Flutter get user agent

Flutter Get User Agent

To get the user agent in a Flutter application, you can use the flutter_webview_plugin package. This package provides a webview widget that allows you to display web content within your Flutter app.

First, add the flutter_webview_plugin package to your pubspec.yaml file:

dependencies:
  flutter_webview_plugin: ^0.3.10
  

Then, run flutter pub get to fetch the package.

Next, import the flutter_webview_plugin.dart file in your Dart code:

import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
  

Now, you can use the flutter_webview_plugin to create a webview widget and get the user agent. Here’s an example:

import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

void main() {
  runApp(MaterialApp(
    home: MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State {
  @override
  void initState() {
    super.initState();
    
    // Create an instance of the webview plugin
    final flutterWebviewPlugin = FlutterWebviewPlugin();
    
    // Listen for the webview page to finish loading
    flutterWebviewPlugin.onStateChanged.listen((WebViewStateChanged state) {
      // Check if the page finished loading
      if (state.type == WebViewState.finishLoad) {
        // Get the user agent
        flutterWebviewPlugin.evalJavascript('navigator.userAgent').then((result) {
          final userAgent = result.toString();
          print(userAgent);
        });
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Webview'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Open Webview'),
          onPressed: () {
            // Open a webview
            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (BuildContext context) => WebviewScaffold(
                  url: 'https://example.com',
                ),
              ),
            );
          },
        ),
      ),
    );
  }
}
  

In this example, a new webview is opened when the user presses the “Open Webview” button. Once the webview page finishes loading, the user agent is obtained using the evalJavascript method. The obtained user agent is then printed to the console.

Note that you need to grant the necessary permissions for the webview to work. This usually involves adding the internet permission to your Android manifest file and allowing arbitrary loads in your iOS info.plist file.