file_picker 1.2.0

A plugin that allows you to pick absolute paths from diferent file types.

example/lib/main.dart

import 'package:flutter/material.dart';

import 'package:flutter/services.dart';
import 'package:file_picker/file_picker.dart';

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

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

class _MyAppState extends State<MyApp> {
  String _fileName = '...';
  String _path = '...';
  String _extension;
  bool _hasValidMime = false;
  FileType _pickingType;
  TextEditingController _controller = new TextEditingController();

  @override
  void initState() {
    super.initState();
    _controller.addListener(() => _extension = _controller.text);
  }

  void _openFileExplorer() async {
    if (_pickingType != FileType.CUSTOM || _hasValidMime) {
      try {
        _path = await FilePicker.getFilePath(type: _pickingType, fileExtension: _extension);
      } on PlatformException catch (e) {
        print("Unsupported operation" + e.toString());
      }

      if (!mounted) return;

      setState(() {
        _fileName = _path != null ? _path.split('/').last : '...';
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Scaffold(
        appBar: new AppBar(
          title: const Text('Plugin example app'),
        ),
        body: SingleChildScrollView(
          child: new Center(
              child: new Padding(
            padding: const EdgeInsets.only(top: 50.0, left: 10.0, right: 10.0),
            child: new Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                new Padding(
                  padding: const EdgeInsets.only(top: 20.0),
                  child: new DropdownButton(
                      hint: new Text('LOAD PATH FROM'),
                      value: _pickingType,
                      items: <DropdownMenuItem>[
                        new DropdownMenuItem(
                          child: new Text('FROM CAMERA'),
                          value: FileType.CAMERA,
                        ),
                        new DropdownMenuItem(
                          child: new Text('FROM GALLERY'),
                          value: FileType.IMAGE,
                        ),
                        new DropdownMenuItem(
                          child: new Text('FROM VIDEO'),
                          value: FileType.VIDEO,
                        ),
                        new DropdownMenuItem(
                          child: new Text('FROM ANY'),
                          value: FileType.ANY,
                        ),
                        new DropdownMenuItem(
                          child: new Text('CUSTOM FORMAT'),
                          value: FileType.CUSTOM,
                        ),
                      ],
                      onChanged: (value) => setState(() => _pickingType = value)),
                ),
                new ConstrainedBox(
                  constraints: new BoxConstraints(maxWidth: 150.0),
                  child: _pickingType == FileType.CUSTOM
                      ? new TextFormField(
                          maxLength: 20,
                          autovalidate: true,
                          controller: _controller,
                          decoration: InputDecoration(labelText: 'File type'),
                          keyboardType: TextInputType.text,
                          textCapitalization: TextCapitalization.none,
                          validator: (value) {
                            RegExp reg = new RegExp(r'[^a-zA-Z0-9]');
                            if (reg.hasMatch(value)) {
                              _hasValidMime = false;
                              return 'Invalid format';
                            }
                            _hasValidMime = true;
                          },
                        )
                      : new Container(),
                ),
                new Padding(
                  padding: const EdgeInsets.only(top: 50.0, bottom: 20.0),
                  child: new RaisedButton(
                    onPressed: () => _openFileExplorer(),
                    child: new Text("Open file picker"),
                  ),
                ),
                new Text(
                  'URI PATH ',
                  textAlign: TextAlign.center,
                  style: new TextStyle(fontWeight: FontWeight.bold),
                ),
                new Text(
                  _path ?? '...',
                  textAlign: TextAlign.center,
                  softWrap: true,
                  textScaleFactor: 0.85,
                ),
                new Padding(
                  padding: const EdgeInsets.only(top: 10.0),
                  child: new Text(
                    'FILE NAME ',
                    textAlign: TextAlign.center,
                    style: new TextStyle(fontWeight: FontWeight.bold),
                  ),
                ),
                new Text(
                  _fileName,
                  textAlign: TextAlign.center,
                ),
              ],
            ),
          )),
        ),
      ),
    );
  }
}