Android-CleanArchitecture | sample app that is part of a series of blog posts | Architecture library

I am building an app based off of the Android Clean Architecture Kotlin version (https://github.com/android10/Android-CleanArchitecture-Kotlin).

Using this architecture, each time you want to invoke a use case, a Kotlin coroutine is launched and the result is posted in the main thread. This is achieved by this code:

I'm working in a mixed Java - Kotlin project. There's a class Either: https://github.com/android10/Android-CleanArchitecture-Kotlin/blob/master/app/src/main/kotlin/com/fernandocejas/sample/core/functional/Either.kt

In one of the Java classes I'm getting an instance of Either as a parameter in such a way:

I just start learn and apply CleanArchitecture for my Android project.
I see there are 2 great source for following here
1) https://github.com/android10/Android-CleanArchitecture
2) https://github.com/fiveagency/Reedly (https://five.agency/android-architecture-part-4-applying-clean-architecture-on-android-hands-on/)

Currently, the first source use the CompositeDisposable in domain (inside UseCase) and the second source use in presentation/app(Presenter/ViewModel)

As my current understand, I see the benefit when we put CompositeDisposable in Presenter/ViewModel.

• Easy to dispose (because if we CompositeDisposable in UseCase, for each UseCase we need to dispose call 1 time)
• May easy to combine many UseCase (eg: UseCase1 execute then flatMap/zip... with UseCase2)

I see the benefit when we put CompositeDisposable in UseCase

• It separate RX from presentation

I don't know if is there any other pros/cons of 2 approach. I never use CleanArchitecture for real project and I know when we follow any approach, it's quite hard to change to another approach.

For me, currently I think I will choose: put CompositeDisposable in UseCase. What should I use? Is there any other approach?
Any help or advice would be great appreciated.

So I was going through clean architecture in android, really liked it how people even create separate projects for domain, data and presentation layer. I tried to create my own project for clean architecture but couldn't set up different projects for domain, data and presentation layers.

How can I accomplish this kind of project architecture? https://github.com/android10/Android-CleanArchitecture

So I was following Clean Architecture to design my application. I have an Activity with a view pager which has two Fragment in it. Im injecting the PagerAdapter for this through Dagger.

I understand that calling setRetainInstance(true) on a fragment prevents it from getting destroyed, and that getActivity() on such fragment may return a problem if the Activity is destroyed. I'm getting a NullPointException when trying to resume my activity after it has been on background and the activity has been (presumably) destroyed.

So my question is

• Is there a better way to accomplish what I'm trying to do?
• Any resource someone can point me to?
• Also uncertain why the Fragment and the Adapter is still active if the fragment has been destroyed. I get no memory leaks with LeakCanary.

My activity has an Dagger Component MainActivityComponent which is injected as follows. And also extends HasComponent. For more info on this refer to HasComponent

MainActivity.java

I have a Android Clean Architecture project write in Kotlin with 3 modules:

• data (Android Library)
• domaine (Java Library)
• presentation (Android Application)

The 3 modules each have unit tests written with junit. But with Kotlin every class is final by default. I quickly had the problem: How to mock a final class with mockito

It's now possible with Mockito 2

It can be done via the mockito extension mechanism by creating the file /mockito-extensions/org.mockito.plugins.MockMaker containing a single line:

What´s the best approach when developing an Android app and trying to follow clean architecture guidelines (but not extremely strict - cause that may be overkill for smaller projects).

In my case, I am unsure which approach is the best (if there is a best one) regarding the data layer and if the data layer should operate on its own model classes or if it may operate directly on the domain layer models.

Also, if the data layer should operate on its own model classes, should data sources like DB or API have their own models (like for an API using Retrofit and Gson a model class with Gson annotations) and then map to data layer models OR should the data layer model itself be the model returned by DB and API (this means the data layer model must be annotated for Gson being able to parse it in case of Retrofit and Gson).

This is the case in this project: https://github.com/android10/Android-CleanArchitecture/blob/master/data/src/main/java/com/fernandocejas/android10/sample/data/entity/UserEntity.java

The following images should clarify the 3 approaches I mean:

In Image 1 the DB and API return specific model classes. In the case of the API it may look like (using Retrofit and Gson):

I have a project using this structure: https://github.com/android10/Android-CleanArchitecture, and I am trying to convert it to Kotlin.

The domain module compiles just fine, but when I try compile the data module I get the following error:

I have a ViewPager with two pages namely Popular and All. What I'm trying to achieve is only push items that have popular tag true to Popular whereas push all items to All.

Currently I have a single class which is used in the PagerAdapter and passing in the page type. How do I filter out PublishSubject so that each page only displays necessary items accordingly.

Both my Observer are subscribed to a single PublishSubject, but I want to filter when emitting.

Please comment if the question is unclear. I'll try my best to relay this problem. Also sorry if it has already been answered since I couldn't find anything relevant.

The code I'm using is this based on this architecture in which I have a Firebase data store FirebaseSubscriptionDataStore which provides the PublishSubject. This is later subscribed to by SubscribeToSubscriptionUpdates in SubscriptionListPresenterImpl

Thanks in advance.