android Clean Code Mohanraj Karatadipalayam @kmmraj 

Let's Start With Unit Testing • Typical Activity Class • Data retrieval • Data manipulation and decoration • UI-specific activities like rendering, painting, responding to user events, and the creation of fragments. • One class does all work • Massive Activity, Massive Fragment, Massive ViewController 

Can I Test them ? • Lets take data retrieval • All methods are intertwined • Doing everything everywhere • I need API provider • I need SQLite • I need to convert from datamodel to viewmodel • Mocking cannot rescue 

Does your App Architecture supports unit testing ? • Search for the testing tools • Forgetting the need 

Where to start ? • Clean architecture • VIPER • Force fitting in to Android • clean-swift 

Android Clean Code 

Lets spilt the Monolithic Activity • Retrieve the data • Modify the model data according to viewmodel needs • Handle UI specific work • How they talk to each other ? • Interfaces • Unidirectional Flow 

Activity 

Activity Unit Testing • Using Roboletric to simulate the Activity • Canary test • How do we test the Activity without Interactor? 

Activity Unit Testing 

Activity Unit Testing 

Interactor • Interactor retrieves the data from data sources like the local DB, web service, and content provider. 

Why we need Worker ? • If the task is simpler- No need • If you foresee that the task can be reused somewhere else in the app, move it to the Worker. 

Testing Interactor • How to test Interactor with out Worker & Presenter 

Testing Interactor 

Presenter • Reduce the Model to VM 

Presenter 

Testing Presenter • FIRST • Fast • Isolated • Repeatable • Self-Validating • Timely 

Router • Determines the next screen • Pass the needed data to the next screen 

Testing Router 

Configurator 

Scaffolding 

What’s next? • Predictability • Developers can work across the technologies • Contribute • Refine