ResultScreen - View

result.dart

FlatButton(
  onPressed: () async {
    String downloadPath =
        await getApplicationDocumentsDirectoryPath();
    if (File('$downloadPath/$name.pdf').existsSync()) {
      Navigator.pushNamed(context, '/viewer',
          arguments: {'view': '$downloadPath/$name.pdf'});
    } else {
      Scaffold.of(context).showSnackBar(
        SnackBar(
          content: Text('$name.pdf File Not Found'),
          action: SnackBarAction(
            label: 'Download',
            onPressed: () {
              pdfGenerator(name);
              Scaffold.of(context).showSnackBar(
                SnackBar(
                  content: Text('$name.pdf downloaded'),
                  action: SnackBarAction(
                    label: 'View',
                    onPressed: () async {
                      String downloadPath =
                          await getApplicationDocumentsDirectoryPath();
                      Navigator.pushNamed(
                          context, '/viewer', arguments: {
                        'view': '$downloadPath/$name.pdf'
                      });
                    },
                  ),
                ),
              );
            },
          ),
        ),
      );
    }
  },
  child: Icon(Icons.open_in_new),
)