ISSUE #222

1st of November 2020

Hello Kotliners. We have received during this weekend a record amount of submissions, thanks for that community! Here is our selection of topics for the upcoming week.

Announcements

kotlinx.coroutines 1.4.0: Introducing StateFlow and SharedFlow
JetBrains has released the version 1.4.0 of the Kotlin Coroutines library. The highlights of the release are StateFlow and SharedFlow, which are being promoted to stable API. Read more about all the goodies included here.
blog.jetbrains.com

Articles

DTO Generator
The folks at Kotlin Academy have created a DTO generator. It was never so easy to generate your own model classes.
kt.academy

Multiplatform Testing Pattern inside Coroutine Lib
What is the testing pattern used inside the Kotlin Coroutine library? It’s a multiplatform library that uses a pattern that tests functionality for JS, JVM and native. In this article, Mohit Sarveiya explores how testing is performed and explore examples of unit tests in the library.
codingwithmohit.com

Android w/o DI
Article by Bob Dahlberg about actors, coroutines, flow, and Kotlin architecture in Android.
bob-dahlberg.medium.com

Kotlin Coroutines Exception Handling Cheat Sheet
Lukas Lechner has published a cheatsheet with all the information you need to handle exceptions in Kotlin.
www.lukaslechner.com

RxJava Combining Operators
In this tutorial, you’ll use RxJava combining operators to merge, filter and transform your data into succinct and reusable streams.
www.raywenderlich.com

Kotlin Multiplatform Codelab
Carlos Mota has written a KMP Codelab about a workshop he gave at Droidcon EMEA.
cmota.github.io

Exploring use of StateFlow in a Kotlin Multiplatform project
Kotlinx Coroutines recently introduced the StateFlow API, described as “A Flow that represents a read-only state with a single updatable data value that emits updates to the value to its collectors”. John O'Reilly explores it in this article.
johnoreilly.dev

Boolean not
The method not() is frequently wrongly understood in Kotlin. Vasya Drobushkov explores it in this article.
krossovochkin.github.io

Sponsored

Join the most interactive virtual AndroidDev Event
Experience 100+ tech talks on all things Android Development - Workshops - 1on1s with Dev Experts and more.
www.online.droidcon.com

Android

Fewer crashes and more stability with Kotlin
Kotlin can improve your app stability, as proven by some statistics in Google Play store. Florina Muntenescu describes in this post how to achieve it.
medium.com

Breaking down destructuring declarations
In this other article by Florina, you can learn how to use Kotlin’s destructuring declarations to break down one object that contains multiple fields to initialize several separate variables
medium.com

Using the Signature class to verify data
You can use the Signature class in Android to verify data and have a secure communication with your backend. See how we can achieve it in this article.
medium.com

Advanced Android with Kotlin
Check out this nice free course by Google about developing Android apps with Kotlin
www.udacity.com

Migrating the deprecated Kotlin Android Extensions compiler plugin
In Kotlin 1.4.20-M2 JetBrains deprecated Kotlin Android Extensions compiler plugin. Learn in this article how to migrate it.
proandroiddev.com

Create an App from scratch with Dropwizard, Maven, and Kotlin
Ron Paz has written an article about creating an App from scratch using Dropwizard, Maven, and Kotlin
levelup.gitconnected.com

Libraries

Kite
Kite adds AI powered code completions to your code editor, and it supports Kotlin.
www.kite.com

Firebase Kotlin SDK
The Firebase Kotlin SDK is a Kotlin-first SDK for Firebase. It's API is similar to the Firebase Android SDK Kotlin Extensions but also supports multiplatform projects, enabling you to use Firebase directly from your common source targeting iOS, Android or JS.
github.com

NotyKT
NotyKT is the complete Kotlin-stack note taking️ application built to demonstrate a use of Kotlin programming language in server-side and Modern Android development tools
github.com

Simple State Machines in Kotlin (KSSM)
KSSM provides an easy and simple DSL for setting up finite-state machines, and opens a clean API with built-in threading and conflation mechanisms for manipulating states.
github.com

Contribute

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If you want to submit an article for the next issue, please do also drop us an email.

Thanks to JetBrains for their support!

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