Getting Started with Dagger 2

Fast dependency injection for Android applications.

Check my samples out:
https://github.com/rodrigohenriques/android-mvp-clean-architecture
https://github.com/rodrigohenriques/Dagger-2-Sample

Linkedin: https://br.linkedin.com/in/henriquesrodrigo

Transcript

1. Getting Started with Dagger 2 Fast dependency injection for Android applications
2. Why dependency injection? Separation of concerns Testability Every app has some kind of dependency injection
3. Uncle Bob “Depend upon Abstractions. Do not depend upon concretions.”
4. A brief history of time JSR-330 Guice Dagger
6. Dagger 2 Maintained by Java Core Libraries team at Google Faster than Guice and Dagger Easy to use and to debug Mobile first
8. Dagger API @Modules + @Provides @Inject @Component
9. Providing Dependencies
10. Requesting Dependencies @Inject annotations required Constructor, Field & Method
11. Constructor Injection @Inject on a single constructor Parameters are dependencies They can be stored in private and final fields
12. Constructor Injection
13. Constructor Injection It’s useless now
14. Constructor Injection
15. Dependency Graph EpisodeRepository DataModule#provideEpisodeRepository RemoteEpisodeRepository TraktvApi DataModule#provideTraktvApi OmdbApi DataModule#provideOmdbApi Constructor Injection
16. Field Injection @Inject on fields for dependencies Field can not be private or final Inject happens after object is fully instantiated Object is usually responsible for injection
17. Method Injection
19. http://google.github.io/dagger/
20. Components Bridge between modules and injections The injector
21. Components
22. Components this notation is optional
23. Components
24. Components
25. How about some live coding?
26. github.com/google/dagger
27. Questions?
28. Questions? github.com/rodrigohenriques