RetrofitMVVM

This is an Android application that displays a list of users retrieved from an API. The app uses the Model-View-ViewModel (MVVM) architecture, Retrofit for networking, and Kotlin Coroutines for asynchronous programming.

Installation

1. Clone the repository using git clone https://github.com/<username>/UserListApp.git
2. Open the project in Android Studio
3. Build the project using Build > Make Project
4. Run the app on an emulator or physical device using Run > Run 'app'

Dependencies

The app has the following dependencies:

• Retrofit: For networking
• Kotlin Coroutines: For asynchronous programming
• Coil: For image loading and caching
• RecyclerView: For displaying the list of users
• ViewModel: For implementing the ViewModel layer of the MVVM architecture
• LiveData: For handling data updates in the ViewModel layer
• Navigation: For navigating between screens in the app

Usage

When the app is launched, it fetches a list of users from the API and displays them in a RecyclerView. Each item in the list displays the user's name, email, and profile picture. Clicking on an item expands it to show the user's salary.

The app has a refresh button that allows the user to refresh the list of users. If there is an error while fetching the users, an error message is displayed on the screen.

Architecture

The app uses the MVVM architecture to separate concerns and make the code more testable and maintainable. The three layers of the architecture are:

• Model: The model layer contains the data and business logic of the app. In this app, the model layer consists of the User data class and the UserService class, which fetches the list of users from the API using Retrofit.
• View: The view layer contains the UI elements of the app. In this app, the view layer is implemented using the MainActivity and the UserListAdapter.
• ViewModel: The ViewModel layer acts as the mediator between the model and view layers. In this app, the ViewModel layer is implemented using the ListViewModel, which fetches the list of users from the UserService and exposes the list of users to the view layer using LiveData.

Conclusion

This app demonstrates the use of the MVVM architecture, Retrofit, Kotlin Coroutines, and other Android libraries in building a simple yet functional Android app.