Android Architectures

Brief introduction about widely used android architectures, their advantages and drawbacks.

Transcript

1. Architectures: • Classic Android (View Model) • MVC • MVP • MVVM • Clean and many more….
2. Goal! • Scalable (Large scale vision / new features) • Maintenance (Anyone can be able to understand and edit it) • Testing (easily testable)
3. Classic Android View: • Activity Data: • Database • Webservices
4. Pros: • Preferable for small apps Cons: • Activities and Fragments get bigger and bigger • Hard to understand for other developers • Unit testing is impossible • Implementing new feature takes lot of time Classic Android
5. Model View Controller (MVC) Model: • POJO classes • Business logic View: • Layout resources Controller: • Activity • Fragments • Adapters
6. Pros: • UI and business logic is not connected • Easier to unit test Cons: • Huge controllers • Violates Single Responsibility principles • Man in the middle (Controller) Model View Controller (MVC)
7. Model View Presenter (MVP) View: • Renders logic Presenter: • Handle User events and callbacks Model: • Database logic • REST Helpers
8. Pros: • Huge tasks split into simpler tasks • Smaller objects, less bugs • Easy to unit test Cons: • Model can’t be reused, tied to specific user case • Presenter mainly does the invoking and callback stuff Model View Presenter (MVP)
9. Clean Architecture Interactor
10. Pros: • Independent of Frameworks • Independent of UI • Independent of Java • Independent of Database Cons: • Lots of layers Clean Architecture
11. Model View ViewModel (MVVM) View: • Activity Model: • POJO classes ViewModel: • Interaction with model • Updating the View
12. Model View ViewModel (MVVM) • Microsoft pattern • Removes UI code from Activities / Fragments • Binding ViewModels to UI (Using databinding) • Easy unit tests • No ‘findViewById()’...............
13. XML Code sample <layout ...> <data> <variable .... /> </data> <TextView ...... android:visibility=”@{viewModel.hasValue ? View.VISIBLE : View.GONE}”> </TextView> </layout> GitHub sample: https://github.com/activesince93/MVVMDemo