The app works as shown in figure below, We can divied the app into two main parts are backend and frontend.
- The backend is Public API from Weatherbit it gives a forcast of status weather for 7 days as a JSON struct.
- The frontend built by Flutter, it's work by requesteing for public API (Weatherbit ), after that will display it.
As mentioned before, we used Flutter framework for frontend, for information about this framework and go to this link
We used the provider as state management of app
class WeatherViewModel extends ChangeNotifier {
Future<void> getCity() async {....}
void saveCity() async {...}
void fetchWeatherData() async {
...
try {
var url = Uri.parse('https://api.weatherbit.io/.....');
response = await http.get(url,);
var json = jsonDecode(response.body);
curDay = WeatherAPI.fromJson(json);
...
}
...
notifyListeners();}}
This code above is model for featch data from the server. Also it's extend from ChangeNotifier, this class will be notify any widget subscribe to any function in this class, if any change happen in theses funcations and will reload state of widget. For example, if i call fetchWeatherData() function then all widgets that subscribe to this function will be reloaded
body: RefreshIndicator(
key: refreshKey,
onRefresh: () async {
context.read<WeatherViewModel>().fetchWeatherData();
},
child:[....]
)`
So any widgets in child will be reloaded.
1-first run
2-first fetch data from server
3-loaded data and display it
4-change city
5-reloading only widgets subscribe to our model
5-if not there nay connection to internet
