how to use a variable in another class in Flutter/dart

Question

I have a statfull class called 'Location' which get the location with Geolocatar and Im showing the location with this :

 Text(currentPosition!=null? '$currentPosition' : '----',),

and this is :

static Position? currentPosition;

and I have another class called 'WeatherApi' which Im using Openweathermap Api to get the weather . now I want to use the currentPosition in the api url

https://api.openweathermap.org/data/2.5/weather?lat=44.34&lon=10.99&appid={API key}

how can I use the currentPosition in the url? I have tried widget.variablename but didn't work

pewds · Accepted Answer · 2023-01-13 05:58:06Z

2

You can pass the location details through the constructor of the WeatherApi class. Create a final variable(currentPosition) in the WeatherApi class and make it as required and when you navigate from Location screen to WeatherApi screen, in the

Navigator.push(context, //your route => WeatherApi(currentPosition: currentPosition));

and to use the variable, do widget.currentPosition in the WeatherApi class

Check out this for more info

edited Jan 13, 2023 at 5:58

answered Jan 12, 2023 at 11:36

pewds

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1 Comment

Community Over a year ago

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

Munsif Ali · Accepted Answer · 2023-01-14 20:12:01Z

0

In Flutter, one way to pass a variable from one class to another is Using a constructor: You can pass the variable as a parameter in the constructor of the class that needs the variable. you can read the details in the official documentation

answered Jan 14, 2023 at 20:12

Munsif Ali

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Comments

P.J.Radadiya · Accepted Answer · 2023-01-16 05:42:34Z

You can define a global variable outside the 'Location' widget as a 'currentPosition',

class Position {
  static String? currentPosition;
}

call from 'Location' this variable and set it.

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    Position.currentPosition = 'currentPosition';
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: TextButton(
          onPressed: () {
            Navigator.of(context).push(
              MaterialPageRoute(
                builder: ((context) => LocationWidget()),
              ),
            );
          },
          child: Text('Click Me'),
        ),
      ),
    );
  }
}

Then call it again from 'WeatherApi' and use it.

class WeatherWidget extends StatefulWidget {
  const WeatherWidget({super.key});

  @override
  State<WeatherWidget> createState() => _WeatherWidgetState();
}

class _WeatherWidgetState extends State<WeatherWidget> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text(Position.currentPosition ?? 'null'),
      ),
    );
  }
}

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