适配器，服务，内容提供商和其他基本元素在android应用的MVP架构中扮演什么角色？

Question

I figure out that it's very useful to use MVP pattern in my apps, but it's too complicated for me, how find out of role elements in apps, which is model, view, presenter?

1. What is adapter of recyclerview? I guess it should be a view, but it manage loading data to recyclerview, so it can be also presenter or model
2. How many presenters can have view? What is basic? For one view should be one present and one model? But if I have some view and can they use one presenter?
3. I have an app with recyclerview which is loading images from rest api. I wanna figure out elements for MVP. Activity with recycler view is View? Adapter is Presenter? Picasso is Model? Retrofit is Model? Notification Service for download in external storage is Model? Image class is Model?
4. Can you please give a link for big complex apps with MVP architecture, please?

Answer 1

There's no agreed definition on exactly the best way of MVP-ing in Android.

My answers to your questions.

1. I'd say the Adapter is a View, that is passed data from a Presenter .
2. I usually have 1 Presenter 1 View.
3. View : RecyclerView, Actvity, Fragment + Adpater all are views for me. Presenter: Is a normal java class that retrieves the data from Model (Retrofit, Sqlite, ContentProvider) and gives it the View to populate the RecyclerView.

See this article on MVP

Note :

• Try to ensure the Presenter does not have any Android logic or Android stuff.

• Model doesn't just mean the POJO's it can mean include storing in DB, ContentProvider etc. including network retrieval.

• The View should not interact with the model directly ie data retrieval, storage etc. Only via the Presenter.