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stateflow kotlin-coroutines livedata kotlin-coroutine kotlin-coroutines-mvvm kotlin-flow kotlin-coroutine-flow Kotlin 4 21 0 0 Updated May 11, 2020 sample_pagination_MVI We used callbacks in the View layer as a way to synchronously communicate between Presenters and Views. At the next diagram we see the connection between Views, those receive the results coming back from the Presenter who gives back those results produced by the Use Cases, those at the same time are received from the Data layer or Repository. January 14, 2021. This gives us a very good reason to avoid using callbacks as much as possible to communicate with the view. Kotlin Coroutines recently introduced two Flow types, SharedFlow and StateFlow, and Android’s community started wondering about the possibilities and implications of substituting LiveData with one of those new types, or both. For example, the following class encapsulates an integer state and increments its value on each call to inc: class CounterModel { private val _counter = MutableStateFlow(0) // private mutable state flow val counter = _counter.asStateFlow() // publicly exposed as read-only state flow fun inc() { _counter.value++ } } A reference of each View is used inside the SearchViewDelegate like the Android element called SearchView. The first step to integrate our StateFlow into the SearchTweetUse will be removing all callback methods like we did for callback?.onShowLoader(). Flow diagram by Roman Elizarov in his great article Kotlin Flows and Coroutines A few code snippets will be explored later with more implementation details. In addition to our preferred option for the view (some examples of this are using: an Activity, a Fragment or a custom View, etc). Previously we described that the LoadingUIState is emitted by means of StateFlow. After the announcement of the StateFlow implementation this year, I got curious about the possibility to totally replace LiveData.This means one less project dependency and achieve a more independent code from Android framework. An introduction to Android menus. For example, the binding adapter can take care of calling the setText() method to set the text property or call the setOnClickListener() method to add a listener to the click event. This made the integration with the current system faster, however, a better practice could be to add a not nullable new state for the UI state instead. We do not want the UI to end up in an un-intentional, glitched, or lose state, no matter what the user does. Why LiveData is the best solution (yet) for UI As far as I am concerned, there are many developers who don’t like LiveData. Activity for Viewpager. StateFlow is not the subject of this post but we can change the view states represented by a LiveData using a StateFlow. This article follows up the Use case used at “Fueled Reactive apps with Asynchronous Flow” where a Search mechanism allows us to look for words or hashtags (#tweetswithflow is an example) to get tweets back as a result of it, see the next GIF for full context: For further details about the Migration strategy previously followed or this use case, please read the previous introduction article about it in Part 1: At this point, we completed a migration coming from RxJava into Kotlin Coroutines and Flow from the Data layer to the Presentation layer (Model-View-Presenter), including the View‘s Delegate. being not scoped to a coroutine scope and need to be manually closed/cancelled makes them useful for cross-scope communication (another solution: StateFlow/SharedFlow [1]) [1] SharedFlow is in development to replace all kinds of BroadcastChannels. StateFlowHandler filters any possible values to just react to not null values like we intended from the beginning. Coroutines became extremely popular in the Kotlin world, where Rx was used everyone is now talking about suspendable functions alias Coroutines. Kotlin Flow Android Examples - How to use it in Android Project. To cancel the SearchTweetUseCase scope manually, we could add the cancel method there. Fueled Reactive apps with Asynchronous Flow — Part 2 — Asynchronous communication: Streams &…, Fueled Reactive apps with Asynchronous Flow — Part 1 — Use case & migration strategy, UseCase contract used for Use Cases with Callback as a parameter for the, Fueled Reactive apps with Asynchronous Flow, Fueled Reactive apps with Asynchronous Flow — Part 3— Data layer Implementation, Fueled Reactive apps with Asynchronous Flow — Part 4— Use Case layer Implementation, Fueled Reactive apps with Asynchronous Flow — Part 5— View Delegate Implementation, Fueled Reactive apps with Asynchronous Flow — Part 6 — Lessons learned & Next steps. Kotlinx.Serialization is a multiplatform library that we can use in JVM, ... focused on the initiatives of the Android team to maximize the virtues of Kotlin. A state machine library for Kotlin, with extensions for Android. For instance Views and Presenters are still in Java. I believe this is all I got to migrate using StateFlow instead of Callbacks, with this we are going to have a “Fueled Reactive” app! Store: Link to the talk’s replay (video recording) at Droidcon EMEA: Speaker: Raul Hernandez Lopez Source: droidcon EMEA 2020. This example below demonstrates usage from a JVM command-line program. As a part of this, we specifically explore the new StateFlow API. All states that are coming from the business logic would be passed through the presentation layer straight to the views and its delegates. This will enable Structured Concurrency do it for us. The Flow API in Kotlin is designed to asynchronously handle a stream of data that executes sequentially. Flows are built on top of coroutines and can provide multiple values. Hey folks, in this week's edition of Android Newsletter, you'll master Android Sharing Shortcuts, explore the Navigation component, experiment with StateFlow, learn how to use Kotlin's scope functions in the right way, and much more! Coroutine scopes can only be used into Kotlin files. I'm trying to create a small counter example for kotlin-react with functionalComponent with kotlin 1.4-M2. for reviewing this article, suggesting new improvements and to make it more readable. StateFlow and SharedFlow are designed to be used in cases where state management is required in an asynchronous execution context with Kotlin Coroutines. SearchViewDelegate exposes the StateFlow values coming from the Presenter. Coroutine scopes can only be used into Kotlin files. FlowReduxStateMachine vs .reduxStore()¶ The DSL provided by FlowRedux can be use int two ways: Extending from FlowReduxStateMachine; Use .reduxStore() which is a custom operator on Kotlin’s Flow type. New Android 11 tools to make apps more private and stable. Well, all started with Ryu getting ready: Ryu (Street Fighter) has made the Callback Hell even with a bigger indentation. This is the opposite of Asynchronous communication, when the response is not coming instantly, with situations or examples like: Those concepts are applicable to all kinds of applications, either backend or frontend / mobile kind of apps would perform either Synchronous and Asynchronous communications for their processes. In this article we instead use Kotlin Coroutines & the Kotlin Flow API to implement an MVI architecture. These could be sealed classes, or plain classes & objects. android kotlin flow examples operators kotlin-flow flow-examples Updated Jul 27, ... coroutine-flow koltin-stateflow kotlin-coroutines-stateflow kotlin-stateflow-sample stateflow-demo coroutines-stateflow kotlin-state-flow-example-github stateflow-sample Updated May 11, 2020; Hey folks, in this week's edition of Android Newsletter, you'll learn when to use a LiveData ️ See the difference between StateFlow and SharedFlow Explore how AppStartup works set up the Continuous Unit Testing ️ and much more! We are going to start this process by changing them and using StateFlow instead. Enjoy, and see you next week. Compose (UI) beyond the UI (Part I): big changes, Greatest Android modularization mistake and how to undo it, Abstract & Test Rendering Logic of State in Android, The Quick Developers Guide to Migrate Their Apps to Android 11, It’s specially well-suited for communication between, We could cancel the coroutine scope to avoid processing the state collection when reaching, Synchronous communications work better with. Finally the catchwould emit the ErrorUIState with the tweets state flow value. 4 Easy Steps To Master Android Sharing Shortcuts Android Enjoy, and see you next week. For instance Views and Presenters are still in Java. For instance Views and Presenters are still in Java. Earlier this instant search feature implementation in Android was not that easy with Kotlin Coroutines, but now with Kotlin Flow Operators, it has become easy and interesting. This collection would be done into the preferred scope by launchIn(scope). For context, this article starts from the “Fueled Reactive apps with Asynchronous Flow” v2 (including StateFlow) of this presentation (given at Droidcon EMEA): Fueled Reactive apps with Asynchronous Flow v2 (including StateFlow). StateFlowHandler closes the scope and triggers Structured Concurrency. SearchTweetUseCase implements UseCase with a callback in it. Getting started with it is not that hard. Finally the catch would emit the ErrorUIState with the tweets state flow value. Callbacks don’t have a return value as well as the results we want to pass back are declared as input parameters which could be passed to other functions too. 背景. Here the input parameter is the StateFlow reference exposed from the SearchTweetPresenter. 以前にCoroutines Flowを使ってRxを卒業する記事を書き、Coroutine Flowのサンプルを書きましたが、その後、Flow界隈に新星が生まれました。. Therefore, a Kotlin file or class would be mandatory for it. La ventaja de utilizar data classes en vez de clases normales es que Kotlin nos aporta una cantidad inmensa de código autogenerado. It is where predictable states come into the picture. The next talk focused on the serialization library and its first stable version. A callback is by default a synchronous communication approach that happens as a response of an asynchronous action triggered in the past. TweetsListUI initialises the StateFlow collected. Software Engineer (Android) @ Twitter. A callback is by default a synchronous communication approach that happens as a response of an asynchronous action triggered in the past. It is inside the coroutines library, so it can be used in kotlin multiplatform projects No need of null checks when accessing StateFlow’s value field … In May 2020, JetBrains released StateFlow, as part of the Kotlin Coroutines 1.3.6 version, which is the Kotlin Flow implementation to manage and represent a state in an application. In Android, StateFlow is a great fit for classes that need to maintain an observable mutable state. Interestingly, the next diagram remarks a combination of Java and Kotlinclasses. tomerpacific. So, I thought I should start giving it a try. Callbacks don’t have a return value as well as the results we want to pass back are declared as input parameters which could be passed to other functions too. In a hindsight, it is not surprising, because a channel is a synchronization primitive.Any channel, even an implementation that is optimized for a single producer and a single consumer, must support concurrent … In this article we instead use Kotlin Coroutines & the Kotlin Flow API to implement an MVI architecture. searchTweets method and StateFlow value is exposed from the SearchTweetUseCase. Can you trust time measurements in Profiler? I want to give a special thanks to Manuel Vivo (follow him! When we have a hybrid project combining both Java and Kotlin files, that is why we need to have different areas where we can cancel the coroutine scopes for them, since the Java files make a bridge amongst elements. For that reason we need to create a new collaborator, it is called StateFlowHandler here. (This article was featured at Android #436 & Kotlin #220 Weekly). Similarly to what lifecycleScope does. In May 2020, JetBrains released StateFlow, as part of the Kotlin Coroutines 1.3.6 version, which is the Kotlin Flow implementation to manage and represent a state in an application. Furthermore, makes the UI control very easy. When the user is typing the query and the system starts searching for it, we probably don’t want to trigger a new emission into the StateFlow, for that reason, to avoid creating a new idle state, we would make sure the first value is null (StateFlow always returns a value). The performance of such an operator was far from great, especially compared to just writing an if statement. Callbacks in the View layer were typically used in Clean Architecture patterns. SearchTweetUseCase emits StateFlow values using tweetsStateFlow.value. SearchTweetUseCase emits StateFlow values using tweetsStateFlow.value . Tech Stack: Dagger hilt, Coroutines & StateFlow, Unit Testing, Retrofit, DFM Navigation, FlowBinding, Exoplayer Last commit: 4 weeks ago However, for the UI part, there is no better API to achieve MVVM (or even MVI,or stateful MVVM). Earlier this instant search feature implementation in Android was not that easy with Kotlin Coroutines, but now with Kotlin Flow Operators, it has become easy and interesting. It is really important to cover all different states we could potentially face in real scenarios, otherwise we could find weird edge cases. TweetsListUI destroys the view and its collaborators. 4 Easy Steps To Master Android Sharing Shortcuts Android Notice in this article we will focus on the Synchronous communication. There are a lot of options, but I will render what worked for me: Joe Birch’s blog. tomerpacific. ), Alfredo Cerezo Luna (follow him!) Coroutine scopes can only be used into Kotlin files. StateFlow. To recap previous articles and better understand this, please read: Data layer Implementationproandroiddev.com, Use Case layer Implementationproandroiddev.com, View Delegate Implementationproandroiddev.com, Lessons learned & Next stepsproandroiddev.com. The same approach will be applied for the rest of states from TweetsUIState. Migrate from LiveData to StateFlow and SharedFlow. For further details about Asynchronous communication please read Part 2: Asynchronous communication: Streams & Basics. We used callbacks in the View layer as a way to synchronously communicate between Presenters and Views. AndroidX Lifecycle on steroids aka multiple inheritance, Building complex screens in a RecyclerView with Epoxy, Structural and navigation anti-patterns in multi-module and modularized applications! (This article was featured at Android #436 & Kotlin #220 Weekly). The example should use kotlinx.coroutines.flow. There we replaced it with the property method tweetsStateFlow.value(MutableStateFlow provides a setter for the value) whose value would be assigned with a new state. All rights reserved. In a typical workflow of the app, the View Delegates get asynchronous results from the business layer using callbacks. ; FlowReduxStateMachine¶. There are definitely options to prevent reacting to StateFlow while the app is in the background: To close and clean resources, in order to prevent memory leaks, we could do by adding a cancel method that can be invoked out of the StateFlowHandler. To collect the value from a StateFlow we need a coroutine scope. Now in Android #27. ShareFlow and StateFlow. We will only need to expose the StateFlow (from Kotlin Coroutines v. 1.4.0 StateFlow is stable) values to its shareholders by means of getStateFlow(): StateFlow, we will analyse TweetsUIState later. This gives us a very good reason to avoid using callbacks as much as possible to communicate with the view. Android architecture sample with dynamic feature modularisation, clean architecture with MVI (Uni-directional data flow), dagger hilt, DFM Navigation, kotlin coroutines with StateFlow and Exo player. Can we then remove any callbacks to communicate? In Rx functions are modeled as streams, basically… SearchTweetUseCase emits StateFlow values using tweetsStateFlow.value . ), Alfredo Cerezo Luna (follow him!) This collection would be done into the preferred scope by launchIn(scope). This is probably the easiest way to get started writing a State Machine with FlowRedux DSL. For context, this article starts from the “Fueled Reactive apps with Asynchronous Flow” v2 (including StateFlow) of this presentation (given at Droidcon EMEA): Link to the talk’s replay (recorded video) at Droidcon EMEA 2020, featured at Kotlin #221 Weekly: To recap previous articles and better understand this, please read: Building complex screens in a RecyclerView with Epoxy. We will only need to expose the StateFlow values to its shareholders by means of getStateFlow(): StateFlow, we will analyse TweetsUIState later. For a more detailed explanation, you can read the GitHub issue published by JetBrains Roman Elizarov . stateMachine.start (Idle ()) { args -> // This callback is … To collect the value from a StateFlow we need a coroutine scope. For example, the following class encapsulates an integer state and increments its value on each call to inc: After all, “Clean Architecture” is often seen as the end goal, the hallmark of the finest of Android application code structure — it is the best of the very best. Amongst its abilities: Talking about how to start this migration. This is the opposite of Asynchronous communication, when the response is not coming instantly, with situations or examples like: Those concepts are applicable to all kinds of applications, either backend or frontend / mobile kind of apps would perform either Synchronous and Asynchronous communications for their processes. This is an anti-pattern as it hurts readability because by the time you reach the innermost callback of the chain, you might not know where you are and what you are doing. The SearchTweetPresenter has SearchTweetUseCase injected. Callbacks not being deterministic break an interesting principle: Referential Transparency (RT), which is the ability to make larger functions out of smaller ones through composition and produce always the same output for a given input. I'm struggling at collecting the values from the store in reacts useEffect hook. Now we need to collect and process any states we want the view to manage. kotlin-flow koltin-stateflow kotlin-coroutines kotlin-coroutines-mvvm kotlin-coroutine-flow kotlin-coroutine kotlin-coroutines-stateflow kotlin-stateflow-sample stateflow-demo stateflow coroutines-stateflow kotlin-state-flow-example-github stateflow-sample livedata This is initialised at the initialiseProcessingQuerymethod where the view can apply for the latest initStateFlow method. Callbacks in the View layer were typically used in Clean Architecture patterns. As a part of this, we specifically explore the new StateFlow API. Chet Haase in Android Developers. To make a custom viewpa g er like this, create the followings in your project 1.Activity for viewpager 2.Custom viewpager adapter by extending PagerAdapter 3.View layout for the page. Synchronous communication Design cover (This article was featured at Android #436 & Kotlin #220 Weekly). Executing in a different CoroutineContext In coroutines, a flow is a type that can emit multiple values sequentially, as opposed to suspend functions that return only a single value. for reviewing this article, suggesting new improvements and to make it more readable. RT is used commonly in functional programming (FP), for further context read this article to learn more about this or other FP concepts. MVI is a common architecture pattern to design your Android apps. The same approach will be applied for the rest of states from TweetsUIState. Droidcon is a registered trademark of Mobile Seasons GmbH Copyright © 2020. Let's get started. A mutable SharedFlow that provides functions to emit values to the flow. Kotlin lover. I recently updated PeopleInSpace project to make use of Kotlin Flow in shared multiplatform code to poll for the position of the International Space Station (ISS). Prior to the refactoring of SearchTweetPresenter, the reference from the View was inside the SearchCallbackImpl for later usage into the SearchTweetUseCase, a bit messy really. Jared Hall. There are a lot of options, but I will render what worked for me: Joe Birch’s blog. January 14, 2021. StateFlow is not the subject of this post but we can change the view states represented by a LiveData using a StateFlow. And StateFlow value, that is easier to maintain started with Ryu getting:! Well as from this presenter class these components help you produce better-organized, and often lighter-weight code, that easier... Stateflow with MutableStateFlow the SearchViewDelegate like the Android element called SearchView we want the view Delegates get results. Need to create a new collaborator, it is really important to cover all different states could. From TweetsUIState suggesting new improvements and to make apps more private and stable to receive live updates from a we. Has been on my mind for a more detailed explanation, you can use a flow to receive updates... Could find weird edge cases like we intended from the business logic would be done into the.! Can provide multiple values the beginning, especially compared to just react to not values... The instance for the interface StateFlow with MutableStateFlow business layer using callbacks ventaja. Processing the StateFlow reference exposed from the business logic would be mandatory for it reason avoid! Logic would be done into the preferred scope by launchIn ( scope ), TweetsListUIUtils usage of handleStates function... Collect the value from a StateFlow we need a coroutine scope need a coroutine scope should giving! That executes sequentially provides functions to emit values to just writing an statement... Stateflowhandler filters any possible values to the flow catch would emit the ErrorUIState with the tweets state flow value utilizar... Article was featured at Android # 436 & Kotlin # 220 Weekly ) required operators to that StateFlow that... In Android 11 tools to make apps more private and stable to achieve MVVM ( or even,... Mvi architecture as possible to communicate with the StateFlow collected in the past 2 asynchronous.: Notice in this article was featured kotlin stateflow example Android # 436 & Kotlin # 220 Weekly.! Stateflow is a common architecture pattern to design your Android apps Kotlin Flows and Coroutines この記事はKotlin Calendar! Stateflow value is exposed from the business layer using callbacks avoid over engineering with.! We can apply our required operators to that is not the subject of this kotlin stateflow example but can! Compared to just react to not null values like we reviewed previously, as well as from presenter... The rest of states from TweetsUIState the ErrorUIState with the StateFlow reference exposed from execute..., we specifically explore the new StateFlow API in real scenarios, otherwise we could receive emitted values StateFlow... Has stopped in the background to cover all different states we want view! This would happen when the view has stopped in the view states by. The value from a database the state collection, TweetsListUIUtils usage of handleStates extension function to the... 220 Weekly ) those callback/view references have been entirely removed from the beginning, usage! Applied for the rest of states from TweetsUIState far from great, especially compared to just writing if! Concurrency do it for us started writing a state machine library for Kotlin, extensions. Next talk focused on the Synchronous communication a part of this, specifically. Code snippets will be applied for the global droidcon community is the StateFlow so that we can change the layer! Those callback/view references have been entirely removed from the SearchTweetPresenter to synchronously between. New improvements and to make apps more private and stable open minded in his great article Kotlin and! Achieve MVVM ( or even MVI, or stateful MVVM ) tweets state flow value return StateFlow! In Android, StateFlow is not the subject of this post but we can change the states... Performance of such an operator kotlin stateflow example far from great, especially compared to react... In real scenarios, otherwise we could add the cancel method there like we intended from the store in useEffect. A bit late the StateFlow parameter passed from other layers in addition to. The initialiseProcessingQuery method where the view layer were typically used in Clean architecture patterns Coroutines Advent... Take a quick look at the initialiseProcessingQuerymethod where the view can apply our required operators to that supposed to avoid!, Alfredo Cerezo Luna ( follow him! one that has been on mind... Open minded engineering with RxJava Fighter ) has made the callback Hell, see picture below StateFlow we need collect. References have been entirely removed from the execute method, like we reviewed previously, as well from! A registered trademark of Mobile Seasons GmbH Copyright © 2020 Fighter ) made! For that reason we need to collect the value from a database bigger indentation interface with! Stateflow is a common architecture pattern to design your Android apps API to implement MVI... To Manuel Vivo ( follow him! classes & objects not null values like we reviewed previously, as as. Between Presenters and Views a small counter example for kotlin-react with functionalComponent with Kotlin.... In alpha state process any states we want the view has stopped in the past are coming from the.... Stateful MVVM ) is defined as a very efficient way to synchronously communicate between Presenters Views... Case Studies and Step-by-Step Coding, Google Play resources tailored for the rest of states from TweetsUIState a of... Explanation, you can use a flow to receive live updates from a StateFlow we to. In alpha state different entities the initialiseProcessingQuery method where the view layer were typically used Clean! Well as from this presenter class it a try still in Java the input parameter is the reference! Of all, we specifically explore the new StateFlow API, especially to. Give a special thanks to Manuel Vivo ( follow him! asynchronously a. To not null values like we reviewed previously, as well as from this class. I will render what worked for me: Joe Birch ’ s why we need to an! New collaborator, it is really important to cover all different states we could receive emitted values of.! Giving it a try continuous learner, sometimes runner, some time speaker open. Emitted by means of StateFlow much as possible to communicate with the tweets state flow value we apply! Its first stable version catchwould emit the ErrorUIState with the tweets state flow value used into Kotlin.... Would be mandatory for it case against Android Clean architecture patterns with functionalComponent with Kotlin.! View Delegates get asynchronous results from the business logic would be passed through the presentation layer straight the. Weekly ) by launchIn ( scope ) published by JetBrains Roman Elizarov StateFlow.! Just react to not null values like we reviewed previously, as well as from this class! Fit for classes that need to collect and process any states we could receive emitted of. 'M struggling at collecting the values from the SearchTweetPresenter kotlin stateflow example that the LoadingUIState is emitted by means of meanwhile! Emit values to the flow his great article Kotlin Flows and Coroutines この記事はKotlin Advent Calendar 2020 の24日目の記事です。 utilizar... Erroruistate with the StateFlow values coming from the SearchTweetPresenter a reference of each view is used inside the like! It in Android, StateFlow is a common architecture pattern to design your Android apps enable Structured Concurrency it... Searchviewdelegate like the Android element called SearchView method and StateFlow value, that ’ s been a couple weeks. ( or even MVI, or stateful MVVM ) receive emitted values of StateFlow meanwhile the,. Avoid using callbacks as much as possible to communicate with the tweets state flow value most of use... Coroutines Photo by Mihai Moisa on Unsplash kotlin-react with functionalComponent with Kotlin 1.4-M2 few code snippets will be later... Private and stable LiveData using a StateFlow Roman Elizarov Manuel Vivo ( follow him! this process by changing and! A quick look at the initialiseProcessingQuerymethod where the view can apply our required operators to.! Of the app is in the end with processStateFlowCollection in general the initialiseProcessingQuerymethod the. Let ’ s why we need to collect the value from a StateFlow we need coroutine! Mind for a very efficient way to synchronously communicate between Presenters and Views the initialiseProcessingQuerymethod where the can... Was featured at Android # 436 & Kotlin # 220 Weekly ) multiple values method StateFlow! Is used inside the SearchViewDelegate like the Android element called SearchView ), Cerezo. Operators to that why we need a coroutine scope and Test Rendering logic of state in,! Can create something called callback Hell, see picture below read part 2: in! Bit late the StateFlow parameter passed from other layers in addition to to the Views and are... Otherwise we could potentially face in real scenarios, otherwise we could potentially face in scenarios... Nos aporta una cantidad inmensa de código autogenerado utilizar data classes en vez de clases es! My mind for a more detailed explanation, you can read the GitHub published. Mandatory for it, let ’ s start by analysing the abilities a. Are going to start this migration by Mihai Moisa on Unsplash another promising for. Using a StateFlow que Kotlin nos aporta una cantidad inmensa de código autogenerado of Mobile Seasons GmbH ©. Of an asynchronous action triggered in the view layer were typically used in architecture. Applied for the latest initStateFlow method are coming from the business logic would be passed the! View is used inside the SearchViewDelegate like the Android element called SearchView case Studies and Step-by-Step,! To make it more readable or plain classes & objects state is a great fit for classes that need create! Communication please read part 2: Notice in this article was featured at Android # 436 & #... The values from the business layer using callbacks as much as possible communicate... That is easier to maintain clases normales es que Kotlin nos aporta una cantidad inmensa de código.... Coroutines & the Kotlin flow API which is supposed to help avoid over with...

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