Di with dagger2 in android
- 1. DAGGER SO SHARP! DEPENDENCY INJECTION IN ANDROID
- 2. TOPICS What is Dependency Injection What is Dagger Pros and Cons of Dagger Dagger alternatives Sample Implementation QA session
- 3. WHAT IS DEPENDENCY INJECTION? Dependency Injection (DI) is a design pattern used to implement Inversion of Control(IoC). It allows the creation of dependent objects outside of a class and provides those objects to a class through different ways. Using DI, we move the creation and binding of the dependent objects outside of the class that depends on them. It's a design pattern(No need for a library to implement) We all use some form of DI Car Engine Dependency Depends
- 5. HARD COUPLED EXAMPLE BadCar is tightly coupled to the fate of Engine and Wheels
- 6. BENEFITS OF DI LOOSE COUPLING EASY TO TEST CODE REUSABILITY
- 9. POPULAR LIBRARIES Dagger2 Koin Kodein Roboguice Butterknife Android annotation Toothpick
- 10. WEAPONS, MONEY AND DRUGS A SIDE BY SIDE COMPARISON OF DAGGER2, KOIN AND KODEIN
- 11. COMPARISON BETWEEN DAGGER2, KOIN & KODEIN Dagger 2 Koin Kodein Written in Java Written in kotlin Written in Kotlin(Java support) Generates code in build does not generate code(less build time) No code generation Has proxy classes No proxy classes No proxy classes Uses annotations No annotation No annotation A lot of boilerplate Less boilerplate
- 13. DAGGER2 Uses Directed Acyclic Graph = DAGger There are no cyclic dependencies @Module and @Provides: define classes and methods which provide dependencies @Inject: request dependencies. Can be used on a constructor, a field, or a method @Component: enable selected modules and used for performing dependency injection
- 14. LET'S ROLL UP OUR SLEEVES AND WRITE SOME CODE!
- 15. BENEFITS OF DAGGER2 Provides compile-time verification of the whole dependency graph so app doesn't crash at runtime Very clear error messages Designed for low-end devices
- 16. CONS OF DAGGER2 Too verbose Steep learning curve
- 18. THANK YOU THE END. THAT'S IT.
- 19. REFERENCES & FURTHER READING https://codinginflow.com/tutorials/android/dagger-2/part-1-introduction https://www.tutorialsteacher.com/ioc/dependency-injection https://android.jlelse.eu/fundamentals-of-dependency-injection-and- popular-libraries-in-android-c17cf48b5253 https://medium.com/@egek92/koin-di-comparison-of-android-dependency- injection-frameworks-236a6909bc3e https://dagger.dev/users-guide https://medium.com/@charbgr/bye-bye-dagger-1494118dcd41 https://www.journaldev.com/20654/android-mvp-dagger2-retrofit-rxjava https://android.jlelse.eu/7-steps-to-implement-dagger-2-in-android- dabc16715a3a https://www.vogella.com/tutorials/Dagger/article.html https://blog.mindorks.com/introduction-to-dagger-2-using-dependency- injection-in-android-part-2-b55857911bcd https://medium.com/@harivigneshjayapalan/dagger-2-for-android- beginners-introduction-be6580cb3edb https://www.youtube.com/watch?v=ZZ_qek0hGkM https://medium.com/dvt-engineering/android-dagger-2-isnt-hard- 97671ac15b07
- 20. DAGGERING NEVER STOP I HAD TO ADD THIS