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MVVM Pattern:

• ViewModel: Design your ViewModel to hold and manage UI-related data in a lifecycle-conscious way. It should be responsible for making calls to the Repository layer and handling any business logic.
• Repository Layer: This layer will interact with your web service API. It acts as a mediator between the ViewModel and the data source (your backend).

LiveData or StateFlow:

• Decide whether to use LiveData or Kotlin's StateFlow to handle data observability and UI state management. StateFlow is a newer API that is fully integrated with Kotlin's coroutines.

Dependency Injection:

• Consider using a dependency injection framework like Hilt or Koin for better scalability and testability.

Navigation:

• Plan how navigation will be handled in your app. With Jetpack Compose, you can use the NavController for managing composable screens.

Data Models:

• Define data models corresponding to your web service's data structure for users, transactions, fund sources, etc.

Handling State:

• Determine how to handle and store the UI state effectively, especially for complex UIs or data-driven screens.

Login UI:

• Design a composable function for the login screen, ensuring it aligns with your app’s aesthetic.
• Include input fields for username/email and password, and a button to submit the login request.

Integration with Backend:

• Use Retrofit or another HTTP client to make requests to your web service for authentication.
• Handle the reception of JWT tokens and securely store them, possibly using encrypted shared preferences.

Secure Storage:

• Store the received JWT tokens securely. You can use Android’s EncryptedSharedPreferences or a secure library like Hawk.

Error Handling:

• Implement error handling for scenarios like invalid credentials or network issues.

Navigation upon Login:

• Upon successful login, navigate the user to the main screen of the app using the NavController.

Signup and Password Recovery:

• Optionally, if your API supports it, include signup and password recovery options.

ViewModel for Authentication:

• Implement a ViewModel for handling authentication logic and maintaining authentication state.