KAlertFlutter

A modern, professional, customizable Material-style alert dialog library for Flutter.

🚀 What is KAlertFlutter?

KAlertFlutter is a lightweight, modern, and professional alert dialog package for Flutter.

It is inspired by the native Android Java library KAlertDialog and brings a similar beautiful dialog experience to Flutter apps.

With KAlertFlutter, you can quickly create:

Success dialogs
Error dialogs
Warning dialogs
Info dialogs
Question dialogs
Confirm dialogs
Prompt/input dialogs
Progress/loading dialogs
Custom image dialogs
URL image dialogs
Custom view dialogs
WebView dialogs
Terms and Privacy Policy dialogs
Modern styled dialogs
Dark mode friendly dialogs
Input validation dialogs
Fully customizable button dialogs

🌐 Related Native Android Library

KAlertFlutter is designed to match the native Android Java library KAlertDialog.

If you are building a native Android app in Java, use the Android version here:

Native Android Java Library:
https://github.com/TutorialsAndroid/KAlertDialog

🔗 pub.dev Package

https://pub.dev/packages/kalertflutter

❤️ Support the Project

If you find KAlertFlutter useful, please support the project:

⭐ Star this repository
🐛 Report issues
💡 Suggest new features
📦 Like the package on pub.dev
🚀 Share it with other Flutter developers

Follow me on Instagram for more developer content:

📸 https://instagram.com/coderx09

If this library helps you, please consider supporting my open-source work.

Thanks for your support! 🚀

✨ Features

Dialog Types

✅ Normal dialog
✅ Success dialog
✅ Error dialog
✅ Warning dialog
✅ Info dialog
✅ Question dialog
✅ Confirm dialog
✅ Prompt/input dialog
✅ Progress/loading dialog
✅ Custom image dialog
✅ URL image dialog
✅ Custom view dialog
✅ WebView dialog
✅ Terms and Privacy Policy dialog

Styling Features

✅ Modern Material-style UI
✅ Rounded dialog corners
✅ Modern style presets
✅ Classic style preset
✅ Minimal style preset
✅ Rounded style preset
✅ Custom dialog corner radius
✅ Custom dialog elevation
✅ Custom dialog dim amount
✅ Dark mode support
✅ Custom title text style
✅ Custom content text style
✅ Title font weight support
✅ Content font weight support
✅ Button font weight support
✅ Button text size support
✅ Button all-caps control
✅ Custom button colors
✅ Custom icon colors
✅ Custom background colors

Advanced Features

✅ Input validation
✅ Input max length
✅ Input keyboard type
✅ Input confirm callback
✅ Custom Flutter widget inside dialog
✅ WebView inside dialog
✅ Hosted web page loading
✅ WebView loading progress
✅ Center WebView loading spinner
✅ WebView page started callback
✅ WebView page finished callback
✅ WebView page error callback
✅ WebView navigation request callback
✅ JavaScript enable/disable support
✅ WebView zoom enable/disable support
✅ Main-frame-only WebView error handling
✅ URL image big mode
✅ URL image circle mode
✅ URL image placeholder
✅ URL image error widget
✅ Progress dialog
✅ Show callback
✅ Dismiss callback
✅ Confirm callback
✅ Cancel callback
✅ Backward compatible old API

📸 Screenshot Gallery

Add your screenshots inside the art/new/ folder using the same file names shown below.

Modern Success Dialog	Custom Radius, Elevation and Dim	Title and Content Font Weight
Basic Message Dialog	Error Dialog	Warning Confirm / Cancel Flow	Info Dialog	Question Dialog
Input Dialog with Validation	Custom View Dialog
Custom Image Dialog	URL Image Circle Dialog	Big URL Image Dialog
Button Styling	Progress Dialog	Show and Dismiss Callbacks
WebView Terms and Privacy Dialog

📦 Installation

Add this to your pubspec.yaml:

dependencies:
  kalertflutter: ^2.1.0

Then run:

flutter pub get

🌐 WebView Platform Setup

KAlertFlutter includes WebView dialog support for showing hosted pages such as Terms and Conditions, Privacy Policy, Refund Policy, Help pages, FAQ pages, and documentation pages inside a dialog.

For Android apps, add Internet permission in:

android/app/src/main/AndroidManifest.xml

Place it above the <application> tag:

<uses-permission android:name="android.permission.INTERNET" />

For best compatibility, use secure HTTPS URLs:

url: 'https://example.com/privacy-policy'

Avoid using http:// URLs unless your app is configured for cleartext traffic.

🚀 Import

import 'package:kalertflutter/kalertflutter.dart';

⚡ Quick Start

KAlertDialog.success(
  context: context,
  title: 'Success',
  content: 'Your changes were saved successfully.',
  confirmText: 'Done',
);

🎨 Dialog Types

KAlertFlutter supports these dialog types:

KAlertType.normal
KAlertType.success
KAlertType.error
KAlertType.warning
KAlertType.info
KAlertType.question
KAlertType.progress
KAlertType.input
KAlertType.customImage
KAlertType.urlImage
KAlertType.customView
KAlertType.webView

🎭 Style Presets

KAlertFlutter includes modern style presets:

KAlertStyle.classic
KAlertStyle.modern
KAlertStyle.minimal
KAlertStyle.rounded

Example:

KAlertDialog.show(
  context: context,
  title: 'Modern Dialog',
  content: 'This dialog uses the modern style preset.',
  type: KAlertType.normal,
  style: KAlertStyle.modern,
);

✅ Success Dialog

KAlertDialog.success(
  context: context,
  title: 'Success',
  content: 'Your action was completed successfully.',
  confirmText: 'OK',
);

❌ Error Dialog

KAlertDialog.error(
  context: context,
  title: 'Oops...',
  content: 'Something went wrong. Please try again.',
  confirmText: 'Try Again',
);

⚠️ Warning Dialog

KAlertDialog.warning(
  context: context,
  title: 'Are you sure?',
  content: 'This action cannot be undone.',
  confirmText: 'Confirm',
  cancelText: 'Cancel',
);

ℹ️ Info Dialog

KAlertDialog.info(
  context: context,
  title: 'Information',
  content: 'Here is some useful information.',
  confirmText: 'Got it',
);

❓ Question Dialog

final result = await KAlertDialog.question(
  context: context,
  title: 'Continue?',
  content: 'Do you want to continue with this action?',
  confirmText: 'Yes',
  cancelText: 'No',
);

if (result?.confirmed == true) {
  debugPrint('User selected yes');
}

🗑️ Confirm Dialog / Warning Flow

final result = await KAlertDialog.warning(
  context: context,
  title: 'Delete this file?',
  content: 'This action cannot be undone.',
  confirmText: 'Delete',
  cancelText: 'Cancel',
);

if (result?.confirmed == true) {
  KAlertDialog.success(
    context: context,
    title: 'Deleted',
    content: 'The file has been deleted successfully.',
  );
} else if (result?.cancelled == true) {
  KAlertDialog.error(
    context: context,
    title: 'Cancelled',
    content: 'Your file is safe. No changes were made.',
  );
}

🔄 Progress Dialog

KAlertDialog.progress(
  context: context,
  title: 'Processing',
  content: 'Please wait while we prepare your request.',
  barrierDismissible: false,
);

Example with auto close:

KAlertDialog.progress(
  context: context,
  title: 'Processing',
  content: 'Please wait while we prepare your request.',
  barrierDismissible: false,
);

await Future.delayed(const Duration(seconds: 3));

if (context.mounted) {
  Navigator.of(context).pop();

  KAlertDialog.success(
    context: context,
    title: 'Completed',
    content: 'Your request has been completed successfully.',
  );
}

⌨️ Input Dialog with Validation

final result = await KAlertDialog.input(
  context: context,
  title: 'Create Project',
  content: 'Enter a project name with at least 3 characters.',
  hintText: 'Project name',
  initialValue: 'KAlertFlutter',
  maxLength: 30,
  validator: (input) {
    if (input.trim().length < 3) {
      return 'Project name must be at least 3 characters';
    }
    return null;
  },
  onInputConfirm: (input) {
    debugPrint('Created: $input');
  },
);

if (result?.confirmed == true) {
  debugPrint('Input value: ${result?.value}');
}

🧩 Custom View Dialog

You can place any Flutter widget inside the dialog.

final controller = TextEditingController();

KAlertDialog.customView(
  context: context,
  title: 'Custom View',
  content: 'This dialog uses your own custom Flutter widget.',
  showCancelButton: true,
  confirmText: 'Save',
  cancelText: 'Cancel',
  child: Column(
    mainAxisSize: MainAxisSize.min,
    children: [
      TextField(
        controller: controller,
        decoration: const InputDecoration(
          labelText: 'Project name',
          hintText: 'Example: KAlertFlutter Pro',
          border: OutlineInputBorder(),
        ),
      ),
      const SizedBox(height: 10),
      const Text(
        'You can place any custom widget inside KAlertFlutter.',
        textAlign: TextAlign.center,
      ),
    ],
  ),
  onConfirm: () {
    debugPrint('Saved: ${controller.text}');
  },
);

🌐 WebView Dialog

KAlertFlutter supports WebView dialogs for showing hosted web pages directly inside a dialog.

This is useful for:

Terms and Conditions
Privacy Policy
Refund Policy
Help pages
FAQ pages
Documentation pages
Hosted HTML content
Any web page that should open without leaving the app

Terms and Privacy Policy WebView Dialog

final result = await KAlertDialog.webView(
  context: context,
  title: 'Terms & Privacy Policy',
  content: 'Please read our terms and privacy policy before continuing.',
  url: 'https://policies.google.com/privacy',
  webViewHeight: 420,
  showHorizontalProgress: true,
  showCenterLoader: true,
  javaScriptEnabled: true,
  enableZoom: false,
  showCancelButton: true,
  confirmText: 'I Agree',
  cancelText: 'Cancel',
  onPageStarted: (url) {
    debugPrint('WebView started: $url');
  },
  onPageFinished: (url) {
    debugPrint('WebView finished: $url');
  },
  onProgress: (progress) {
    debugPrint('WebView progress: $progress');
  },
  onPageError: (error) {
    debugPrint('WebView error: ${error.description}');
  },
);

if (result?.confirmed == true) {
  debugPrint('Accepted');
}

WebView Dialog with Navigation Control

You can control which URLs are allowed to load inside the dialog.

final result = await KAlertDialog.webView(
  context: context,
  title: 'Privacy Policy',
  content: 'Please read the privacy policy before continuing.',
  url: 'https://example.com/privacy-policy',
  webViewHeight: 420,
  showCancelButton: true,
  confirmText: 'Accept',
  cancelText: 'Cancel',
  onNavigationRequest: (request) {
    if (request.url.startsWith('https://example.com')) {
      return NavigationDecision.navigate;
    }

    return NavigationDecision.prevent;
  },
);

WebView Dialog Methods

KAlertDialog.webView()
KAlertDialog.showWebView()

Available options:

url: 'https://example.com/privacy-policy'
title: 'Terms & Privacy Policy'
content: 'Please read the page before continuing.'
confirmText: 'I Agree'
cancelText: 'Cancel'
webViewHeight: 420
showHorizontalProgress: true
showCenterLoader: true
javaScriptEnabled: true
enableZoom: false
showCancelButton: true
showConfirmButton: true
showIcon: true
showCloseButton: false
progressColor: Colors.blue
onWebViewCreated: (controller) {}
onProgress: (progress) {}
onPageStarted: (url) {}
onPageFinished: (url) {}
onPageError: (error) {}
onNavigationRequest: (request) {}

Important WebView Error Note

Some websites may fail to load small internal resources such as favicon, analytics scripts, CSS, images, iframes, or tracking resources.

KAlertFlutter handles this professionally by reporting WebView errors only when the main page fails to load. This prevents false error messages when the actual page is already visible to the user.

🖼️ Custom Image Dialog

KAlertDialog.customImage(
  context: context,
  title: 'Custom Image',
  content: 'You can show an asset image, memory image or network image provider.',
  image: const AssetImage('assets/logo.png'),
  confirmText: 'OK',
);

Using network image provider:

KAlertDialog.customImage(
  context: context,
  title: 'Custom Image',
  content: 'This image uses NetworkImage.',
  image: const NetworkImage('https://example.com/image.png'),
);

🌐 URL Image Dialog

KAlertFlutter supports two URL image display types:

KAlertImageType.big
KAlertImageType.circle

Big URL Image

KAlertDialog.urlImage(
  context: context,
  title: 'Big URL Image',
  content: 'This image is loaded from a URL.',
  imageUrl: 'https://example.com/image.png',
  imageType: KAlertImageType.big,
  confirmText: 'Close',
);

Circle URL Image

KAlertDialog.urlImage(
  context: context,
  title: 'Circle URL Image',
  content: 'This image is shown in circle crop mode.',
  imageUrl: 'https://example.com/image.png',
  imageType: KAlertImageType.circle,
  confirmText: 'Nice',
);

🎨 Custom Dialog Appearance

KAlertDialog.show(
  context: context,
  title: 'Custom Appearance',
  content: 'This dialog has custom radius, elevation and dim amount.',
  type: KAlertType.normal,
  style: KAlertStyle.modern,
  cornerRadius: 30,
  elevation: 20,
  dimAmount: 0.60,
  backgroundColor: Colors.white,
  confirmText: 'Looks Good',
);

Available appearance options:

cornerRadius: 30
elevation: 20
dimAmount: 0.60
maxWidth: 360
backgroundColor: Colors.white
titleColor: Colors.black
contentColor: Colors.grey
iconColor: Colors.green

🔠 Font Weight and Text Styling

KAlertDialog.show(
  context: context,
  title: 'Font Weight Support',
  content: 'You can control title, content and button font weights.',
  type: KAlertType.normal,
  style: KAlertStyle.modern,
  titleFontWeight: FontWeight.w900,
  contentFontWeight: FontWeight.w500,
  confirmButtonFontWeight: FontWeight.w900,
  titleTextSize: 22,
  contentTextSize: 15,
  buttonTextSize: 15,
  confirmText: 'Awesome',
);

🔘 Button Styling

KAlertDialog.show(
  context: context,
  title: 'Button Styling',
  content: 'This example shows button text size, font weight, all caps control and custom colors.',
  type: KAlertType.normal,
  style: KAlertStyle.minimal,
  showCancelButton: true,
  confirmText: 'Accept',
  cancelText: 'Decline',
  confirmButtonColor: const Color(0xFF10B981),
  cancelButtonColor: const Color(0xFFE2E8F0),
  cancelTextColor: const Color(0xFF334155),
  confirmButtonFontWeight: FontWeight.w900,
  cancelButtonFontWeight: FontWeight.w900,
  buttonTextSize: 15,
  confirmButtonAllCaps: false,
  cancelButtonAllCaps: false,
);

🌙 Dark Mode Support

KAlertFlutter automatically respects your Flutter app theme.

Example:

MaterialApp(
  themeMode: ThemeMode.system,
  theme: ThemeData(
    useMaterial3: true,
    brightness: Brightness.light,
  ),
  darkTheme: ThemeData(
    useMaterial3: true,
    brightness: Brightness.dark,
  ),
  home: const HomePage(),
);

KAlertFlutter will automatically adapt when the app is in dark mode.

🔔 Callback APIs

KAlertDialog.show(
  context: context,
  title: 'Callbacks',
  content: 'This dialog shows callback APIs.',
  type: KAlertType.normal,
  showCancelButton: true,
  confirmText: 'Confirm',
  cancelText: 'Cancel',
  onShow: () {
    debugPrint('Dialog shown');
  },
  onDismiss: () {
    debugPrint('Dialog dismissed');
  },
  onConfirm: () {
    debugPrint('Confirmed');
  },
  onCancel: () {
    debugPrint('Cancelled');
  },
);

🔙 Backward Compatible Old API

Your previous API is still supported.

Old `KAlert.show()`

KAlert.show(
  context,
  title: 'Success',
  message: 'Saved successfully!',
  type: KAlertType.success,
);

Old `KAlert.confirm()`

bool? result = await KAlert.confirm(
  context,
  title: 'Delete file?',
  message: 'This action cannot be undone',
);

if (result == true) {
  debugPrint('User confirmed');
}

Old `KAlert.prompt()`

String? value = await KAlert.prompt(
  context,
  title: 'Enter your name',
  hintText: 'Your name',
);

debugPrint(value);

Old `KAlert.webView()`

final accepted = await KAlert.webView(
  context,
  url: 'https://policies.google.com/privacy',
  title: 'Terms & Privacy Policy',
  message: 'Please read the page before continuing.',
);

if (accepted == true) {
  debugPrint('Accepted');
}

📘 Complete Example

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'KAlertFlutter Demo',
      debugShowCheckedModeBanner: false,
      themeMode: ThemeMode.system,
      theme: ThemeData(
        useMaterial3: true,
        colorSchemeSeed: const Color(0xFF00D6C9),
        brightness: Brightness.light,
      ),
      darkTheme: ThemeData(
        useMaterial3: true,
        colorSchemeSeed: const Color(0xFF00D6C9),
        brightness: Brightness.dark,
      ),
      home: const DemoHomePage(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('KAlertFlutter Demo'),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          ElevatedButton(
            onPressed: () {
              KAlertDialog.success(
                context: context,
                title: 'Success',
                content: 'KAlertFlutter is working perfectly!',
                confirmText: 'Done',
              );
            },
            child: const Text('Show Success Dialog'),
          ),
          const SizedBox(height: 12),
          ElevatedButton(
            onPressed: () async {
              final result = await KAlertDialog.webView(
                context: context,
                title: 'Terms & Privacy Policy',
                content: 'Please read our terms before continuing.',
                url: 'https://policies.google.com/privacy',
                webViewHeight: 420,
                showCancelButton: true,
                confirmText: 'I Agree',
                cancelText: 'Cancel',
              );

              if (result?.confirmed == true) {
                debugPrint('Accepted');
              }
            },
            child: const Text('Show WebView Dialog'),
          ),
        ],
      )
    );
  }
}

🧪 Local Testing

If you are developing this package locally, run:

flutter clean
flutter pub get
flutter analyze
flutter test

To run the example app:

cd example
flutter pub get
flutter run

If the Android folder is missing inside example, run:

cd example
flutter create .
flutter pub get
flutter run

For testing WebView dialogs on Android, make sure this permission exists in the example app:

<uses-permission android:name="android.permission.INTERNET" />

📂 Repository

GitHub:

https://github.com/TutorialsAndroid/KAlertFlutter

Issues and feature requests are welcome.

📦 Package

pub.dev:

https://pub.dev/packages/kalertflutter

🤝 Related Projects

KAlertDialog for Native Android Java

If you are building a native Android app using Java, check out the original Android library:

KAlertDialog
https://github.com/TutorialsAndroid/KAlertDialog

📝 Migration from Older Version

Older versions used:

KAlert.show()
KAlert.confirm()
KAlert.prompt()
KAlert.webView()

These methods are still available.

New recommended API:

KAlertDialog.success()
KAlertDialog.error()
KAlertDialog.warning()
KAlertDialog.info()
KAlertDialog.question()
KAlertDialog.progress()
KAlertDialog.input()
KAlertDialog.customView()
KAlertDialog.customImage()
KAlertDialog.urlImage()
KAlertDialog.webView()
KAlertDialog.showWebView()

📌 API Summary

Dialog Types

KAlertType.normal
KAlertType.success
KAlertType.error
KAlertType.warning
KAlertType.info
KAlertType.question
KAlertType.progress
KAlertType.input
KAlertType.customImage
KAlertType.urlImage
KAlertType.customView
KAlertType.webView

Styles

KAlertStyle.classic
KAlertStyle.modern
KAlertStyle.minimal
KAlertStyle.rounded

Image Types

KAlertImageType.big
KAlertImageType.circle

Main Methods

KAlertDialog.show()
KAlertDialog.success()
KAlertDialog.error()
KAlertDialog.warning()
KAlertDialog.info()
KAlertDialog.question()
KAlertDialog.progress()
KAlertDialog.input()
KAlertDialog.customView()
KAlertDialog.customImage()
KAlertDialog.urlImage()
KAlertDialog.webView()
KAlertDialog.showWebView()

Backward Compatible Methods

KAlert.show()
KAlert.confirm()
KAlert.prompt()
KAlert.webView()

WebView Methods

KAlertDialog.webView()
KAlertDialog.showWebView()

WebView Options

url: 'https://example.com/privacy-policy'
webViewHeight: 420
showHorizontalProgress: true
showCenterLoader: true
javaScriptEnabled: true
enableZoom: false
progressColor: Colors.blue
onWebViewCreated: (controller) {}
onProgress: (progress) {}
onPageStarted: (url) {}
onPageFinished: (url) {}
onPageError: (error) {}
onNavigationRequest: (request) {}

📜 License

MIT License

Free for personal and commercial use.

MIT License

Copyright (c) 2026 TutorialsAndroid

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files, to deal in the Software
without restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies of the
Software, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Made with ❤️ by TutorialsAndroid

If this package helps you, please ⭐ star the repository and 👍 like the package on pub.dev.

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.github		.github
art		art
example		example
lib		lib
test		test
.gitignore		.gitignore
.metadata		.metadata
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
README.md		README.md
analysis_options.yaml		analysis_options.yaml
index.html		index.html
pubspec.yaml		pubspec.yaml

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KAlertFlutter

🚀 What is KAlertFlutter?

🌐 Related Native Android Library

🔗 pub.dev Package

❤️ Support the Project

✨ Features

Dialog Types

Styling Features

Advanced Features

📸 Screenshot Gallery

📦 Installation

🌐 WebView Platform Setup

🚀 Import

⚡ Quick Start

🎨 Dialog Types

🎭 Style Presets

✅ Success Dialog

❌ Error Dialog

⚠️ Warning Dialog

ℹ️ Info Dialog

❓ Question Dialog

🗑️ Confirm Dialog / Warning Flow

🔄 Progress Dialog

⌨️ Input Dialog with Validation

🧩 Custom View Dialog

🌐 WebView Dialog

Terms and Privacy Policy WebView Dialog

WebView Dialog with Navigation Control

WebView Dialog Methods

Important WebView Error Note

🖼️ Custom Image Dialog

🌐 URL Image Dialog

Big URL Image

Circle URL Image

🎨 Custom Dialog Appearance

🔠 Font Weight and Text Styling

🔘 Button Styling

🌙 Dark Mode Support

🔔 Callback APIs

🔙 Backward Compatible Old API

Old KAlert.show()

Old KAlert.confirm()

Old KAlert.prompt()

Old KAlert.webView()

📘 Complete Example

🧪 Local Testing

📂 Repository

📦 Package

🤝 Related Projects

KAlertDialog for Native Android Java

📝 Migration from Older Version

📌 API Summary

Dialog Types

Styles

Image Types

Main Methods

Backward Compatible Methods

WebView Methods

WebView Options

📜 License

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Old `KAlert.confirm()`

Old `KAlert.prompt()`

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