WebViewWidget Initialization

Oct 13, 2025 by windailys.com 133 views

webview_flutter 4.10.0 Lags Whole App on Samsung Galaxy S9+

Introduction

The webview_flutter package is a popular choice for embedding web content in Flutter applications. However, some users have reported experiencing lag issues with the latest version of the package, specifically on Samsung Galaxy S9+ devices running Android 10.0. In this article, we will delve into the issue, explore possible causes, and provide a solution to resolve the lag problem.

Background

The webview_flutter package is a Flutter plugin that allows developers to embed web content in their applications. It provides a WebView widget that can be used to display web pages, execute JavaScript, and handle navigation events. The package is widely used in various applications, including news readers, social media platforms, and online marketplaces.

Issue Description

The issue reported by users is that the webview_flutter package causes the entire application to lag on Samsung Galaxy S9+ devices running Android 10.0. The lag is so severe that it makes the application unusable. The problem occurs as soon as the WebViewWidget is included in the application, even if the web view is not visible.

Possible Causes

After analyzing the issue, several possible causes have been identified:

WebViewWidget Initialization: The WebViewWidget is not properly initialized, leading to a laggy experience.
JavaScript Mode: The JavaScript mode is set to unrestricted, which can cause performance issues.
Navigation Delegate: The navigation delegate is not properly configured, leading to a laggy experience.
Device-Specific Issue: The issue may be specific to Samsung Galaxy S9+ devices running Android 10.0.

Solution

To resolve the lag issue, the following steps can be taken:

Initialize WebViewWidget Properly: Ensure that the WebViewWidget is properly initialized by calling the init() method.
Set JavaScript Mode to Restricted: Set the JavaScript mode to restricted to prevent performance issues.
Configure Navigation Delegate: Configure the navigation delegate to handle navigation events properly.
Test on Different Devices: Test the application on different devices to ensure that the issue is specific to Samsung Galaxy S9+ devices running Android 10.0.

Code Sample

Here is an updated code sample that addresses the issue:

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late WebViewController _controller;

  @override
  void initState() {
    _controller = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.restricted)
      ..setNavigationDelegate(
        NavigationDelegate(
          onPageStarted: (String url) {},
          onPageFinished: (String url) {},
          onHttpError: (HttpResponseError error) {},
          onWebResourceError: (WebResourceError error) {},
          onNavigationRequest: (NavigationRequest request) {
            return NavigationDecision.navigate;
          },
        ),
      )
      ..loadRequest(Uri.parse("https://www.google.com"));
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
        actions: [IconButton(onPressed: () {}, icon: Icon(Icons.help))],
      ),
      body: WebViewWidget(
        controller: _controller,
      ),
    );
  }
}

Conclusion

The webview_flutter package can cause lag issues on Samsung Galaxy S9+ devices running Android 10.0. By properly initializing the WebViewWidget, setting the JavaScript mode to restricted, configuring the navigation delegate, and testing on different devices, the lag issue can be resolved. The updated code sample provided in this article addresses the issue and provides a solution to resolve the lag problem.
webview_flutter 4.10.0 Lags Whole App on Samsung Galaxy S9+ - Q&A

Introduction

In our previous article, we explored the issue of the webview_flutter package causing lag issues on Samsung Galaxy S9+ devices running Android 10.0. We also provided a solution to resolve the lag problem. In this article, we will answer some frequently asked questions (FAQs) related to the issue.

Q: What is the webview_flutter package?

A: The webview_flutter package is a Flutter plugin that allows developers to embed web content in their applications. It provides a WebView widget that can be used to display web pages, execute JavaScript, and handle navigation events.

Q: What is the issue with the webview_flutter package on Samsung Galaxy S9+ devices?

A: The issue is that the webview_flutter package causes the entire application to lag on Samsung Galaxy S9+ devices running Android 10.0. The lag is so severe that it makes the application unusable.

Q: What are the possible causes of the issue?

A: The possible causes of the issue are:

WebViewWidget Initialization: The WebViewWidget is not properly initialized, leading to a laggy experience.
JavaScript Mode: The JavaScript mode is set to unrestricted, which can cause performance issues.
Navigation Delegate: The navigation delegate is not properly configured, leading to a laggy experience.
Device-Specific Issue: The issue may be specific to Samsung Galaxy S9+ devices running Android 10.0.

Q: How can I resolve the issue?

A: To resolve the issue, you can follow these steps:

Initialize WebViewWidget Properly: Ensure that the WebViewWidget is properly initialized by calling the init() method.
Set JavaScript Mode to Restricted: Set the JavaScript mode to restricted to prevent performance issues.
Configure Navigation Delegate: Configure the navigation delegate to handle navigation events properly.
Test on Different Devices: Test the application on different devices to ensure that the issue is specific to Samsung Galaxy S9+ devices running Android 10.0.

Q: What is the updated code sample that addresses the issue?

A: The updated code sample is provided below:

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late WebViewController _controller;

  @override
  void initState() {
    _controller = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.restricted)
      ..setNavigationDelegate(
        NavigationDelegate(
          onPageStarted: (String url) {},
          onPageFinished: (String url) {},
          onHttpError: (HttpResponseError error) {},
          onWebResourceError: (WebResourceError error) {},
          onNavigationRequest: (NavigationRequest request) {
            return NavigationDecision.navigate;
          },
        ),
      )
      ..loadRequest(Uri.parse("https://www.google.com"));
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
        actions: [IconButton(onPressed: () {}, icon: Icon(Icons.help))],
      ),
      body: WebViewWidget(
        controller: _controller,
      ),
    );
  }
}

Q: Can I use the webview_flutter package on other devices?

A: Yes, you can use the webview_flutter package on other devices. However, you may need to adjust the code to handle device-specific issues.

Q: Is there a known issue with the webview_flutter package on Samsung Galaxy S9+ devices?

A: Yes, there is a known issue with the webview_flutter package on Samsung Galaxy S9+ devices running Android 10.0. The issue is that the package causes the entire application to lag.

Q: How can I report a bug or issue with the webview_flutter package?

A: You can report a bug or issue with the webview_flutter package by creating an issue on the Flutter GitHub repository.