MVP on Android: why do you need it?

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