I have the most strange behaviour in Flutter, and I can’t for the life of me figure out why it happens. It is not a critical bug in any way, I am just so annoyed that I can’t find the reason for it!

I have a Flutter-app, that is built for iOS and Android. The dependency Package Info Plus is used to retrieve the app version and build number using this simple widget:

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

  @override
  Widget build(BuildContext context) => FutureBuilder<String>(
        future: _getAppVersion(),
        builder: (context, snapshot) => snapshot.hasData
            ? Text(
                'v${snapshot.data}',
                style: context.textTheme.bodySmall!.apply(
                  color: context.customColorScheme?.whiteFixed,
                ),
                textAlign: TextAlign.center,
              )
            : const SizedBox.shrink(),
      );

  Future<String> _getAppVersion() async {
    final packageInfo = await PackageInfo.fromPlatform();

    final appVersion = packageInfo.version;
    final buildVersion = packageInfo.buildNumber;

    return '$appVersion ($buildVersion)';
  }
}

On iOS, this works perfectly, if the app version is 1.0.0 and the build number is 123, it will output 1.0.0 (123). On android however, it outputs 1.0.0 (2123). I have tried different build numbers, and realised that on android, the number 2000 is always added to the build number. If I change build number to 12345, it will output 14345. Why???

I have done some debugging, in build.gradle I added the following:

println "Debug Output: Version Code = ${flutterVersionCode}"
println "Debug Output: Version Name = ${flutterVersionName}"

And during the Android build-process, it correctly outputs:

Debug Output: Version Code = 123
Debug Output: Version Name = 1.0.0

No one else seems to have this issue when I search for it, so I don’t really know what else to try or what the reason might be?!