What is Dagger 2 in Android SDK?

Dagger 2 is a fully static, compile-time dependency injection framework for Java and Android. It's designed to make your code less complex and more modular by reducing boilerplate code for dependency management. Dagger 2 is widely used in Android development to facilitate dependency injection, improving the overall architecture of applications by allowing for more easily testable and maintainable code.

Dependency injection involves providing a class with its dependencies instead of the class creating them itself. This approach leads to more flexible code because it allows you to change the dependencies without modifying the codebase. Dagger 2 generates the necessary code for managing the dependencies, ensuring they are provided where needed while optimizing for efficiency.

Here’s a simple example of how to set up Dagger 2 in an Android project:

// Module to provide dependencies @Module class NetworkModule { @Provides fun provideRetrofit(): Retrofit { return Retrofit.Builder() .baseUrl("https://api.example.com") .build() } } // Component to inject dependencies @Component(modules = [NetworkModule::class]) interface AppComponent { fun inject(myActivity: MyActivity) } // Usage in an Activity class MyActivity : AppCompatActivity() { @Inject lateinit var retrofit: Retrofit override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) DaggerAppComponent.create().inject(this) } }

Dagger 2 Dependency Injection Android Development Android SDK Modular Code

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