CODEWITHSUNDEEP
flutter
Jimmyjbk
Jimmyjbk

Reputation: 401

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

I am still learning flutter and I came throuygh a very weird error and still not getting why I have it. Here is my file

class _LocationScreenState extends State<LocationScreen> {
  WeatherModel weather = WeatherModel();
  int temperature;
  String weatherIcon;
  String cityName;
  String weatherMessage;

  @override
  void initState() {
    super.initState();
    updateUI(widget.locationWeather);
  }

  void updateUI(dynamic weatherData) {
    setState(() {
      if (weatherData == null) {
        temperature = 0;
        weatherIcon = 'Error';
        weatherMessage = 'Unable to get weather data';
        cityName = '';
        return;
      }
      double temp = weatherData['main']['temp'];
      temperature = temp.toInt();
      var condition = weatherData['weather'][0]['id'];
      weatherIcon = weather.getWeatherIcon(condition);
      weatherMessage = weather.getMessage(temperature);
      cityName = weatherData['name'];
    });
  }

The error is

type int is not a subtype of type double

I would like to understand why I am getting this error.

Upvotes: 1

Views: 620

Answers (2)

Pedro Massango
Pedro Massango

Reputation: 5005

This error happens when you try to pass a value of type int into a variable of type double.

Dart does not automatically cast those types you have to handle it manually. So you have two options here:

  • Change the variable type to num wich will cast the value automatically to double because both int and double extends from num.
num temperature;

temperature = 24; // works
temperature = 24.5; // also works
  • Cast the value to num. Works because num is the super class of double.
int temperature;

temperature = 24.0 as num; // works

// does not work 
// temperature = 24.5 as int;

Upvotes: 0

Wail Hayaly
Wail Hayaly

Reputation: 1227

As the error says

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

that's because you're storing a data of type int in a variable of type double so try this code 

double temp = weatherData['main']['temp'].toDouble();

Upvotes: 2

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