Hilt simplifies dependency injection in Android apps using Dagger under the hood. Add Hilt dependencies and apply the Gradle plugin. Annotate Application class with @HiltAndroidApp. AndroidEntryPoint makes activities and fragments injectable. @Inject constructor tells Hilt how to provide dependencies. @Module defines dependency providers for classes you don’t own. @InstallIn specifies which Hilt component installs the module. @Binds provides interfaces, @Provides provides instances from modules. Scopes like @Singleton control dependency lifecycle. @ViewModelInject provides dependencies to ViewModels with Hilt. @EntryPoint accesses injected dependencies from non-Hilt classes. Hilt replaces manual Dagger setup with automatic component generation. Component hierarchy follows Android lifecycle: SingletonComponent, ActivityComponent, FragmentComponent. with Hilt uses @HiltAndroidTest annotation and HiltTestRunner. Hilt improves testability by making dependencies explicit. Build time validation catches dependency errors early. Learning curve is gentler than raw Dagger. Hilt is the recommended DI solution for Android apps. It reduces boilerplate while maintaining Dagger’s compile-time safety.
