MVP on Android: why do you need it?

Transcript

1. MVP: why do you need it? @stan_kocken

2. Join our team! dashlane.com/jobs Never forget another password Editor Choice

   Top Developer 4.5/5 - 1M+ downloads

3. MVP: why do you need it?

4. Activity

5. BaseActivity: 1600+ lines A base activity that handles common functionality

   in the app. This includes the navigation drawer, login and authentication, Action Bar tweaks, amongst others.

6. God Object

7. Activity

8. Activity/Fragments Usually contain: - actions on View - handle clicks

   - read/write in database / SharePreference - network calls - …

9. Activity/Fragments Very hard to: - read - test - refactor

   - reuse code - …

10. Separation of Concerns

11. Architecture MVP Model View Presenter state-change events updates view update

    model user events

12. Architecture MVP: in Android, my way Model View Presenter

13. Architecture MVP: in Android, my way Model: access data store

    state View Presenter

14. Architecture MVP: in Android, my way Model: access data store

    state View Presenter: present data to UI

15. Architecture MVP: in Android, my way Model: access data store

    state View: touch Android View no business logic Presenter: present data to UI

16. Architecture MVP: in Android, my way View: touch Android View

    no business logic Presenter: present data to UI Model: DataProvider access data store state

17. Architecture MVP: in Android, my way Model: DataProvider access data

    store state View: ViewProxy touch Android View no business logic Presenter: present data to UI

18. Presenter DataProvider ViewProxy Activity View Strong Reference Weak Reference Other

    “Strong” Reference on DataProvider, Presenter or ViewProxy forbidden. Use WeakReference. Architecture MVP: in Android, my way

19. Example

20. DataProvider Presenter ViewProxy Creation refreshBoard() getGameBoard() setBoxValue( int x, int

    y, int boxType);

21. DataProvider Presenter ViewProxy User click box onSelectBox(int x, int y)

    play(int x, int y) refreshBoard() …

22. Definition public interface BoardDef {
 
 interface IPresenter extends BaseDef.IPresenter

    {
 
 void refreshBoard();
 
 void onSelectBox(int x, int y);
 }
 
 interface IDataProvider extends BaseDef.IDataProvider {
 
 GameBoard getGameBoard();
 
 void play(int x, int y);
 }
 
 interface IView extends BaseDef.IView {
 
 void setBoxValue(int x, int y, int boxType);
 }
 }

23. Test the UI Android stuffs TextView ImageView … View Proxy

    Already Tested by framework team

24. Test the UI View Proxy Mock Mock Mock

25. @stan_kocken Presentation pattern: github.com/StanKocken/Presentation TicTacToe Example: github.com/StanKocken/TicTacToe