open_app_file 4.0.2

A plugin to open files the app has permission to access with default system-provided applications.

example/lib/main.dart

import 'dart:io';
import 'dart:math';
import 'package:flutter/foundation.dart';

import 'package:open_app_file_example/native_utils.dart'
    if (dart.library.html) 'package:open_app_file_example/web_utils.dart';
import 'package:path_provider/path_provider.dart';
import 'package:http/http.dart';

import 'package:flutter/material.dart';
import 'dart:async';

// ignore: depend_on_referenced_packages
import 'package:open_app_file/open_app_file.dart';

void main() => runApp(const MyApp());

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  OpenResult? _openResult;
  final _fileNameController = TextEditingController(text: '/sdcard/test.txt');

  Future<String> _downloadFile(String url, String filename) async {
    if (kIsWeb) {
      // on the web there's no reason to download the file
      return url;
    }
    String dir = (await getTemporaryDirectory()).path;
    File targetFile = File('$dir/$filename');
    final httpClient = Client();
    var request = await httpClient.get(Uri.parse(url));
    var response = request.bodyBytes;
    await targetFile.writeAsBytes(response);
    return targetFile.path;
  }

  String _generateRandomString(int length) {
    var r = Random();
    return String.fromCharCodes(
        List.generate(length, (index) => r.nextInt(26) + 89));
  }

  Future<void> _openFile(String filePath) async {
    final result = await OpenAppFile.open(filePath);
    setState(() {
      _openResult = result;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: SingleChildScrollView(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Padding(
                padding: const EdgeInsets.symmetric(horizontal: 8.0, vertical: 24.0),
                child: Text(
                  _openResult == null
                      ? 'Result: none'
                      : 'Result: ${_openResult?.type}\nMessage: ${_openResult?.message}',
                  textAlign: TextAlign.center,
                ),
              ),
              ElevatedButton(
                child: const Text('Open generated file'),
                onPressed: () async {
                  _openFile(await createTextFile(_generateRandomString(30)));
                },
              ),
              const SizedBox(
                height: 8.0,
              ),
              ElevatedButton(
                child: const Text('Download and open image'),
                onPressed: () async {
                  _openFile(await _downloadFile(
                      'https://picsum.photos/200/300', 'test.jpg'));
                },
              ),
              const SizedBox(
                height: 8.0,
              ),
              ElevatedButton(
                  child: const Text('Download and open calendar event'),
                  onPressed: () async {
                    _openFile(await _downloadFile(
                        'https://raw.githubusercontent.com/yendoplan/open_app_file/master/example/files/test.ics',
                        'test.ics'));
                  }),
              const SizedBox(
                height: 8.0,
              ),
              ElevatedButton(
                child: const Text('Open non-existent file'),
                onPressed: () {
                  _openFile('asdf.qwert');
                },
              ),
              const Padding(
                padding: EdgeInsets.all(24.0),
                child: Text('To test external file access on Android:\n'
                    '1. Create or download a file to a restricted location (for example, "test.txt" in the root of external storage)\n'
                    '2. Set the file path in the field below and try to open it\n'
                    '3. Go to system settings and grant access to all files\n'
                    '4. Try to open the same file again\n'
                    'Use similar approach for media files: make an image like /sdcard/test.png and grant READ_EXTERNAL_STORAGE permission to the app'),
              ),
              Padding(
                padding: const EdgeInsets.symmetric(horizontal: 24.0),
                child: TextField(
                  controller: _fileNameController,
                ),
              ),
              ElevatedButton(
                child: const Text('Open file'),
                onPressed: () async {
                  _openFile(_fileNameController.value.text);
                },
              ),
            ],
          ),
        ),
      ),
    );
  }
}