To check whether there is an Internet connection available in a Flutter app, you can use the connectivity
package. This package provides a simple API for determining the network connectivity state.
Here’s an example of how to use the connectivity
package to check for an Internet connection in Flutter:
import 'package:connectivity/connectivity.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
ConnectivityResult _connectivityResult;
@override
void initState() {
super.initState();
Connectivity().onConnectivityChanged.listen((result) {
setState(() {
_connectivityResult = result;
});
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Center(
child: _connectivityResult == ConnectivityResult.none
? Text('No Internet Connection')
: Text('Internet Connection Available'),
),
),
);
}
}
In this example, the Connectivity
class is used to listen for changes in the network connectivity state. The onConnectivityChanged
stream is subscribed to, and the listen
method is used to update the _connectivityResult
field whenever the network connectivity state changes. The Text
widget in the build
method is used to display a message indicating whether or not there is an Internet connection available.
Note that this is just one way to check for an Internet connection in a Flutter app, and there are other approaches that can be used, such as using the dio
package or using the HttpClient
class. The method you choose will depend on your specific use case and requirements.