add HOW-IT-WORKS.md

antoniolg · Jan 9, 2016 · 29e9936 · 29e9936
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diff --git a/HOW-IT-WORKS.md b/HOW-IT-WORKS.md
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+How it Works
+==========
+![](login-classes.png)
+
+1. View(Activity, Fragment, ...) calls presenter methods whenever there're user interaction
+2. Presenter implementation calls the interactor(use case handler) to get results from business/domain layer
+3. Interactor implementation returns the results or just returns the control to presenter implementation by calling listener methods
+4. Presenter implementation calls view methods to update the UI by calling view interface.
+
+View, Presenter, Interactor and Listener interfaces are used to remove tight coupling.
+
+View becomes too humble to test. We can use fake(simulator) presenter to test view.
+
+Presenter and Interactor can be tested.
diff --git a/login-classes.png b/login-classes.png