In this **Koin Tutorial**, we’re going back to the foundations — setting up the **Dependency Injection (DI) layer** and configuring the **Application class** in an Android project using Kotlin. Koin is a lightweight and pragmatic DI framework designed specifically for Kotlin developers, making it an excellent choice for Android development.

This tutorial is perfect for those working with **MVVM architecture** or simply looking to introduce clean dependency management into their Android app. We’ll walk through every step of integrating Koin into your project — from adding dependencies to setting up your first Koin module and initializing the framework in the Application class.

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### What You'll Learn:

How to add Koin to your Android project
How to create your DI module(s)
How to structure the DI layer for scalability
How to initialize Koin in the Application class
Best practices for managing dependencies with Koin

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### Prerequisites:

- Android Studio setup with a Kotlin project
- Basic understanding of Android components
- Familiarity with MVVM (Model-View-ViewModel) is a plus

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### Step-by-Step Overview:

1. **Add Koin Dependencies to `build.gradle`:**
```kotlin
implementation "io.insert-koin:koin-android:3.5.3"
```

2. **Create Your DI Module(s):**
Organize your dependencies in a clean, scalable way:
```kotlin
val appModule = module {
single { NetworkClient() }
single { UserRepository(get()) }
viewModel { MainViewModel(get()) }
}
```

3. **Initialize Koin in Your Application Class:**
```kotlin
class MyApp : Application() {
override fun onCreate() {
super.onCreate()
startKoin {
androidContext(this@MyApp)
modules(appModule)
}
}
}
```

4. **Declare Application Class in Manifest:**
```xml
application
android:name=".MyApp"
...
/application
```

5. **Use Injected Dependencies Anywhere in the App:**
```kotlin
class MainActivity : AppCompatActivity() {
private val viewModel: MainViewModel by viewModel()
...
}
```

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### Best Practices:

- Split your DI modules by feature (e.g., `networkModule`, `repositoryModule`, `viewModelModule`) for large projects.
- Use `single` for shared instances and `factory` for new instances on each injection.
- Keep initialization logic minimal in the Application class — just start Koin and load modules.

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Get started with **clean architecture** and scalable code using Koin!

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