Kotlin objects are another element of the language that we Android developers are not familiarized with, because there is nothing like that in Java. In fact, an object is just a data type with a single implementation. So if we want to find something similar in Java, that would be the Singleton pattern. We’ll compare …
Objects in Kotlin: Create safe singletons in one line of code (KAD 27) Read More »
The interfaces in Kotlin will allow you to reuse more code than what you can get with Java. The reason is very simple: you can add code to your interfaces. If you’ve tried Java 8, it’s something pretty similar. The good thing about being able to include code in an interface is that you can use …
Interfaces in Kotlin. Who said interfaces can’t have code? (KAD 26) Read More »
Truth to be told: writing databases in Android is quite boring. All the boilerplate required to work with SQLite is far from being the most delightful thing in the world. Fortunately, there are already enough libraries that simplify this task, one of them announced during the latest Google I/O, called Room. With Anko, however, we can continue to …
Databases on Android with Anko and Kotlin: SQLite never was so easy (KAD 25) Read More »
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What do 17 Google Developers Experts for Android think about Kotlin? Read More »
Creating alerts and dialogs on Android is a relatively simple task thanks to the builder, but due to the verbosity of the language it usually becomes something quite illegible. In Kotlin, by the mere fact of the lambdas, it simplifies us a little to understand what is happening in that code. But thanks to Anko, we …
Dialogs and alerts on Android using Anko and Kotlin (KAD 24) Read More »
One of the most common issues for Kotlin, as we talked about in a previous article, is that all classes and functions are closed by default. This means that if you want to mock a class (something that may be quite common in Java testing), you need to either open it with the reserved keyword …
How to mock final classes on Kotlin using Mockito 2 (KAD 23) Read More »
Of course, Kotlin also allows us to do unit tests in a very simple way, and very similar to what we’re used in Java. There are some small complications when we use libraries like Mockito, but we’ll see some tricks to make it easier. If all this passionate you as to me, I encourage you to …
This is just one more example about how in Kotlin we can continue to use the same libraries we’ve always used in Java for Android. Retrofit is a library that greatly simplifies doing requests to an API, and in this case I’m going to teach you how to integrate it with some LastFM API requests. You …
How to use Retrofit on android with Kotlin (KAD 21) Read More »
Virtually everyone who wants to create code on Android in a decoupled and easy-to-test way, resorts to Dagger sooner or later. Although there is something that works a bit differently when setting up Dagger in Kotlin, most of it is quite simple, and in a few steps I’m going to show you here today. Also be …
How to use Dagger 2 on Android with Kotlin (KAD 20) Read More »
It had taken me too long to write an article to one of the most important parts of Kotlin: the treatment of nullity. Tony Hoare, the creator of the idea of nulls, calls itself “the billion dollar mistake”. Nulls are one of the most error-prone points you get when you are coding with Java. If you want to start …
Say goodbye to NullPointerException. Working with nulls in Kotlin (KAD 19) Read More »