Native Gallery open code

gallery_launch.dart

import 'dart:io';

import 'package:url_launcher/url_launcher.dart';

mixin GalleryLaunch {
  final String _iosPhotoScheme = 'photos-redirect://';
  final String _androidPhotoScheme = 'content://media/external/images/media';

  /// It'll be open gallery on device
  ///
  /// If you want to open specific image on android, you should be call media/56.png
  Future<void> open() async {
    await launchUrl(Uri.parse(Platform.isIOS ? _iosPhotoScheme : _androidPhotoScheme));
  }
}