Check App Version

A Flutter plugin to compare the installed app version with a hypothetical published version of your app.

📱 Supported Platforms

Android	iOS	MacOS	Web	Linux	Windows
✔️	✔️	✔️	✔️	✔️	✔️

🔍 Overview

This plugin compares two versions of your app:

• The currently installed app version on the user's device
• A new release version defined in a JSON file

The plugin retrieves all necessary information for this comparison through a JSON file that you configure.

📋 JSON Structure

Key	Description
app_name	Your application name
new_app_version	New app version (e.g., "1.2.3")
new_app_code	New app build number
android_package	Android package name
ios_package	iOS bundle identifier
windows_package	Windows app package name
linux_package	Linux app package name
macos_package	macOS app package name
web_package	Web app package name
ios_app_id	iOS app ID number for App Store redirection

👉 Sample JSON file

⚙️ Installation

Import the Check App Version package

To use the Check App Version package, follow the plugin installation instructions.

Basic Usage

Add the following import to your Dart code:

import 'package:check_app_version/app_version_dialog.dart';

🧩 Display Options

The plugin offers three different ways to display the version update dialog:

1. AppVersionDialog

The standard pre-configured dialog:

AppVersionDialog(
  context: context,
  jsonUrl: 'https://example.com/app_version.json',
).show();

2. AppVersionCustomDialog

A dialog you can customize with your own builder:

AppVersionCustomDialog(
  context: context,
  jsonUrl: 'https://example.com/app_version.json',
  dialogBuilder: (BuildContext context) => AlertDialog(
    // Your custom dialog here
  ),
).show();

3. AppVersionOverlayDialog

A customizable overlay on top of your UI:

AppVersionOverlayDialog(
  context: context,
  jsonUrl: 'https://example.com/app_version.json',
  overlayBuilder: (BuildContext context) => AlertDialog(
    // Your custom overlay here
  ),
).show();

🖼️ Example

🎨 Customization

AppVersionDialog Options

Property	Description	Type	Default	Required
jsonUrl	URL to your JSON file	String	-	✅
context	BuildContext from widget tree	BuildContext	-	✅
onPressConfirm	Function called when update button is pressed	Function	null	❌
onPressDecline	Function called when decline button is pressed	Function	null	❌
showWeb	Show dialog in Flutter web apps	bool	true	❌
dialogRadius	Border radius of the dialog	double	8.0	❌
backgroundColor	Background color of the dialog	Color	Colors.white	❌
title	Dialog title text	String	"New Version Available"	❌
titleColor	Color of the dialog title	Color	Colors.black	❌
body	Dialog message body	String	"A new version is available. Update now for the latest features."	❌
bodyColor	Color of the message body	Color	Colors.black54	❌
barrierDismissible	Close dialog by tapping outside	bool	true	❌
onWillPop	Close dialog only using action buttons	bool	true	❌
updateButtonText	Text for the update button	String	"Update Now"	❌
updateButtonTextColor	Text color for the update button	Color	Colors.white	❌
updateButtonColor	Background color of the update button	Color	Colors.blue	❌
updateButtonRadius	Border radius of the update button	double	4.0	❌
laterButtonText	Text for the "Later" button	String	"Later"	❌
laterButtonColor	Color of the "Later" button	Color	Colors.grey	❌
laterButtonEnable	Show the "Later" button	bool	false	❌
cupertinoDialog	Use Cupertino style on iOS and macOS	bool	true	❌

AppVersionCustomDialog Options

Property	Description	Type	Default	Required
jsonUrl	URL to your JSON file	String	-	✅
context	BuildContext from widget tree	BuildContext	-	✅
dialogBuilder	Custom dialog builder function	Widget Function(BuildContext)	-	✅
showWeb	Show dialog in Flutter web apps	bool	true	❌
barrierDismissible	Close dialog by tapping outside	bool	true	❌

AppVersionOverlayDialog Options

Property	Description	Type	Default	Required
jsonUrl	URL to your JSON file	String	-	✅
context	BuildContext from widget tree	BuildContext	-	✅
overlayBuilder	Custom overlay builder function	Widget Function(BuildContext)	-	✅
showWeb	Show dialog in Flutter web apps	bool	true	❌
barrierDismissible	Close dialog by tapping outside	bool	true	❌

📝 Version Comparison Logic

The plugin automatically compares the installed version with the one specified in your JSON to determine if an update is needed. The comparison is performed on both the semantic version number and the app build code.

🔄 Complete Usage Example

import 'package:flutter/material.dart';
import 'package:check_app_version/app_version_dialog.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  void initState() {
    super.initState();
    // Check for updates when app starts
    WidgetsBinding.instance.addPostFrameCallback((_) {
      checkForUpdates();
    });
  }

  void checkForUpdates() {
    AppVersionDialog(
      context: context,
      jsonUrl: 'https://yourdomain.com/app_version.json',
      onPressConfirm: () {
        // Action when user chooses to update
        print('User chose to update');
      },
      onPressDecline: () {
        // Action when user declines update
        print('User chose to postpone');
      },
      laterButtonEnable: true,
    ).show();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Check App Version Demo')),
      body: Center(
        child: ElevatedButton(
          onPressed: checkForUpdates,
          child: Text('Check for Updates'),
        ),
      ),
    );
  }
}

💡 Common Use Cases

• Mandatory updates: Use laterButtonEnable: false to force updates
• Periodic notifications: Show the dialog only after a certain period since dismissal
• A/B update testing: Use different JSON files for different user segments
• Cross-platform consistency: Ensure the same update behavior across all platforms

🤝 Contributing

Contributions are welcome! Open an issue or submit a pull request.

📃 License

This package is released under the MIT license. See the LICENSE file for more details.