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flutterでアプリのバージョンを取得する

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Flutterでアプリのバージョン情報を取得するには公式のpackage_infoプラグインを使用します。

pubspec.yaml
  # dependencies:に追記
  package_info: 0.3.2

情報の取得は非同期になります。画面に表示するにはFutureBuilderやStatefullWidgetを使うのがよいでしょう。
versionは1.0.0のような情報、buildNumberはAndroidでいうVersionCode、iOSでいうCFBundleVersionです。

import 'package:package_info/package_info.dart';

PackageInfo packageInfo = await PackageInfo.fromPlatform();

String appName = packageInfo.appName;
String packageName = packageInfo.packageName;
String version = packageInfo.version;
String buildNumber = packageInfo.buildNumber;
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