3 things to know about Kotlin from Android Dev Summit 2019

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Posted by David Winer, Kotlin Product Manager, @davidjwiner

Last month’s #AndroidDevSummit was jam-packed with announcements and technical news...so much that we wouldn’t be surprised if you missed something. So all this month, we’ll be diving into key areas from throughout the summit so you don’t miss anything. First up, we’re spotlighting Kotlin, with the top things you should know:

#1: Kotlin momentum on Android

Kotlin is at the heart of modern Android development — and we’ve been excited to see how quickly it has won over developers around the world. At Android Dev Summit we announced that nearly 60% of the top 1000 Android apps on the Play Store now use Kotlin, and we’re seeing more developers adopt it every day. Kotlin has helpful features like null safety, data classes, coroutines, and complete interoperability with the Java programming language. We’re doubling down on Kotlin with more Kotlin-first APIs even beyond AndroidX — we just released KTX extensions, including coroutines support, for Play Core. There’s never been a better time to give Kotlin a try.

#2: Learn more: Getting started with Kotlin & diving into advanced Kotlin with coroutines

If you’re introducing Kotlin into an existing codebase, chances are that you’ll be calling the Java programming language from Kotlin and vice versa. At Android Dev Summit, developer advocates Murat Yener, Nicole Borrelli, and Wenbo Zhu took a look at how nullability, getters, setters, default parameters, exceptions, and more work across the two languages.

For those looking into more advanced Kotlin topics, we recommend watching Jose Alcérreca's and Yigit Boyar's talk that explains how coroutines and Flow can fit together with LiveData in your app's architecture and one on testing coroutines by Sean McQuillan and Manuel Vivo.

#3: Get certified in Kotlin

We announced the launch of our Associate Android Developer certification in Kotlin. Now you can prove your proficiency with modern Kotlin development on Android to your coworkers, your professional network, or even your future employer. As part of this launch, you can take this exam at a discount when using the code ADSCERT99 through January 25.

It’s especially great to hear from you, the Android community, at events like Android Dev Summit: what do you want to hear more about, and how can we help with something you’re working on. We asked you to submit your burning questions on Twitter and the livestream, and developer advocates Florina Muntenescu and Sean McQuillan answered your Kotlin and coroutines questions live during our #AskAndroid segment:

You can find the entire playlist of Android Dev Summit sessions and videos here. We’ll continue to spotlight other areas later this month, so keep an eye out and follow Android Developers on Twitter. Thanks so much for letting us be a part of this experience with you!

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