Crypto Coins

Easy to use app which just shows list of cryptocurrencies, their present market values along with their Candle Chart. I have used CoinMarketCap API as datasource for this application. You can bookmark some currencies to watchlist which appear on the Watchlist screen.

App Compatibility

Android device running with Android OS 6.0 (API Level 23) or above. Designed for Phones and NOT for Tablets.

Rubric followed for the Project

• App queries the coinmarketcap.com API to fetch cryptocurrencies and properly parses the JSON Response.
• Each List item displayed by the App for the crypto currencies should contain relevant text and information about the currency.
• This includes -
  • Current Market value.
  • Candle chart for different time periods.
  • Increase/Decrease in rate percentage.
• Networking operations are handled by Retrofit library.
• Clicking on cryptocurrency redirects to details page.
• On device rotation -
  • The layout remains scrollable.
  • The app saves state and restores the list back to the previously scrolled position.
  • The UI properly adjusts so that all contents of each list item is still visible and not truncated/overlapped.
• When new cryptocurrency data is fetched, the main screen properly updates the new data.
• Check whether connected to internet or not. Also, validate for any occurrence of bad server response or lack of response.

Things explored/developed in addition to the above defined Rubric

• This app fetches data once from API using Retrofit and caches it using Room. The watchlist is stored in SharedPreferences as list of IDs. It uses Paging Libaray for loading data from database in discrete manner and UI is bound with data using DataBinding.
• Used RecyclerView in place of ListView (to display the cryptocurrencies) for its advantages in performance and easy placeholders for custom item decoration.
• CardView for displaying the cryptocurrency content for each cryptocurrency item.
• Components used:
  • Lifecycle - Used by LiveData.
  • LiveData - For observing upon data in ViewModel.
  • ViewModel - For managing UI data.
  • Room - For persisting data.
  • Paging- For loading long list or infinite data in RecyclerView
  • Navigation - For simplifying navigation using Fragment.
  • WorkManager - For running repeated background Work.
  • DataBinding - For binding data with views in layout.
• List of libraries used:
  • Retrofit : For handling HTTP request and responses.
  • Glide : Image Loader library.
  • Room : For more robust database access.
  • Navigation Component : Navigating between destinations.
  • Picasso - For loading images into ImageView.
  • Gson - For converting JSON to POJO and vice versa.

Design

Home Page	Details Page	Market Page	Watchlist

Install

• Download the app
• Make sure to turn on the Data network before using the app.