What is KOIN?
A pragmatic lightweight dependency injection framework for Kotlin developers.
Written in pure Kotlin, using functional resolution only: no proxy, no code generation, no reflection.
Koin is a DSL, a light container and a pragmatic API
Official Website 👉 https://insert-koin.io
Beta version 👉 https://beta.insert-koin.io
Contact & Latest News 🌐
- Follow us on Twitter for latest news: @insertkoin_io
- Koin developers on Medium: koin developers hub
Getting Help 🚒
Any question about Koin usage?
- Come talk on slack #koin channel
- Post your question on Stackoverflow - #koin tag
Reporting issues 🛠
Found a bug or a problem on a specific feature? Open an issue on Github issues
Setup
Current Version
// latest stable
koin_version = '1.0.2'
// current beta
koin_version = '2.0.0-beta-1'Gradle
Jcenter
Check that you have the jcenter repository.
// Add Jcenter to your repositories if needed
repositories {
jcenter()
}Dependencies
Choose your Koin dependency:
Core features
// Koin for Kotlin
implementation "org.koin:koin-core:$koin_version"
// Koin extended & experimental features
implementation "org.koin:koin-core-ext:$koin_version"
// Koin for Unit tests
testImplementation "org.koin:koin-test:$koin_version"
// Koin for Java developers
implementation "org.koin:koin-java:$koin_version"Android
// Koin for Android
implementation "org.koin:koin-android:$koin_version"
// Koin Android Scope feature
implementation "org.koin:koin-android-scope:$koin_version"
// Koin Android ViewModel feature
implementation "org.koin:koin-android-viewmodel:$koin_version"AndroidX
// AndroidX (based on koin-android)
// Koin AndroidX Scope feature
implementation "org.koin:koin-androidx-scope:$koin_version"
// Koin AndroidX ViewModel feature
implementation "org.koin:koin-androidx-viewmodel:$koin_version"Ktor
// Koin for Ktor Kotlin
implementation "org.koin:koin-ktor:$koin_version"Quickstart
Declare a Koin module
Write with the Koin DSL what you need to assemble:
// Given some classes
class Controller(val service : BusinessService)
class BusinessService()
// just declare it
val myModule = module {
single { Controller(get()) }
single { BusinessService() }
} Starting Koin in Koin 2.0
Use the startKoin() function to start Koin in your application.
In a Kotlin app:
fun main(vararg args : String) {
// start Koin!
startKoin {
modules(myModule)
}
} In an Android app:
class MyApplication : Application() {
override fun onCreate(){
super.onCreate()
// start Koin!
startKoin {
androidContext(this@MyApplication)
modules(myModule)
}
}
} Articles
Articles & resouces about Koin
- Migration from Dagger2 to Koin
- From Dagger to Koin, a step by step migration guide
- Koin in Feature Modules Project
- A brief look at Koin on Android
- Bye bye Dagger
- Testing with Koin
- Painless Android testing with Room & Koin
- Unlock your Android ViewModel power with Koin
- Using dependency injection with Koin
- Koin + Spark = ❤️
- Push SparkJava to the next level (Kotlin Weekly issue 73, DZone.com )
- When Koin met Ktor ... (Kotlin Weekly issue 72)
- Android Dependency Injection – Why we moved from Dagger 2 to Koin?
- Moving from Dagger to Koin - Simplify your Android development - (Kotlin Weekly issue 66 & Android Weekly issue 282)
- Kotlin Weekly #64
- Insert Koin for dependency injection
- Better dependency injection for Android
Talks & podcasts
- Simplify your Android development with Koin
- Talking Kotlin - Dependency injection with Koin
- L'injection de poireaux avec Koin - AndroidLeaks ep42 (French)
Koin developers hub
- News from the trenches, What's next for Koin?
- Koin 1.0.0 Unleashed
- Opening Koin 1.0.0 Beta
- On the road to Koin 1.0
- Koin 0.9.2 — Maintenance fixes, new branding, roadmap for 1.0.0 & some other nice announces
- Koin 0.9.1 - Bug fixes & Improvments
- Koin 0.9.0 - Getting close to stable
- Unlock your Android ViewModel power with Koin
- koin 0.8.2 Improvements bugfixes and crash fix
- Koin release 0.8.0
Contributors
This project exists thanks to all the people who contribute. [Contribute].
OpenCollective
Backers
Thank you to all our backers! 🙏 [Become a backer]
Sponsors
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