Cross-Platform Development Tutorials, Guides & Insights

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/weather_provider.dart';

class WeatherScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final weatherProvider = Provider.of<WeatherProvider>(context);

    return Scaffold(
      appBar: AppBar(
        title: Text('Weather App'),
      ),
      body: Center(
        child: weatherProvider.weather == null
            ? Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text(
                    'Enter City Name',
                    style: TextStyle(fontSize: 24),
                  ),
                  Padding(
                    padding: const EdgeInsets.all(16.0),
                    child: TextField(
                      onSubmitted: (value) {
                        weatherProvider.fetchWeather(value);
                      },
                      decoration: InputDecoration(
                        border: OutlineInputBorder(),
                        labelText: 'City',
                      ),
                    ),
                  ),
                ],
              )
            : Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text(
                    weatherProvider.weather!.cityName,
                    style: TextStyle(fontSize: 32, fontWeight: FontWeight.bold),
                  ),
                  SizedBox(height: 16),
                  Text(
                    '${weatherProvider.weather!.temperature}°C',
                    style: TextStyle(fontSize: 56),
                  ),
                  SizedBox(height: 16),
                  Image.network(
                    'http://openweathermap.org/img/wn/${weatherProvider.weather!.icon}@2x.png',
                  ),
                  SizedBox(height: 16),
                  Text(
                    weatherProvider.weather!.description,
                    style: TextStyle(fontSize: 24),
                  ),
                ],
              ),
      ),
    );
  }
}

Run the app using:

Replace the content of lib/main.dart with the following code:

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Counter'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}