Dependency Injection Mastery

Assisted injection in Hilt allows ViewModels to receive both injected dependencies and runtime parameters by annotating the constructor with @AssistedInject and marking runtime parameters with @Assisted, enabling dynamic value resolution while maintaining standard DI.

Multi-binding in Hilt is a pattern that collects objects from multiple modules into a shared collection or map. You need it for plugin architectures to discover and inject new processors, like a payment gateway, alongside existing ones without modifying core application logic.

Use Hilt qualifiers by annotating provider and injection sites with custom @Qualifier annotations to disambiguate dependencies, explicitly declaring which specific implementation the DI graph should resolve when multiple providers share the same type.

Organize Hilt modules for multi-module projects by aligning DI boundaries with modularization, using custom scopes to limit component lifecycles. This modular DI approach separates feature-specific bindings from core logic, ensuring a scalable and maintainable architecture.

Yes, Hilt supports custom scopes to limit component lifecycles in modularized apps. By defining custom scope annotations, you can restrict dependency instantiation to specific components, preventing memory leaks and ensuring dependencies only live as long as needed.

Integrate a new payment gateway without modifying core logic by leveraging Hilt multi-binding. This technique allows the new processor module to be discovered and injected alongside existing ones via a shared collection, decoupling the addition from the main payment flow.