How to get build and version number of Flutter app

Retrieving the internal version number of an application in Flutter is a common requirement, especially when you need to display it within the app or perform certain operations based on the version number. Flutter provides a straightforward way to access this information, primarily through the use of the package_info plugin.

First, you need to add the package_info plugin to your Flutter project. You can add the following dependency in the pubspec.yaml file:

yaml
dependencies:
  package_info: ^2.0.2

Then, run flutter pub get in the terminal to install the plugin.

Next, you can import the package_info package in your Dart code and use it to retrieve version information:

dart
import 'package:package_info/package_info.dart';

void getVersionInfo() async {
  PackageInfo packageInfo = await PackageInfo.fromPlatform();
  String appName = packageInfo.appName;
  String packageName = packageInfo.packageName;
  String version = packageInfo.version;
  String buildNumber = packageInfo.buildNumber;

  print("Application Name: $appName");
  print("Package Name: $packageName");
  print("Version: $version");
  print("Build Number: $buildNumber");
}

In this code snippet, PackageInfo.fromPlatform() is an asynchronous method that retrieves package information from the platform. The returned PackageInfo object contains details such as the application name, package name, version number, and build number.

This information is typically defined in the pubspec.yaml file during development:

yaml
version: 1.0.0+1

Here, 1.0.0 represents the version number, and +1 represents the build number.

By using the package_info plugin, you can conveniently retrieve and utilize this version-related information within your Flutter application, whether for displaying it to users or for executing logic operations such as version control.