QRCodePlayground.dart

import 'package:flutter/material.dart';
import 'package:qr_flutter/qr_flutter.dart';
import 'package:screenshot/screenshot.dart';

class QRCodePlayground extends StatefulWidget {
  @override
  _QRCodePlaygroundState createState() => _QRCodePlaygroundState();
}

class _QRCodePlaygroundState extends State<QRCodePlayground> {
  ScreenshotController screenshotController = ScreenshotController();
  final TextEditingController tfController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16.0),
      child: ListView(
        children: [
          tfController.text.isEmpty
              ? SizedBox.shrink()
              : Screenshot(
              controller: screenshotController,
              child: QrImage(data: tfController.text)),
          SizedBox(height: 20),
          TextField(
            controller: tfController,
            decoration: InputDecoration(
                border: OutlineInputBorder(
                    borderSide: BorderSide(color: Colors.blue))),
          ),
          SizedBox(height: 20),
          RaisedButton(
            color: Colors.blue,
            textColor: Colors.white,
            child: Text('Generate QR Code'),
            onPressed: () => setState(() {}),
            padding: EdgeInsets.symmetric(vertical: 12),
          ),
          RaisedButton(
            onPressed: () {},
            color: Colors.blue,
            textColor: Colors.white,
            child: Text('Share QR code'),
            padding: EdgeInsets.symmetric(vertical: 12),
          ),
        ],
      ),
    );
  }

}