Once I had gone through the starting tutorial, I followed along to try to get to the medals, this was my journey.
(Using coinAPI.IO, if you are curious)
Bronze Medal - Fetch data from API
Getting data! This was my output in console
`"time": "2021-04-09T17:21:17.0000000Z",
"asset": "USD",
"rate": 58129.784449564185964438276044,
"volume": 1006691938.9265092649750800000
},
{
"time": "2021-04-09T17:21:17.0000000Z",
"asset": "ETH",
"rate": 58122.310040699224159054898831,
"volume": 411765352.84316552267440165637
},
{
"time": "2021-04-09T17:21:17.0000000Z",
"asset": "BCH",
"rate": 58113.757733838815756287353973,
"volume": 25098215.853426955508618248687
}
]`
4 . New bug now
Exception has occurred.
_TypeError (type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'FutureOr<int>')
I had to update the return type to Future<dynamic>
in getCurrencyData
And
Make sure that the async
work is done outside of setState
void updateUI() async {
var coinData = await coin.getCoinExchangeRateForCurrency("BTC", "USD");
setState(() {
double doubleRate = coinData['rate'];
rate = doubleRate.toInt();
});
}
Silver Medal - Get pickers working
Cupertino picker - Set the initial index of the picker to USD
scrollController: FixedExtentScrollController(initialItem: 19),
I hardcoded the 19 for now (USD is the 19th item in the list). will change this to be dynamic later, but for now, this works.
Gold Medal - Fetch price for other cryptocurrencies
Add 3 more Text cards to include the value of all 3 cryptos in project. Bitcoin, Litecoin and Ethereum.
This will be a good place to keep DRY(don’t repeat yourself) in mind. Extract current card widget to create the 3 new ones . But lets not get ahead of ourselves for now, just focus on functionality
! - since we get all 3 cryptos with any call, I only need to create 2 additional variables to keep track of ethereum and litecoin and pass those to their Text widgets
Created
int ltcRate;
int ethRate;
It works!! Now - time to refactor
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