The application has a very basic UI. No work has been done on the design due to shortage of time and a lesser creative mind. The app has the following structure.

• activity
  • MainActivity (Base class for handling common functionality for all Activities)
• adapter
  • GenericAdapter (Adapter class for handling data)
  • CustomBindingAdapter (Binding Adapter class for handling ImageView src)
• utils
  • NetworkRequestUtil (Handled all the network operations here)
• viewmodel
  • MainActivityViewModel (ViewModel of the MainActivity)
  • PhotoData (Model for Flickr Photo Object)

• Improve Image Caching Library to use local cache and avoid external storage.
• Use Serialization/Deserialization libraries to avoid writing long parser classes.
• Handle error codes with Api class and send meaningful callbacks.
• Improve Design to make it more fluid and follow Material Guidelines.
• Write UI and Unit Test cases. (Will need use of Third Party Libraries, hence avoided)
• Need to update Proguard for code obfuscation.
• Refactor code to follow a Clean Architecture guideline and improve usage of interfaces and dependency injection to avoid tight coupling between classes.