gistfile1.txt

import 'dart:io';
import 'dart:ui' as ui;
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:logger/logger.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';

class ExampleWidget extends StatelessWidget {
  const ExampleWidget({super.key});
  GlobalKey _globalKey = GlobalKey();
  File? qrFilePath;
  @override
  Widget build(BuildContext context) {
    return  Scaffold(
    body:Center(child:
    GesturDetector(
    ontap:(){
    saveImageAsJPEG();
    },
    child:Text("TapMe);
    );
    
  }
}



  Future<ui.Image> captureImage() async {
    RenderRepaintBoundary boundary = _globalKey.currentContext!.findRenderObject() as RenderRepaintBoundary;
    final image = await boundary.toImage(pixelRatio: 1.0);

    return image;
  }

  Future<void> saveImageAsJPEG() async {
    final permissionStatus = await Permission.storage.status;

    if (permissionStatus.isGranted) {
      final appDocDirectory = Platform.isAndroid ? await getTemporaryDirectory()
          : await getApplicationSupportDirectory();

      qrFilePath = File(appDocDirectory.path + '/qr_${firstName}.png');

    if(mounted){
      ui.Image image = await captureImage();
      ByteData? byteData = await image.toByteData(format: ui.ImageByteFormat.png);
      if (byteData != null) {
        final buffer = byteData.buffer.asUint8List();
        await qrFilePath?.writeAsBytes(buffer);

      } else {
        logger.d('Image bytes is Null or Empty');
      }
    }

    } else {
      /// Permission not present
      /// request permission
      if (permissionStatus.isDenied) {
        await Permission.storage.request();
      } else if (permissionStatus.isPermanentlyDenied) {
        await openAppSettings();
      }
    }
  }
}