1import 'dart:io';
2
3import 'package:flutter/material.dart';
4import 'package:path_provider/path_provider.dart';
5import 'package:pspdfkit_flutter/pspdfkit.dart';
6
7const String DOCUMENT_PATH = 'PDFs/Document.pdf';
8
9void main() => runApp(MyApp());
10
11class MyApp extends StatefulWidget {
12	@override
13	_MyAppState createState() => _MyAppState();
14}
15
16class _MyAppState extends State<MyApp> {
17	void showDocument(BuildContext context) async {
18		final bytes = await DefaultAssetBundle.of(context).load(DOCUMENT_PATH);
19		final list = bytes.buffer.asUint8List();
20
21		final tempDir = await getTemporaryDirectory();
22		final tempDocumentPath = '${tempDir.path}/$DOCUMENT_PATH';
23
24		final file = await File(tempDocumentPath).create(recursive: true);
25		file.writeAsBytesSync(list);
26
27		await Pspdfkit.present(tempDocumentPath);
28	}
29
30	@override
31	Widget build(BuildContext context) {
32		final themeData = Theme.of(context);
33		return MaterialApp(
34			home: Scaffold(
35				body: Builder(
36					builder: (BuildContext context) {
37						return Center(
38							child: Column(
39								mainAxisAlignment: MainAxisAlignment.spaceEvenly,
40								children: [
41									ElevatedButton(
42										child: Text(
43											'Tap to Open Document',
44											style: themeData.textTheme.headline4?.copyWith(fontSize: 21.0),
45										),
46										onPressed: () => showDocument(context),
47									),
48								],
49							),
50						);
51					},
52				),
53			),
54		);
55	}
56}