Clean Architecture on Android: Structure your app professionally
Learn how to separate your responsibilities into separate Presentation, Domain, and Data layers in Kotlin.
In FenixDevApp, we know that a disorganized application becomes unsustainable in the medium term. **Clean Architecture** is the gold standard for creating applications that are scalable, readable, and easy to test in an automated way.
1. Domain Layer (The Heart of your App)
It exclusively contains the business rules of your application (Use Cases*) and entities. It is 100% pure language code (Kotlin) and should not depend on the Android framework, databases or network libraries, facilitating its reuse and business testing.
2. Data Layer (Data)
Responsible for providing data to the domain layer. It implements the Repository pattern, coordinating local databases (such as Room), network REST APIs (Retrofit / Ktor) and cache. Master abstraction through interfaces.
3. Presentation Layer (UI)
The front-end of your mobile app. Observe the state exposed by ViewModels and render interactive screens using Jetpack Compose. Its only responsibility is to react to state changes and interact with the end user.
Maintainability and Robustness Above All
Although it requires writing more files initially, Clean Architecture saves hundreds of hours in debugging and future refactoring. It is an essential investment for the success of your applications.
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