hgarciaalberto/waracletest

Waracle Test: Cake App

Cake App

I have spent a little more time due to the fact that I wanted to implement several features that are considered very important nowadays. Commits have been bare and plain so I would like to explain what I've done here in detail:

1. Dependency Injection

A basic architecture using Dagger was the first step. Due to the application size and complexity, it wasn't needed to implement subcomponents but I kept different logic separated using modules.

2. Network communication

Secondly, I've used Retrofit as well as Coroutines to retrieve data Cakes. In addition, I've separate data structure retrieved from network CakeScheme and data from business logic inside the app Cake. In bigger project, this separation is fundamental in order to avoid future problems.

3. Design-Patter MVVM

To continue, I've implemented MVVM (Model-View-ViewModel) design pattern and I've also used a ReciclerView Adapter with CardView component to show the data instead of a basic ListView. At this point I've use DataBinding not only to manage the UI components but also in Viewholder inside the ReciclerView too. This could be a bit tricky but it's very handy. Furthermore, images have been displayed using Glide library and using also @BindingAdapter("imageUrlAdapter") to link the xml tag app:imageUrlAdapter="@{modelCake.image}"

4. Several improvements

After finishing the hardest staffs, I focussed on small features like:

• Menu item in MainActivity to refresh the cake list
• Added DialogFragment to show item details. In order to use animations, I've done two of them: fade in/out and slide button/up . Them show up randomly when clicking the items in the RecyclerView.
• Show a Snackbar with an error message when the list cannot be loaded. It also allows the user to refresh the list.
• Remove duplicates entries and sort them. In this case I use an extension function in charge of processing the list when it is retrieved: fun <T> ArrayList<T>.processList(){...}

5. Testing

I've create both test, Unit Test and Instrumental Test. I've achieve 100% of coverage in the ViewModel class which has the main logic. It only has the method to retrieve data from service.

6. Libraries

• retrofit
• coroutines
• glide
• mockito
• espresso
• truth