, Kotlin / By Antonio Leiva

One question I get often is how to simplify the interaction with listeners that have several functions on Kotlin. For listeners (or any interfaces) with a single function is simple: it automatically lets you replace it by a lambda. But that’s not the case for listeners with several functions. So in this article I want …

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Calling Kotlin from Java: start using Kotlin today (KAD 29)

4 Comments / Blog, Kotlin / By Antonio Leiva

One of the great wonders of Kotlin is that it’s fully integrated with Java. This means that although all your application code is written Java, you can create a class in Kotlin and use it from Java without any issues. Calling Kotlin from Java code can’t be easier. This potentially gives you two advantages: You …

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Kotlin DSL to write Gradle scripts on Android: Step by step walkthrough

14 Comments / Blog, Kotlin / By Antonio Leiva

There’s been quite some months already since Gradle announced that they were working on supporting Kotlin to write Gradle Scripts, by using a version of the language that has been recently revamped to Kotlin DSL. At the beginning things where quite complicated, but nowadays, with latest versions of Kotlin DSL (at the time of writing …

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Why Kotlin for Android online course is different from any other

6 Comments / Blog, Development, Kotlin / By Antonio Leiva

You may probably know that this days I’m publishing my first online course in English, Kotlin for Android Developers, based on all the knowledge I’ve gotten from writing my book and the live workshop I teach here in Spain. In the course, you will learn Kotlin from scratch applied to Android development, in a very …

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Kotlin Android Extensions: Say goodbye to findViewById (KAD 04)

43 Comments / Blog, Kotlin / By Antonio Leiva

Warning! Kotlin Android Extensions are deprecated, you should start using View Binding. If you’ve been developing Android Apps for some time, you’re probably already tired of working with findViewById in your day-to-day life to recover views. Or maybe you gave up and started using the famous Butterknife library. If that’s your case, then you’ll love Kotlin Android …

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12 reasons why you should start using Kotlin for Android today (KAD 30)

19 Comments / Blog, Kotlin / By Antonio Leiva

Even now that Kotlin is an officially supported language to write Android Apps, you may still feel that there are not enough reasons for a change. Java has proved to be working during all these years, so why should you change? Here are my reasons why I think that, far from being a risky bet, …

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Sealed classes in Kotlin: enums with super-powers (KAD 28)

12 Comments / Blog, Kotlin / By Antonio Leiva

Sealed classes in Kotlin are another new concept we didn’t have in Java, and open another new world of possibilities. A sealed class allows you to represent constrained hierarchies in which an object can only be of one of the given types. That is, we have a class with a specific number of subclasses. What …

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