Author: Hristo M. Stefanov
This Android app is a demo and is not intended for actual use. It demos using a banking REST API to implement a "Round up" feature with Kotlin coroutines and Jetpack Architecture Components.
It can be run against the Starling Bank's API sandbox environment using
the sandbox build variant or against an embedded mock service by
using the debug build variant (the default).
When you start the app, the first screen asks for an access token.
For the mock service (debug build variant) you can provide any string.
For a sandbox customer get it from (here).
On the next screen you can select an account and transfer the calculated Round Up amount for a week to a Savings Goal. The app provides a function for creating new Savings Goals.
NOTE: The Starling API sandbox provides Auto-simulator for auto populating customer's
history with different transactions.
It's best to open the project by using the File > New > Import project command.
If the build process fails, try:
- File > Sync project with gradle files
- Build > Rebuild Project
- File > Invalidate caches / Restart
The project includes various types of tests:
- BDD-style acceptance tests (EncourageUsersToSaveMoney.feature and RoundUp.feature)
- Unit tests for business logic (CalcRoundUpInteractorTest)
- Unit tests for view models (AccountsViewModelTest and CreateSavingsGoalViewModelTest)
- UI unit tests (CreateSavingsGoalFragmentTest)
The author aims to follow the ideas in the "Clean architecture" book by Robert C. Martin.
Architectural decisions for patterns and techniques:
- MVVM with data-binding
- Single activity app
- Coroutines and Flow
- Dependency injection (Dagger 2)
- EventBus for local broadcasting