import 'dart:io';
import 'package:flutter/material.dart';
import 'package:pdf/pdf.dart';
import 'package:path_provider/path_provider.dart';
import 'package:pdfdemo/pages/pdf_viewer.dart';
//import 'package:pdf/widgets.dart'

final pdf = Document();

return Scaffold(
      appBar: AppBar(title: Text("PDF CREATE"),
      actions: <Widget>[
        IconButton(
          icon: Icon(Icons.save),
          onPressed: () => savePdfFile(),
        )
      ],),
      body: pdf.addPage(Page(
      pageFormat: PdfPageFormat.a4,
      build: (BuildContext context) {
        return Center(
          child: Text("Hello Flutter"),
        );
      })),
    );

savePdfFile()async{
    final dir = await getExternalStorageDirectory();
    print("Directoryyyyyyyyy:${dir.path}");
    final String path = "${dir.path}/example.pdf";
    final file = File(path);
    await file.writeAsBytes(pdf.save());
     Navigator.of(context).push(
      MaterialPageRoute(builder: (_) => PgfViewerPage(path: path))
    );
  }

        Future<File> createPDF(){
         final Document pdf = Document();
            pdf.addPage(
                //Your PDF design here with the widget system of the plugin
MultiPage(
      pageFormat:
          PdfPageFormat.letter.copyWith(marginBottom: 1.5 * PdfPageFormat.cm),
      crossAxisAlignment: CrossAxisAlignment.start,
      theme: Theme(
        tableHeader: TextStyle(fontSize: 8.0),
        tableCell: TextStyle(fontSize: 8.0),
      ),
      header: (Context context) {
        if (context.pageNumber == 1) {
          return null;
        }
        return Container(
            alignment: Alignment.centerRight,
            margin: const EdgeInsets.only(bottom: 3.0 * PdfPageFormat.mm),
            padding: const EdgeInsets.only(bottom: 3.0 * PdfPageFormat.mm),
            decoration: const BoxDecoration(
                border:
                    BoxBorder(bottom: true, width: 0.5, color: PdfColors.grey)),
            child: Text('VCR',
                style: Theme.of(context)
                    .defaultTextStyle
                    .copyWith(color: PdfColors.grey)));
      },
    );
    
    
        output = await getTemporaryDirectory();
          final file = File('${output.path}/example.pdf');
          file.writeAsBytesSync(pdf.save());
        return file;
        }

import 'package:flutter/material.dart';
import 'package:flutter_full_pdf_viewer/full_pdf_viewer_scaffold.dart';
    class PDFScreen extends StatelessWidget {
      final String pathPDF;
      PDFScreen({this.pathPDF});
    
      @override
      Widget build(BuildContext context) {
        return PDFViewerScaffold(
            appBar: AppBar(
              title: Text("Document"),
              actions: <Widget>[
                IconButton(
                  icon: Icon(Icons.share),
                  onPressed: () {},
                ),
              ],
            ),
            path: pathPDF);
      }
    }

import 'package:image_gallery_saver/image_gallery_saver.dart';
import 'package:intl/intl.dart' as intl;
import 'package:permission_handler/permission_handler.dart';
import 'package:screenshot/screenshot.dart';
import 'dart:typed_data';
import 'package:syncfusion_flutter_pdf/pdf.dart';
import 'package:path_provider/path_provider.dart';
import 'package:open_file/open_file.dart';
// Will take screenshot of the widget and save in Unit8List and create pdf of //Unit8List
//paste this function where needed
openPDFofSS();
//Add controller
ScreenshotController screenshotController = ScreenshotController();
//define controller before in widget as
Screenshot(
controller: screenshotController,
child: Text("replace child with the widget you want to convert in pdf"),
),
// paste these function 
Future<void> openPDFofSS() async {
await screenshotController.capture().then((Uint8List image) {
//Capture Done
setState(() {
pdfLoading = true;
//save screenshot into Uint8List image
_imageFile = image;
//convert Unit8List image into PDF
_convertImageToPDF();
saveImage(_imageFile);
});
}).catchError((onError) {
print(onError);
});
}
Future<void> _convertImageToPDF() async {
//Create the PDF document
PdfDocument document = PdfDocument();
//Add the page
PdfPage page = document.pages.add();
//Load the image.
final PdfImage image = PdfBitmap(_imageFile);
//draw image to the first page
page.graphics.drawImage(
image, Rect.fromLTWH(-20, -20, page.size.width - 50, page.size.height));
//Save the docuemnt
List<int> bytes = document.save();
//Dispose the document.
document.dispose();
//Get external storage directory
Directory directory = await getApplicationDocumentsDirectory();
//Get directory path
String path = directory.path;
//Create an empty file to write PDF data
File file = File('$path/Output.pdf');
//Write PDF data
await file.writeAsBytes(bytes, flush: true);
print(path);
//Open the PDF document in mobile
OpenFile.open('$path/Output.pdf');
setState(() {
pdfLoading = false;
});
}
Future<String> saveImage(Uint8List image) async {
await [Permission.storage].request();
final result = await ImageGallerySaver.saveImage(image, name: 'autosmart');
return result['filePath'];
}