Rxjava vs kotlin. I browse job offers and in requirements is mostly rxJava than kotlin coroutines, nonetheless kotlin is more common, coroutines are cleaner and concise, why developers still use rx? is it worth learning rx? Aug 3, 2021 · Coroutines and RxJava3 I have the following method that first makes a call to a suspend method and in the same launch scope I make 2 calls to RxJava. Kotlin Flow offers a simpler but extensible API, including several already available extension functions. The operators you mentioned (map, flatMap, concatMap, and switchMap) are used to transform Jul 7, 2024 · The focus of this article is to provide a comprehensive guide for developers to use when migrating legacy RxJava code to Kotlin Coroutines and Flow. Simply put, these are all the operations performed “in the background”. /kotlinx-coroutines-reactive module. Mar 4, 2025 · We’re building robust Android apps with Kotlin Flow and RxJava, handling asynchronous data streams efficiently. If you want to know about Android Kotlin Coroutines Vs Rxjava , then this article is for you. RxJava is the most important library which is popular among Android developers. May 25, 2020 · Kotlin Flow requires less setup than RxJava, manages the lifecycle by default, handles threading cleanly, avoids nesting, and is relatively easy to use. When to Use Which Choosing between Kotlin Flow and RxJava depends on your project requirements. Join us for an in-depth exploration of the world of Android app development as we compare and contrast RxJava and Kotlin Coroutines. Introduction Recently the article about Kotlin Flow benefits over RxJava was published by Antoni … May 16, 2024 · RxJava vs Kotlin Coroutines — API comparison Operator Avoidance Using the map operator as an example, RxJava requires different operators for synchronous and asynchronous operations. Also has a lot of nice tie-ins with Android lifecycle and don't need to worry as much about memory leaks. It makes our life easy. What is Android? Android, the widely popular operating system, is the Mar 19, 2024 · Explore the RxKotlin library, which augments RxJava to make its API look more like idiomatic Kotlin. Enthusiasts and marketing departments would say yes without hesitation. Feb 1, 2024 · Android Kotlin Flow vs RxJava: A Comprehensive Comparison In Android development, managing asynchronous operations and streams of data is essential for creating responsive and scalable applications. Kotlin Flow On the other hand, using Kotlin Flow instead of RxJava, we would probably do something like the following. RxJava is a Java VM implementation of Reactive Extensions: a library for composing asynchronous and event-based programs by using observable sequences. By understanding the key differences between them, you can make an informed decision about which library best fits your needs. Both are reactive programming solutions that allow you to handle asynchronous data streams efficiently. May 12, 2023 · In Android development, the RxJava library provides several operators for working with reactive streams. Sep 17, 2017 · Can anyone please explain the difference between Observable, Completable and Single in RxJava with clear examples? In which scenario we use one over the others? Oct 22, 2019 · Kotlin Coroutines vs RxJava – spoiled for choices One of the basic requirements that most mobile app developers must meet is handling of asynchronous tasks. Jan 25, 2020 · From RxJava 2 to Kotlin Flow: Threading Comparing threading in RxJava 2 and Kotlin Flow Introduction For a long time RxJava was undisputed leader for reactive solutions on Android, though with Kotlin … Now Kotlin's concept of suspending function and flow also provides a safer and less error-prone abstraction for asynchronous operations that have similar capabilities to deal with the complex concurrent behaviour. RxJava/RxKotlin Dagger Hilt Onwards, all the code examples will be written in the Kotlin language. One of the important things in Android app development is the use of right thread for right operation to have better May 13, 2021 · The New York Times’s Android teams migrated from RxJava to Kotlin Coroutines and Flow. Can i easily transform it? What is pandan of subjects, observable from Rx in coroutines? I read about Flow, LiveData, combination of these. Two popular contenders in this arena are Kotlin Coroutines and RxJava. Please describe in detail. Feb 3, 2025 · Kotlin Coroutines: The new favorite for asynchronous tasks Kotlin Coroutines was designed to simplify asynchronous programming by using an imperative and easy-to-understand style. But anyway it is possible to migrate your code vice versa if there is need to without breaking much of the functionality. May 27, 2019 · Learn about how Reactive programming is a whole new paradigm using RxJava and RxAndroid in Android with Kotlin. Jan 11, 2018 · RxJava: Single, Maybe and Completable RxJava2 introduces different types of Observables : Flowable, Single, Maybe and Completable. There is a dedicated RxKotlin library, which is a Kotlin wrapper around the regular RxJava library. RxJava In the realm of modern software development, crafting responsive and user-friendly applications demands mastering the art Aug 23, 2024 · RxJava in Android using Kotlin RxJava is a library for composing asynchronous and event-based programs using observable sequences. RxJava can also be used with coroutines, but it requires additional setup. The choice between the two ultimately depends on your project requirements and personal preference. We compare RxJava, Coroutines and Star Wars for Android Devel Sep 4, 2025 · Kotlin Coroutines vs Threads vs Callbacks vs RxJava: Detailed Comparison with Examples 1. Mar 26, 2018 · Kotlin coroutines vs RxJava: an initial performance test Update 07/04/2018: added more clarifications to highlight the purpose of this test and added more details in the conclusion. With all the functionalities it provides, my Android programming mindset has greatly… In this article, we’ll dive into a side-by-side comparison of RxJava and Kotlin Coroutines, highlight their differences, strengths, weaknesses, and help you decide which one is better suited for May 2, 2018 · RxJava to Kotlin coroutines Observing suspenders OK, I know this is a bit of a clickbait-y title but it’s the best I could come up with. If you're working primarily in Kotlin and want a straightforward approach to asynchronous programming, Kotlin Flow is an excellent choice. Learn about the pros and cons of each approach with Ivan Mar 19, 2024 · In this article, we compared Kotlin Coroutines with RxKotlin/RxJava libraries. Learn how to integrate this in Android using RxAndroid. I want to learn RxJava. Dec 17, 2021 · When JetBrains first announced coroutines as Kotlin’s asynchronous programming solution, many developers were intrigued but doubtful whether or not this shiny new gem would be enough to solve all their asynchronous problems. It turns out that the coroutines cover the tenets of the Reactive Manifesto very well, with the possible exception of error handling. RxKotlin aims to conservatively collect these conveniences in one centralized library, and standardize conventions for using RxJava with Kotlin. Oct 11, 2022 · In this blog, we will learn about the Map vs FlatMap Operator in RxJava. RxJava on Android Now that we’ve got some of the basics under our belt, you might be wondering — what’s the best way to integrate RxJava in an Android application? As you might imagine, there are many use cases for RxJava but, in this example, let’s take a look at one specific case: using Observable objects as part of the network stack. When do you use map vs flatMap in RxJava? Say, for example, we want to map Files containing JSON into Strings that contain the JSON-- Using map, we have to deal with the Exception somehow. Although, you can somehow workaround this, for example you can use a try/catch to implement the onErrorResume. RxJava has more operators than Flow. Sep 13, 2024 · Kotlin协程 vs RxJava：现代应用开发的选择 随着现代应用开发的不断演进，开发者们面临着越来越多的并发编程挑战。在这个背景下，Kotlin协程和RxJava成为了两种备受瞩目的解决方案。本文将深入探讨这两者的优缺点，并通过示例代码展示它们在实际应用中的表现，以帮助开发者做出明智的选择。 Kotlin 13 votes, 28 comments. From the kotlin docs Passing trailing lambdas In Kotlin Kotlin Flow shines in Kotlin-centric projects with its simplicity and integration with coroutines, while RxJava excels in complex scenarios requiring extensive operator support and flexibility. This can Apr 19, 2021 · I see two differences: the RxJava version runs synchronously thus "item1" does trigger the paired function before "item2" is emitted. We will delve into the s Feb 3, 2025 · Kotlin Coroutines: The new favorite for asynchronous tasks Kotlin Coroutines was designed to simplify asynchronous programming by using an imperative and easy-to-understand style. First, we’ll look at the Single. But you can convert your Observable into Flow with asFlow first and then instead of firstOrError() use first(). Note that there is no way to convert Single into Flow because those are two incompatible types (single-value vs stream). ” A Single is something like an Observable, but instead of emitting a series of values — anywhere from none at all to an infinite number — it always either emits one value or an error notification. But ho Aug 21, 2023 · Unveiling the Power of Asynchronous Programming: Kotlin Flows vs. Apr 12, 2019 · 6 Since Kotlin is 100% interoperable with Java, you can use most Java libraries in your Kotlin projects without any difficulties—and the RxJava library is no exception. x. In RxJava, streams are a fundamental concept and represent sequences of data that can be observed and Choosing between Kotlin Flow and RxJava ultimately depends on your project requirements and personal preferences. Jun 30, 2025 · Kotlin Coroutines vs RxJava: When to Choose What in 2025 Both Kotlin Coroutines and RxJava are mature, production-ready solutions for Android async programming. We hope you find the information useful and informative. coroutines library. RxJava in Android - Learn what is RxJava? What is Observables in RxJava, how to create observables in RxJava. com Jan 23, 2025 · Discover the differences between Kotlin Coroutines and RxJava in this in-depth comparison of asynchronous programming models. As we explore these options, we’ll uncover the best fit for our needs, and discover Aug 13, 2020 · Two main approaches to implementing asynchronous code in Kotlin: the first using coroutines, the second based on the RxJava library. Coroutine builders: Integration with Flow: Suspending extension functions and suspending iteration: Note that Flowable is a subclass of Reactive Streams Publisher and extensions for it are covered by . Dec 25, 2024 · The RxJava library enables declarative data and event processing backed by solid functional programming principles. They allow developers to write asynchronous code in a sequential manner, making it easier to read and maintain. just () factory method and use it eagerly to create an instance of the object. Check: Android System Design Interviews I am Amit Shekhar Kotlin Coroutines Vs Rxjava: Memory Usage Analysis In Android When it comes to Android development, choosing the right tool for managing asynchronous tasks can feel like picking a favorite child. 2. Jun 2, 2021 · Android development is now becoming Kotlin first with Google also recommending Kotlin. It offers compatibility with existing Java codebases and has well Sep 12, 2019 · RxJava has been a lifesaver for me for a long time. I am wondering if there is a way to remove the May 17, 2018 · RxJava Operator: Map vs FlatMap RxJava is the most important library which is popular among Android developers. Jul 30, 2018 · Using RxJava with Kotlin can help you create highly reactive apps in less code, but no programming language is perfect, so I’ll also be sharing a workaround for the SAM conversion problem that many developers encounter when they first start using RxJava 2. Previous articles were about Threading … Feb 1, 2024 · Android Kotlin Coroutines Vs Rxjava . However, Kotlin Vasya's RxJava vs Flow: One of the most interesting articles I've found about this topic. Mar 27, 2023 · Kotlin Coroutines and RXJava 101 Asynchronous programming is an essential part of modern software development, allowing us to create responsive and scalable applications. May 9, 2020 · Lately I’ve been implementing a new project using Kotlin Asynchronous Flows instead of RxJava as I was used to. Here’s what we learned. Ubiquitous ReactiveX is everywhere, and it's meant for everything. My Question is "What is CompositeDisposable in RxJava?". Kotlin Flow’s coroutine-based approach and RxJava’s observables offer different strengths. I can perform different operations on them and show how the same operation performed by Kotlin flows is more efficient from a memory usage point of view Single RxJava (and its derivatives like RxGroovy & RxScala) has developed an Observable variant called “Single. Super detailed comparisons between RxJava and Flow. You can find more articles on the website. What is RxJava/RxKotlin? RxJava implements ReactiveX, an API that deals with asynchronous data streams and the propagation of data changes. Jan 8, 2024 · In this short tutorial, we’ll compare two popular ways of creating a Single object in RxJava, and we’ll test the implementations using a TestSubscriber. NET and RxJava This is a recording of a presentation Pamela Hill and myself did at JavaConf Johannesburg 2019. Jan 13, 2021 · Hi I have a rxJava observable and Flatmap which I want to convert to kotlin coroutine Flow. I am working on Android app where I use RxJava for async programming, now I want to use Kotlin coroutines. I plan to retrieve a list of about 10000 items expose them to the UI via flows and then use RxJava to do the same. Android specific bindings for RxJava 3. dispose() } note that the map in the above is a List operator from kotlin, not the map in Rxjava. However, Kotlin Kotlin Coroutines offer a simpler, more efficient way to handle asynchronous tasks, while RxJava provides powerful tools for managing complex data streams. I want to convince the Android team at my company that the memory footprint of Kotlin flows is much less than that of RxJava. Both have their strengths, but how do they stack up in terms of memory usage? Choosing between Kotlin Flow and RxJava ultimately depends on your project requirements and your team's familiarity with each library. We’ll be looking into Single, Maybe and Completable in … Introduction Does Kotlin Coroutines make RxJava and reactive programming obsolete? The answer depends on who you ask. Jul 24, 2025 · Explore Kotlin Coroutines and RxJava for Android development. Feb 15, 2025 · For Old Apps Using RxJava: If your app already runs on RxJava, switching might take time. Calling and execution stays the same. May 25, 2023 · Join us as we deep dive into Android app development and explore the similarities and differences between RxJava and Kotlin coroutines. Two popular libraries for achieving this are Kotlin Coroutines and RxJava. One day, fate led me to … kotlinx-coroutines-rx2 Utilities for RxJava 2. Kotlin has multi-platform support. Apr 11, 2022 · 总结 至此，整个RxJava的学习过程结束了，本篇文章站在RxJava应用的角度去分析，没有太过深入源码解析，这也不是本篇文章的目的，后续可能会再出一些源码解析类的文章，再就是随着Kotlin coroutine (协程)出现，Android有更多可以实现异步任务的方式。 Jan 5, 2023 · 同button的setOnClickListener一样，RxJava和kotlin flow 都是基于观察者模型实现的编程接口。 所以和button的setOnClickListener使用类似，即: Aug 10, 2022 · To convert Observable into Flow, you can use asFlow from kotlinx. Coroutines are lightweight and can be suspended and resumed without blocking threads, which is a significant advantage in terms of performance. Feb 16, 2020 · With respect to RxJava there is no difference. Its just a special syntax in kotlin known as trailing lambda. It’s a powerful tool for managing data streams and performing … RxJava was pretty good for its time, but now compared to Kotlin Coroutines, it's just really slow and costly on the cpu, unfortunately. FRONTEND Manipulate UI events and API responses, on the Web with RxJS, or on mobile with Rx. May 31, 2024 · This integration allows us to use RxJava 3 operators and flows within Kotlin core routines, as well as convert between RxJava 3 data types such as Completable, Single, or Observable with Kotlin core data types such as Deferred or Flow. We can solve so many complex use cases with the help of RxJava. You can gradually move to Kotlin’s Flow, which works like RxJava but is built into Kotlin. I utilized some convenient functions of RxKotlin like subscribeBy () and addTo () to improve readability. After that, we’ll learn about Single. Threads (OS Scheduled, Heavy) Concept: A thread is the smallest OS-scheduled unit of execution. I've spent most of my time learning RxJava but as time goes on I see most people making the switch to coroutines. Its basically the same thing, but the flow builders are a lot nicer than creating observables imo. You can use RxJava with Kotlin out-of-the-box, but Kotlin has language features (such as extension functions) that can streamline usage of RxJava even more. I know RxJava still has some operators (like debounce) that are missing on coroutines but it seems like that gap will eventually be closed. Feb 22, 2025 · This image perfectly illustrates the key differences: RxJava’s power for complex scenarios comes with a steeper learning curve and higher overhead, while Coroutines offer simplicity and efficiency for everyday asynchronous tasks in Kotlin. More specifically, it provides a Scheduler that schedules on the main thread or any given Looper. This post is a summary of how I refactored an app which Dec 29, 2019 · disposable2. If so, sooner or later developers would have to convert Rx code into coroutines or write something with coroutines from the start. Its API is so "Kotlinic" that feels well-integrated in the language. . My hope is to document the common use cases of RxJava and provide a step by step and thorough guide to translating RxJava code into the more modern and native Kotlin Coroutines and Flow. Kotlin‘s concise and modern syntax integrates beautifully with RxJava to create robust and scalable Android architectures. Hi folks, I was wondering if anyone knew of any benefits of RxJava over Kotlin Coroutines. By understanding the strengths and weaknesses of each, you can make an informed decision that best fits your development needs. trueI used to be an Rx programmer but have switched to flows since moving to Kotlin/Coroutines. Both libraries offer powerful tools for managing asynchronous data streams, but they cater to different needs and programming styles. Explore how you can seamlessly migrate from RxJava to Kotlin Coroutines and Flow. To achieve this, developers often rely on tools like Kotlin Flow and RxJava. We use RxJava for multithreading, managing background tasks, and removing callback hells. This module adds the minimum classes to RxJava that make writing reactive components in Android applications easy and hassle-free. I don't know what Flow does Gather ‘round mobile app experts! Ivan Dimitrov, Mobile Developer at Devexperts, will explore the similarities and differences between RxJava and Kotlin Coroutines and share his experience in Kotlin Flow offers a more straightforward approach for Kotlin-centric projects, while RxJava provides a rich set of features for complex data manipulation and interoperability. Gather ‘round mobile app experts! Ivan Dimitrov, Mobile Developer at Devexperts, will explore the similarities and differences between RxJava and Kotlin Coroutines and share his experience in Oct 9, 2017 · I am an Android Student. Compare their features, performance, and best use cases to find the right fit for your projects. Why? I saw this talk from… Consider this article if you want to dive deeper into performance test: Kotlin coroutines vs RxJava: an initial performance test Simply Put Imagine you’re at a restaurant, and you place an order. In kotlin if you have a function with a lambda as last parameter then you can move that lambda out of parentheses. fromCallable () and see how to use it to improve performance. May 29, 2024 · In conclusion, Kotlin Coroutines and RxJava are both powerful tools for building reactive Android apps. Single. Conversion functions: May 1, 2020 · The RxJava implementation is much more concise (32 lines of code VS 56 lines of code in the callback implementation). Jan 25, 2020 · On the approaches to handling threading Kotlin Flow and RxJava have opposite concepts: in RxJava we think in terms of top-to-bottom, when in Kotlin Flow from bottom-to-top. Second, RxJava's merge implementation is a bit eager and checks all inputs for more items, thus when "item1" uppercase gets signaled via the subject, merge will see it and forward it before allowing just to continue with "item2". Learn how to harness the power of Reactive Programming in Kotlin using RxJava and Kotlin Flow, and explore code samples to get started. If you already have your projects in Kotlin or you are thinking to start a new one, you might have thought about different aspects like architecture, performance, 3rd party libraries etc. May 17, 2020 · The Real Kotlin Flow benefits over RxJava Attempt to analyze the benefits of Kotlin Flow over RxJava. We will delve into the s Mar 25, 2024 · Flow和RxJava都是处理异步数据流的强大工具，但它们在设计理念、API风格、以及与Kotlin协程的集成程度上存在一些差异。 以下是它们的主要区别和各自的应用场景： Flow（Kotlin Coroutines）1. rxJava observable val startFuellingObservable: Observable<Void> subscription / flatmap subscriptio Jun 2, 2024 · Kotlin Coroutines vs RxJava: A Performance Comparison for Reactive Programming in Android Apps 2 June 2024 When building Android applications, developers often face the challenge of managing complex workflows and handling asynchronous tasks. If the lambda is the only parameter then you can also remove the parentheses. Generally speaking, Kotlin for Android has become better and better, to the point were using Java now is more a "i don't wanna learn kotlin" choice. At that time, in the Java world, the market standard was the reactive library RxJava (which also has equivalents in other languages – […] From RxJava to Kotlin Flow: Stream Types Comparing Stream Types in RxJava and Kotlin Flow This post is part of series of comparing RxJava to Kotlin Flow. We’ll choose the right library for our project, simplifying development and improving performance. Since Coroutines are currently experimental, there is always the prospect Feb 26, 2020 · In both RxJava and Kotlin Flow there are general reactive types to represent stream which might have from 0 to (almost) infinite number of events (followed by completion with or without error). See full list on stackoverflow. It is lightweight and integrates well with other Kotlin features. just () Kotlin Flow offers a more straightforward approach for Kotlin developers, while RxJava provides a powerful toolkit for complex reactive programming. You will find a lot of information about Android Kotlin Coroutines Vs Rxjava in this article. Chain async call by flatmap ( ) Jun 19, 2024 · What is faster and in which tasks? Coroutines, RxJava, Executor? Have you ever wondered which multithreading framework is the fastest? I have occasionally wondered. If you are working primarily with Kotlin and want a simple, coroutine-based approach, Flow is a great choice. It extends the observer pattern to support sequences of data/events and adds operators that allow you to compose sequences together declaratively Join us for an in-depth exploration of the world of Android app development as we compare and contrast RxJava and Kotlin Coroutines. Understanding Kotlin Coroutines Kotlin Coroutines are a part of the Kotlin programming language, designed to simplify asynchronous programming. RxKotlin is a lightweight library that adds convenient extension functions to RxJava. 0 with Kotlin. Jun 3, 2023 · Interoperability: RxJava works seamlessly with Java and provides RxKotlin bindings for improved integration with Kotlin. 3qxg 8vz j2n3k9 eyprm dcj 3qpwo z1vcd sxjf9 nbb6 chj