Adyen Android Assignment

• Git link: https://github.com/shahwaiz90/adyen-nearbyplaces

YouTube Video Demo

1. Tasks Completed

• When you click on the Find near by places chip, it will show near by places from the current position of the map.
• Handled Configuration Change. (Check with Landscape & Portrait Mode). To support more devices
• Permission Handling (Location Permission and LocationServicesEnabled Permission). To achieve accurate results
• Added animations on the List and Chip View (near by places). To improve UX
• Added a separate module for Network APIs. To achieve modularization and reusablity
• Test cases for View (viewmodel), Data (Api, Repo), Domain (interactor) layers
• Test cases for CashRegister Module.

2. Tech Stack

• Implemented Architecture MVVM + Clean architecture + SOLID principles. For separation of concerns and easier unit testing.
• Dependency Injection: HILT. To achieve dependency injection concept in the SOLID principles
• Coroutines. To achieve simplification in API requests and making less load on the memory
• LocationServices: FusedLocationProviderClient. To avoid draining the battery
• Interface implementation To communicate efficiently, mostly from adapter to activity click events.

3. CashRegister Logic in processTransaction (Summary)

• If product price is greater than amount paid then we throw exception, if not then go to step 2.
• We reverse the list.
• We start from the end of the list, untill payBackAmount(amountPaid - productPrice) is minimum.
• We check the count of the current bill/coin.
  • If count is more than 1, then we make keep on subtracting those amounts until we get amount equal to payBackAmount or less.
  • If count is not more than 1, then we just subtract it go to the next index.
• Then we keep on subtracting the amount untill we get payBackAmount or less.
• If the amount is equal to payBackAmount we return the change, otherwise we throw exception that change is not available.
• I think it can be improved if we start from center and apply binary search on it.

4. Demo Screenshots

1 - CashRegister test cases

2 - Showing Near By Places

3 - Showing Current Location

4 - Asking to enable location services

5 - Requesting Camera Permissions

6 - Test cases for view, data, domain layers