What is the main role of Dagger Hilt and why is it used in Android app development?

Dagger Hilt is a dependency injection library for Android applications built on top of Dagger 2. It simplifies and standardizes the process of creating and managing dependencies.

Main roles of Hilt:

• Automate the creation and provision of objects (e.g., ViewModels, repositories, services) without manually writing factories or singletons.
• Provide a lifecycle for dependencies associated with Android components (Activity, Fragment, Service, etc.).
• Reduce boilerplate code and errors related to dependency management.

Why use it:

• Simplifies app architecture and improves testability.
• Allows easy replacement of implementations for testing.
• Integrates with Android Jetpack and other libraries.

Example usage:

@HiltAndroidApp
public class MyApp extends Application {}

@AndroidEntryPoint
public class MainActivity extends AppCompatActivity {
    @Inject MyRepository repository;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // repository is already injected and ready to use
    }
}