Kyptonite
This Android App fetches the Exchange Rates between different currencies using https://currencylayer.com/documentation.
Key features
- User can select the desired currency for which the exchange rates are required.
- User can enter the amount that need to be converted to a different currency.
- The available/supported currencies are only fetched from the remote server first time the app is opened and persisted locally.
- The exchange rates between currencies are refreshed after atleast 30 mins and persisted locally.
- The App uses MVVM architectural design pattern. The architectural layers are shown below:
| Activities | Fragments |
|---|
| ViewModel |
| UseCases |
| Repository |
| AppDatabase | CurrencyApi |
- Few unit tests to ensure correct functioning of the Repository.
- A currency not supported/available by the API like SSD, are supported by local conversion.
- Instead of storing it's exchange rate for every currency, it's exchange rate with USD is kept and the rest of the exchange rates are calculated recursively.
Silver linings
- Supports landscape screen orientation.
- Supports multi-window.
- Multi-item recycler view adapter, which uses custom written annotation processor to generate viewholders.
How to run
- Clone the repository.
- Import the project in Android Studio. (May require Android Studio 4.0 - Preview as the project was built using that)
- Add
currency_layer_access_key=in local.properties file. - Run the App.
Download APK
Screenshots
