Flutter 肘不变 state

Question

I'm studying bloc in Flutter now and faced a problem.

In my test app I fetch weather data and when trying to display it I see no changes and no errors.

The trouble is: I do get the data and can see with print, but when it comes to displaying with BlocBuilder, it seems to not change the state.

This is the link to my repo - https://github.com/PhilippBekher/flutter_weather

The logics for displaying data are in main.dart The weather data is accessible via the link - https://api.weatherapi.com/v1/forecast.json?key=%20f148ee51b7cd4e2390e110556221408&q=London&days=1

When trying to print the state inside the file for the cubit, I can't see the emitted state (WeatherFetchLoaded): The screen below:

Answer 1

I ran your code. Here is the outcome

It came in is catch block line.Here you are emitting no value. So only Its still in loading state.

 Future<void> fetchWeatherApi() async {
    emit(WeatherFetchLoading());

    try {
      final Weather weather = await apiRepository.getWeather();
      print('hello');

      emit(WeatherFetchLoaded(weather: weather));
    } on Failure catch (err) {
      emit(WeatherFetchError(failure: err));
    } catch (err) {
      print("Error 1: $err");  **// Here** 
    }
  }

It shows

'double' is not a subtype of type 'int'

This is a parsing issue while converting to the values to double. Your approach of parsing json is not a recommended way. You can read here more about json parsing. If you need to continue to debug,it may be time consuming to find exact field. You can try looking on each field. You need to make sure you are parsing correct data type. Model class and json should have same data type.