Let's learn about Kotlin via these 171 free blog posts. They are ordered by HackerNoon reader engagement data. Visit the Learn Repo or LearnRepo.com to find the most read blog posts about any technology.

"Kotlin is a modern, cross-platform, multi-purpose programming language." - Kotlin official press kit

Programming has been one of the most in-demand and highly-paid skills for the last two decades, and the demand is only increasing. In addition to this demand and popularity in the market, working as a developer also provides a lot of flexibility. You can work from wherever you want and contribute to projects all around the world. All of these reasons make software development highly compatible with the freelancing lifestyle.

When it comes to the project and its realization, you should take into consideration lots of aspects. And the choice of the technology stack is one of the crucial things that can define how successful and smooth your project will be. Depending on the idea and requirements of your application, site or product, you may find and select a proper programming language (PL).

Please welcome our weekly sponsor Pusher to Hacker Noon! Pusher makes realtime APIs that enable developers all around the world to quickly add communication and collaboration features to their apps. Their core product enables developers to easily create features like in-app notifications, activity streams, real-time dashboards, live trackers and much more.

Technology has made our lives easier with several forms of implementation that are seen in different professional fields. As most individuals began to efficiently program computers, programming
languages with powerful tendencies and functionalities were born.

Cut Kotlin boilerplate with Suspendify. Learn how compiler plugins transform async code, boost IDE support, and simplify your workflow.

Deep dive into Kotlin compiler plugins: from FIR to IR, learn how Suspendify eliminates coroutine boilerplate and integrates seamlessly with IDEs.

Onvif (stands for: Open Network Video Interface Forum) is a non-profit with the goal of facilitating the development and use of a global open standard for the interface of physical IP-based security products — Wikipedia

Those days have long passed when cross-platform mobile applications used to have a single avenue—React Native. Things have changed very fast as people looked for new ways to gain more and more users in the mobile app domain.

6 efficient ways to run Kotlin code in Android Studio for faster testing and development.

According to the latest Octoverse report by Github, Kotlin has seen 2.6x growth in contributions as of September 2018 and is already becoming the go-to programming language for Android development. Understand what has made it inevitable.

and Why You Should Too!

Comparing Android UI: Dive into Jetpack Compose vs. XML, exploring modern declarative design for efficient app development.

Step by step reducing boilerplate required to make assisted factories work in a multi-module android project.

Marvel kotlin sample application using android components architecture in a modular project

Extension functions allow you to natively implement the "decorator" pattern. There are best practices for using them.

It’s been around 6 months since we adopted Kotlin for our backend services at the company I currently work at. We’ve been migrating an existing java spring boot service to Kotlin.

At the beginning of the year, when I started building Archbee, I evaluated some cool tech out there. Here’s the list of tech I think will change the world in ways we can’t even predict.

The most common Kotlin libraries that are used for cross-platform and Android development, testing, and documentation are considered in the article.

When you think about Android development, chances are one programming language immediately springs to mind and that is Java.

Type-safe domain modeling in Kotlin. If it compiles, it works. With Valiktor and Konad

An introduction to Kotlin coroutines compared to Futures/Promises such as Reactor’s Mono or Java’s CompletableFuture

Today we’re gonna learn how to show a full screen activity instead of a notification when the device is locked.

Have you decided to make your Android app multilingual? I guess that even if you haven't yet, you know about strings.xml and values-XX folders. Localizing your app should be easier than handling XML files. And it can be!

Learn how to embed a simple SHA-256 implementation on C-language in KMM library and use it for iOS andAndroid target platforms.

At the moment, the TIOBE index monitors 265 popular programming languages. The TIOBE includes a language on the list if it matches three key requirements: it is Turing complete, has its own Wikipedia page, and provides more than 5,000 search results on Google.

Jetpack Compose TextField max length works internally. The difference lies in how TextField state changes are applied.

A journey from a web developer to a drone maker, with all of the problems and solutions that come with making a drone using a Raspberry Pi and ESP32.

So , I recently completed a course on Coursera named “Kotlin for Java Developers” and therefore I feel I am the right person for one of the most hot trending question “Kotlin or Java”.

How to create your custom annotation for request routing for Spring Boot? Custom BeanPostProcessor helps to parse and register target methods.

The technology world is an ever-growing and expanding one, which today has many segments of its own. From that, app development is a highly evolving one. Dart Vs. Kotlin is the prime example of this.

Most modern mobile apps carry out asynchronous operations, operations that would require the user to wait while the app is busy. Creating nice interactive loaders that match the purpose of your app will greatly improve the user experience in your app. For example the gif above showcases an example where i used an animation of a washing machine as a loading animation in a laundromat Android application. The process of creating animations on android application as been greatly simplified by the guys at Lottie: https://lottiefiles.com/. In this little article, i would outline the steps required to utilize these animations to make awesome loaders for Android.

Kotlin, Scala, and Groovy are three of the best programming languages Java developers can learn in 2021 to enhance their profile to become an all-round dev

Discover how a developer transformed monorepo boilerplate frustration into a custom WebStorm plugin.

Jetpack Compose memory leaks are usually reference leaks. Learn the top leak patterns, why they happen, and how to fix them.

This article describes how to develop Domain-specific language in Kotlin. The business process description language is considered as an example.

There is ForwardingServerCallListener that gives calls to the next listener in the chain. We will extend this class and override the method onMessage.

How to easily deploy on Gradle for your Linux server without needing an entire development pipeline that the process normally requires you to have on hand.

SimpleMVI is a lightweight Kotlin library that makes building clean, testable, and domain-driven apps easy—perfect for developers using DDD and MVI patterns.

If you are a Java programmer and are thinking of learning some more programming languages to expand your knowledge and skills, but not sure which programming languages to choose, then you have come to the right place.

Our implementation will be straightforward; we will store requests and responses in Queues, and then put this data to MDC.

I chose Spring Cloud for the architecture of my Kotlin pet project and it was right. What conclusions have I drawn?

Visitor pattern is dead. Long live to Visitor pattern. (With Kotlin examples)

Sometimes we need to close some thread, and we can't just kill the thread as we need to free resources and close connections.

The New Technology Dilemma

How can we use data stream and what does that mean? Does Kotlin really offers an alternative?

This article describes several solutions and approaches to the "Bulb Switcher" problem.

I have talked to many Android developers, and most of them are excited about Kotlin. So am I. When I just started learning Kotlin, I was solving Kotlin Koans, and along with other great features, I was impressed with the power of functions for performing operations on collections. Since then, I spent three years writing Kotlin code but rarely utilised all the potential of the language.

Coroutines are lightweight threads providing better use of apps they are operating on.

Today I am going to talk about how to design Pure Function and help you understand the benefits of pure function.

A version catalog is a replacement for the previous patterns, supported by Gradle, without the drawbacks of the previous approaches.

With Android 9 (API level 28), Google officially started supporting what’s famously known as the notch, a cutout display at the top (because the last two years were the years of the notch?). I can’t claim that but with the notch support, most of the brands came out with their version of a cutout display and with that, we as developers need to think about yet another edge case, especially if we’re working with a completely immersive experience.

Understanding the shared steps in the project setup is crucial before delving into the specifics of each client-augmenting technology.

In this article, we will analyze the interesting points of the Fragment API, I think that it will be of interest to all developers who develop an application.

Logging is a crucial yet frequently underestimated component of application development. Proper logging practices can enhance the visibility of your application

I am putting my understanding about functor,Applicative and Monad after spending few days to find out what monad is . Here is what I found. I am using Kotlin to explain with examples

A practical example of the gains and pitfalls in migrating existing Sprint Boot logic to Vert.x with considerations to the experience and process involved.

For a tech newbie striving to learn programming, it might be a bit complicated to figure out which technology to choose. Let me help you out.

Learn why React Native projects break under pnpm’s default linking, and why switching to node-linker=hoisted is the simplest, most reliable fix in monorepos.

Feel free to contribute on GitHub 💚

This article is based on a story of one of our developers, ex Java now Scala developer, who decided to follow the Scala path because he found writing in Scala extremely developing and interesting.

Really sorry for the cheesy title. No Game of Thrones jokes below. Promise.

NeuralBridge is an open-source Android app that gives AI agents sub-10ms device control — 100x faster than conventional tools. No root. No middleware.

ImagePickerKMP is an open-source cross-platform library for capturing and selecting images on Android, iOS, and Kotlin Multiplatform with Compose.

Disclosure: Sam is Engineering Manager at Touchlab, a mobile innovation consultancy based in NYC with expertise in Kotlin Multiplatform.

Despite the fact that within the framework of the whole project, they seem microscopic. Try to optimize the launch of your application by autocomplete fields.

Kotlin vs java. Which one to choose for your next app? Read this blog to find out the similarities and differences between these two and which one to choose.

This post is about preorder traversal of a binary tree, a method of traversing the tree in which the current node is visited before its children.

If you are working on any technology and want to know which programming language is best for you then you can follow this article.

When we develop our applications we mostly have the best internet connections and we tend to not think about the number of requests the app will make to out back end server once it is live in production.

What are circuit-breakers? The stop a circuit when something wrong is happening right? But how can we control that?

This comprehensive guide demystifies effective logging and monitoring practices for monolithic applications developed by multiple teams

In this article, I want to show by example how ChatGPT can help a developer right now. We will make an application and then improve it.

How to use Shared Element Transitions in Jetpack Compose

In this story I am explaining where and where not to use the GlobalScope in Kotlin for Kotlin Coroutines of the kotlinx library.

This is our final post in our three-part series demonstrating using the Salesforce Mobile SDK to build an Android app that works with the Salesforce platform.

This problem asks us to find the maximum amount of water that can be stored in a container formed by two lines, on a 2-dimensional plane and the x-axis.

In this story I explain how concurrency works in Kotlin coroutines with an example to prove how it works. Concurrency in coroutines is cooperative.

In this article you will build a simple AR demo by writing a few lines of code.

Hi! This is a small interview about my path in tech and some advice to beginners.

A better localization system for Kotlin Multiplatform projects that allows you to automate translations, reduce boilerplate code, and enable real-time updates.

Dependency Injection (DI) is a technique where the responsibility of creating objects is transferred to other parts of the code.

Monitoring applications can easier said than done. What if I told you that it can be easier and it can be done? Let's try Grafana and Prometheus!

Working with Localstack can help us understand AWS a bit more because we can run an environment that acts in a similar way to AWS Cloud Services.

Delve into Kotlin delegates, understanding their implementation in Android app development for efficient and reusable code.

This feature helps you to group your regular expressions with name and reference to those groups later in the regex

In the last 10 years, more and more languages that run on the JVM have been developed but they look and feel nothing like Java. One such language is Kotlin.

How to create a dialogue with Lottie animation and a lot of customization in your Android App

https://en.wikipedia.org/wiki/HTC_Dream

When you upload your Android app on GitHub, you need to hide it as no one has access to it except you. It is considered a security glitch, so that’s why it ...

A couple of years ago, Reactive Programming was all the rage, but it had one big issue: reactive stopped as soon as you accessed a SQL database.

Can WebFlux be better than the tradition MVC? Why and why not? This is your test to clear that up!

New ideas about how to use the Android CodeView library easily to do implement features that can be used in any app not just Code Editor's or IDE's

Let's compare the different zero-code OpenTelemetry approaches on the JVM, covering the most widespread.

Ever wondered how to create a JWT token and what does that actually mean? How about using it in something relatively unknown? Let's see that with KumuluzEE!

A deep dive into building FogAI, ditching Python for JNI and C++ to run Qwen3-VL on OrangePi 4 with 60x lower latency for industrial edge AI.

Choosing the right app development company is critical to your project's success. Here are 7 mistakes you should avoid while hiring a development partner.

I want to compare the power of pattern matching across a couple of programming languages I'm familiar with in this post.

An architecture for Dagger that scales well to large codebases. Provided as a series of simple rules that humans and agents can follow (with examples).

Using automated tests to optimize your web application using Selenium, JUnit5, and Gauge Framework.

Discover Kotlin delegates and delegated properties in this guide. Learn how delegation simplifies code, enhances flexibility, and improves resource management.

In one project, we got an application that contained half of the source code in Java, and the other half in Kotlin. In fact, I asked a question: "Why is it so?"

This post is about providing a solution in Kotlin for finding all valid IP addresses that can be formed by inserting dots into a given string of digits.

Compare the OpenTelemetry Java Agent v1 and v2 with Micrometer Tracing in a Spring Boot application.

Rotate Expiring Spring Cloud Vault Database Credentials Without Downtime

Kotlin has many amazing features but one that stands out is extensions. Extensions are used to add functionality to existing classes.

Analyze the evolution of presentation patterns such as MVC (Model View Controller), MVP (Model View Presenter), MVVM (Model View View Model), and MVI.

In this post, I migrated my ad hoc test code to rely on OpenRewrite's provided classes.

Robolectric has an ambiguous reputation in the Android community due to difficulties of compatibility with other libraries.

How to compose independently computed Kotlin nullables, in an easy and clean way

Usually, I use Google Sheets to keep track of my income/expenses so I decided to build an app, using Compose, that would do the same.

Using Kotlin at your technical interviews!

FogAI is a distributed inference platform that actually survives when the internet goes dark.

Functional interface in kotlin and how to declare and use them in kotlin and java too

How and why I started automating my GitHub profile with Python over Kotlin.

This is the first article, in a new series where I’ll be sharing my journey of building an app for learning a language with Jetpack Compose.

This is to find out what Dispatchers.Unconfined actually do.

For the past couple of months I've been working on a data management tool I'm calling OpenDMP. As I've started adding more features, I've run into a scalability issue a bit sooner than I had expected and so I decided to tackle what is hopefully the biggest remaining piece of the project's system architecture.

What is an API Gateway and how can we use it? Kong offers that and in open-source form as well. Find out how the OSS version works!

Have a great idea for your mobile app development? Then it's the right time to bring into action by searching for the right technology for your app development. And when it comes to mobile and web app development, then most of the businesses look forward to choosing the most affordable and effective option for their project development.

What we learned fixing page load latency at DoorDash - and why most performance advice falls short at scale

The guide to start using coroutines for asynchronous programming to prevent blocking threads and efficiently utilize CPU resources.

The Strategy pattern is a behavioral design pattern that enables selecting an algorithm’s behavior at runtime

How to ensure that expiring Spring Cloud Vault dynamic database secrets are renewed, when reaching Hashicorp Vault’s max_ttl

LetterLens is a Kotlin-based OCR Android app that scans UK letters(NHS, Council) and can summarize them into clear What/When/Next steps with privacy first.

With this article, I want to complement my presentation by explaining in detail the different examples I showed in the slides

MVVM is also known as model-view-binder and was created by Microsoft architects Ken Cooper and John Gossman.

Explore the Model-View-Intent (MVI) architectural pattern, a vital component of the Unidirectional Data Flow approach in Android development.

Hi I am Amr Hesham a Software Engineer, I am interested in Android Development and Compiler Design 😎

In this article, we learned about the 4 building blocks of coroutines: suspend, CoroutineCoxtext, CoroutineScope and CoroutineDispatcher.

Standard schema validation allows delegating the validation to a third-party library and being done with it. Without one, we must fall back to manual validation

In this post, I'd like to introduce Vaadin in the context of AJAX and SSR.

Interview with Chen Fishbein, co-founder and CTO of Codename One about startup life, cross platform mobile development and the origins of the company

The main goal is to make TreeView easy to use, customize and extend almost without limitation and to be up to date with the new android versions.

Refining my OpenTelemetry demo with Apache APISIX, Kotlin, Spring Boot, Python, Flask, Rust, and more.

12/12/2023: Top 5 stories on the HackerNoon homepage!

When we are developing an android application it is common to come across a situation where we want to show an image somewhere in the app.The easiest way to handle this is to bundle the image along with the app but the downside to it would be increasing the size of the app. It is not feasible if the application needs to display a lot of high resolution images.So, the next best thing is to host the image in some server and download it from there when the app starts. This is where image caching plays a very important role. We download the image once and store it in our cache and reuse it whenever required. This post will show how we can do that using just one annotation using the ColdStorage library.

Is there a reason to keep using legacy services? Probably not! But this is one way to do it and bring it to Reactive!

[142. MAKE CONVERSATIONAL AI WORK

at JUNCTION 2020 HACKATHON](https://hackernoon.com/make-conversational-ai-work-at-junction-2020-hackathon-pts3egp)

8/28/2024: Top 5 stories on the HackerNoon homepage!

They are definitely the top notch in Android development for now. Let’s make it easy for you and review some beneficial courses for future Android developers.

Interview with Fedor Yaremenko for HackerNoon

Learn how map transformations work within the Kotlin Standard Library.

Learn how to support up and coming industries and usecases through the use of Jetpack Compose for Google Maps!

Amr Hesham has been nominated as HackerNoon contributor of the year, Kotlin.

TippingPoint is a new app that lets users deny tips and donate to charity instead.

Three programming languages Java developers should learn in 2021 and the reasons why.

Learn how to provide default values for absent keys in hash maps across Java, Kotlin, Python, Ruby, and Lua with concise examples and techniques.

2/8/2026: Top 5 stories on the HackerNoon homepage!

I've spent the last year creating this simple timer app to give the user control over all the UI colors using dynamic UI colors support.

Nulls and checked exceptions are often promoted as "bad things" in Java, this isn't the case. Both carry significant advantage over the alternatives.

Java was incepted when null-safety was not a big concern. Hence, NullPointerException occurrences are common.

Simplify your Kotlin project layout by flattening package structure using OpenRewrite. Learn how to write and test a custom recipe step-by-step.

Missing return statements cause unexpected behavior.

Nowadays, users expect mobile apps to act as counterparts to the websites and platforms they use on the web.

Explore how OpenTelemetry's @WithSpan works with Kotlin Coroutines on the JVM, tackling challenges like thread context handling for accurate telemetry.

What is minikube and how is it related to Kubernetes, which we frequently name k8s?

Learn how to protect your website images using Java's powerful 2D API for dynamic watermarking.

The use of mobile apps is increasing, and the demand for app development is contributing to its growth.

ResponseEntity breaks type safety, complicates documentation, and hinders testing.

Cloud native debugging is a tedious process of sifting through logs and analyzing dashboards. Continuous observability enables last mile investigation

This story is about how confusing annotations can be when using Kotln's own data classes and how do we fix these problem with use-site targets.

Renovate does indeed manage Kotlin Scriptings since 2022.

Polymorphic constructors aren’t built-in, but enums + static arrays can emulate them safely. This gives compile-time guarantees with scalability and performance

Dive into the implementation details of a versatile RecyclerView framework for Android applications, offering solutions for common list scenarios.

Learn how to create any type of adapters in android easily with a lot of customization.

Implicit returns are a feature in some languages. They have recently bitten me, so here's my opinion.

In this post, I want to describe how to compute the root package instead of letting the user set it.

Thank you for checking out the 171 most read blog posts about Kotlin on HackerNoon.

Visit the /Learn Repo to find the most read blog posts about any technology.