Dagger 2: Dependency Injection in Android

Dagger 2: Dependency Injection in Android

Riyas Pullur Riyas Pullur

Riyas Pullur

Android Engineer @ YOÜGotaGift | Jetpack Compose | Flutter Developer | Kotlin | KMM (Kotlin Multi Platform) | Clean Architecture | GraphQL | REST | MVVM | JUnit | Leak Canary | Lottie Animation | Firebase

Published May 8, 2025
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What Is Dagger 2 (Deep Definition)?

Dagger 2 is a fully static, compile-time dependency injection framework for Java and Android. It’s designed to generate code for injecting dependencies efficiently, without reflection, and with strong type safety.

Unlike reflection-based DI frameworks (like Guice or Spring), Dagger 2 works by generating source code for your dependency graph, making it:

  • Extremely performant

  • Fail-fast (errors are caught during compilation)

  • Easy to debug (generated code is readable)

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