Jetpack Compose Academy · Lesson

Why DI: Testable, Decoupled Code

See the problems Hilt solves.

What Is Dependency Injection?

Dependency injection means a class receives the objects it needs from the outside, instead of building them itself. Less wiring, more focus. 🔌

When a class calls new on its own dependencies, it gets locked to those exact types. Changing one thing forces you to edit many files.

class Repo {
    private val api = ApiService() // hard-wired
}