canh912009 / mvi-coroutines-flow

Play MVI with Kotlin Coroutines Flow | MVI pattern on Android using Kotlin Coroutines Flow | Dagger Hilt DI | Koin DI | SharedFlow | StateFlow | Arrow.kt Android Sample

MVI-Coroutines-Flow

MVI-Coroutines-Flow-Clean-Architecture

MVI-Coroutines-Flow-Clean-Architecture-ArrowKt

MVI-Coroutines-Flow-Clean-Architecture-ArrowKt-KoinDI

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Coroutine + Flow = MVI ❤️

• Play MVI with Kotlin Coroutines Flow.
• Multiple modules, Clean Architecture, Functional programming with ΛRROW.kt.
• Unit tests for MVI ViewModel, domain and data layer.
• Master branch using Koin for DI.
• Checkout dagger_hilt branch, using Dagger Hilt for DI (obsolete, will update as soon as possible).
• Download latest debug APK here.

More

1. Jetpack Compose Version

👉 https://github.com/Kotlin-Android-Open-Source/Jetpack-Compose-MVI-Coroutines-Flow

2. Pagination Horizontal List in Vertical List

👉 https://github.com/Kotlin-Android-Open-Source/Pagination-MVI-Flow

Light theme

List view state	Error view state

Add new user	Search user

Dark theme

List view state	Error view state

Add new user	Search user

MVI pattern

This pattern was specified by André Medeiros (Staltz) for a JavaScript framework he has written called cycle.js. From a theoretical (and mathematical) point of view we could describe Model-View-Intent as follows ¹

• intent(): This function takes the input from the user (i.e. UI events, like click events) and translate it to “something” that will be passed as parameter to model() function. This could be a simple string to set a value of the model to or more complex data structure like an Object. We could say we have the intention to change the model with an intent.
• model(): The model() function takes the output from intent() as input to manipulate the Model. The output of this function is a new Model (state changed). So it should not update an already existing Model. We want immutability! We don’t change an already existing Model object instance. We create a new Model according to the changes described by the intent. Please note, that the model() function is the only piece of your code that is allowed to create a new Model object. Then this new immutable Model is the output of this function. Basically, the model() function calls our apps business logic (could be an Interactor, Usecase, Repository … whatever pattern / terminology you use in your app) and delivers a new Model object as result.
• view(): This method takes the model returned from model() function and gives it as input to the view() function. Then the View simply displays this Model somehow. view() is basically the same as view.render(model).

Reference

• Model-View-Intent Design Pattern on Android
• Reactive Apps with Model-View-Intent

Contributors ✨

Thanks goes to these wonderful people (emoji key):

Petrus Nguyễn Thái Học 💻 🚧 🤔 🎨 🐛

This project follows the all-contributors specification. Contributions of any kind welcome!

Footnotes

1. https://hannesdorfmann.com/android/mosby3-mvi-2/ ↩