file_picker_cross 3.1.1

Select, open, choose or pick documents, images videos or other files on Android, iOS, the desktop and the web for reading, writing, use as String, byte list or HTTP uploads.

example/lib/main.dart

import 'dart:io';

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _fileString;
  int _fileLength = 0;
  String _filePath;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: ListView(
          padding: EdgeInsets.all(8),
          children: <Widget>[
            RaisedButton(
              onPressed: _selectFile,
              child: Text('Select File'),
            ),
            RaisedButton(
              onPressed: _selectSaveFile,
              child: Text('Select File To Save'),
            ),
            Text('File path: $_filePath (Might cause issues on web)\n'),
            Text('File length: $_fileLength\n'),
            Text('File as String: $_fileString\n'),
          ],
        ),
      ),
    );
  }

  void _selectFile() {
    FilePickerCross.pick().then((filePicker) => setState(() {
          _filePath = filePicker.path;
          _fileLength = filePicker.toUint8List().lengthInBytes;
          try {
            _fileString = filePicker.toString();
          } catch (e) {
            _fileString =
                'Not a text file. Showing base64.\n\n' + filePicker.toBase64();
          }
        }));
  }

  void _selectSaveFile() {
    FilePickerCross.save().then((filePicker) => setState(() {
          _filePath = filePicker.path;
          try {
            if (_filePath != "") {
              _fileString = 'file content';
              File f = File(_filePath);
              f.writeAsString(_fileString);
            }
          } catch (e) {
            _fileString = 'Error writing file. Path: $_filePath';
          }
          _fileLength = _fileString.length;
        }));
  }
}