Koin —A Kotlin Native Dependency Injection Library

Koin —A  Kotlin Native Dependency Injection Library

How to scope dependencies

Introduction

As the Android team recommends, if your app contains three or fewer screens, you can go without DI. But with more than three screens, it’s always recommended to use DI.

One of the popular ways to implement DI in Android Apps is through the Dagger framework. But implementing Dagger requires a deep learning curve. One of the best alternatives is Koin, built natively on Kotlin.

If you’ve used Dagger or any DI library, you probably know the importance of scope. It enables us to determine if we’re getting the same dependent object or a new one. It also helps to release unnecessary resources and free up memory.

Scopes in Koin

Scope in Koin is similar to in Android, such as scoping a view-model to a particular activity and using it in the fragments inflated in that activity.

Out of the box, Koin has three kinds of scopes:

  • single:Create an object that persistent with the entire container lifetime (Similar to Singleton).

  • factory: Create a new object each time — no persistence in the container (can’t be shared).

  • scoped: Create an object that persistent tied to the associated scope lifetime.

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Single returns same instance each time, whereas factory returns new instance on every request.

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