Decouple Android with Dagger and Otto

This repository contains the sample code that accompanies my CodeMash 2016 presentation on Dagger 2 and Otto.

Here are my slides

Dagger is a dependency injection framework for Android currently being maintained by Google.

Otto is an event bus for Android written by Square.

Screens

Non Dagger Sample

This sample illustrates creating a RetroFit API (StarWarsAPI), performing a GET request on "/films" and displaying the results in a RecyclerView.

Dagger Sample

This sample illustrates performs the same task as the Non Dagger Sample, but using Dagger 2 to inject the StarWarsAPI class.

This example also illustrates a dependent component, StarWarsFragmentComponent. This component depends on ApplicationComponent. I wanted to do this so I could show how you can sub-scope object graphs. When StarWarsFragmentComponent gets destroyed, the singleton object SearchResultAdapter will get cleaned up.

Otto Sample

This example demonstrates a fragment communicating with a retrofit. Upon a successful call to the getFilm api, retrofit will post the success event to the bus, which gets handled in the fragment. If there is a network error, the event gets handled by the Activity.

This sample also shows how you can use the DeadEvent class to debug when there are no subscribers for an event.

Building

To build, install and run a debug version, run this from the root of the project:

./gradlew assembleDebug

#Unit Tests

To run the unit tests for the application:

./gradlew testDebugUnitTest

References

Dagger

• https://google.github.io/dagger/

• Dagger 2: a new type of Dependency Injection

• Dagger 2: A tutorial

• https://github.com/konmik/konmik.github.io/wiki/Snorkeling-with-Dagger-2

• https://www.youtube.com/watch?v=JNbz_rgdQ10

• http://slidenerd.com/2015/09/11/android-dependency-injection-with-android-annotations-and-dagger-2/

• https://publicobject.com/2014/11/15/dagger-2-has-components/

• http://code.tutsplus.com/tutorials/dependency-injection-with-dagger-2-on-android--cms-23345

• https://www.reddit.com/r/androiddev/comments/38bcgw/need_a_good_tutorial_on_dagger_2/

• http://www.slideshare.net/pustovit/anton-minashkin-dagger-2-light?qid=ffca4d97-401c-4ada-9790-57f8a5eaf5d4&v=qf1&b=&from_search=1

• http://www.slideshare.net/GlobalLogicUkraine/dagger-2-by-anton-minashkin?related=2

• https://engineering.circle.com/instrumentation-testing-with-dagger-mockito-and-espresso/

• http://tech.just-eat.com/2015/10/26/dependency-injection-on-android/

• http://www.future-processing.pl/blog/dependency-injection-with-dagger-2/

• http://fernandocejas.com/2015/04/11/tasting-dagger-2-on-android

• http://konmik.github.io/snorkeling-with-dagger-2.html

• http://siphon9.net/loune/2015/04/dagger-2-0-android-migration-tips/

• http://blog.gouline.net/2015/05/04/dagger-2-even-sharper-less-square

  Code Examples

• https://github.com/mgrzechocinski/dagger2-example

• https://github.com/cgruber/u2020/tree/dagger2

• https://github.com/frogermcs/DaggerExample

Otto

• https://square.github.io/otto/
• Otto Event Bus in Android
• Episode 2: Otto Event Bus
• http://www.slideshare.net/petminuta/event-based-programming-45465844?qid=1d3b577f-387a-413d-9a0d-14aca5eaf759&v=default&b=&from_search=1
• https://guides.codepath.com/android/Communicating-with-an-Event-Bus
• RXAndroid vs EventBus
• https://www.reddit.com/r/androiddev/comments/2xsinq/reactive_programming_vs_event_bus/
• http://nerds.weddingpartyapp.com/tech/2014/12/24/implementing-an-event-bus-with-rxjava-rxbus/

Both Otto and Dagger

• http://www.infoq.com/presentations/Android-Design