Use cases / Interactors in Android Kotlin - Build, Publish & Deploy

Build & Publish - Use cases / Interactors

Performance Impact

Use cases or interactors organize business logic in your app. They help keep UI code clean and focused. Proper use of interactors can improve app responsiveness by separating heavy tasks from the main thread. However, if interactors perform long operations on the main thread, it can cause UI jank and dropped frames below 60fps. Efficient use of coroutines or background threads in interactors helps maintain smooth animations and reduces battery drain.

Optimization Tips

To keep your app running at 60fps, ensure interactors run heavy tasks off the main thread using Kotlin coroutines with Dispatchers.IO or Dispatchers.Default. Avoid blocking calls in interactors. Cache results when possible to reduce repeated work. Use dependency injection to provide interactors efficiently and avoid unnecessary object creation. Profiling with Android Studio's CPU and memory tools helps identify bottlenecks in interactors.

App Size and Startup Time

Use cases themselves add minimal size to your app since they are mostly Kotlin classes. However, adding many dependencies or large libraries to support interactors can increase APK size. Keep dependencies lean and modular. Lazy initialization of interactors can improve startup time by delaying work until needed. Avoid loading large data sets in interactors during app launch.

iOS vs Android Differences

On Android, interactors are often implemented as Kotlin classes using coroutines for async work. On iOS, similar patterns use Swift classes or structs with async/await or Combine. Android requires careful thread management with coroutines, while iOS uses Grand Central Dispatch or Swift concurrency. Both platforms benefit from separating business logic from UI, but implementation details differ due to language and framework differences.

Store Review Guidelines

Use cases do not directly affect store guidelines, but indirectly they help maintain app stability and performance, which are critical for approval. Google Play and Apple App Store require apps to be responsive and not freeze or crash. Efficient interactors help meet these requirements. Also, avoid excessive background work in interactors that could drain battery or violate background execution limits.

Self-Check Question

Your app takes 5 seconds to load this screen. What's likely wrong?

• Interactor is performing heavy work on the main thread, blocking UI rendering.
• Interactor is loading large data synchronously instead of asynchronously.
• Interactor is not caching data, causing repeated expensive operations.
• Interactor initialization is done eagerly at startup instead of lazily.

Key Result

Use cases (interactors) improve app structure and performance by separating business logic from UI. Proper async handling with Kotlin coroutines ensures smooth 60fps UI and efficient battery use. Keep dependencies minimal to reduce app size and startup time. Android and iOS differ in concurrency models but share the goal of clean logic separation.