qr_from_file 0.0.2

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  • Changelog
  • Example
  • Installing
  • 56

qr_from_file #

Exclusive for Android

A plugin that scans qr code from files (only), whether it's from your flutter assets or your gallery.

Getting Started #

Make sure you have images downloaded for gallery qr scan.

For qr scanning of images inside your flutter assets dont forget to add them in your pubspec.yaml file.


Android #

The content of the qr barcode is given to a String:

For qr barcode images inside the flutter assets file:

String rawResult = QrFromFile.scanImageFromAssets('assets/images/qr_wikipedia.png'); //raw result

For qr barcode images inside the device storage (gallery):

String rawResult = QrFromFile.scanImageFromGallery('/storage/emulated/0/Download/qr_wikipedia.png'); //raw result

iOS #

For now the iOs functionality has been disabled. The app won't crash on iOS if you add it to your pubspec.yaml file.

0.0.2 #

  • Added example demonstration.

0.0.1 #

  • Initial release. Basic funcionality added.


qr_from_file_example #

Here's a more complex demonstration using the image_picker plugin.

Getting Started #

Make sure you add image_picker to the pubspec.yaml.

For more info on the image_picker plugin you can view the online documentation

import 'dart:io';

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:qr_from_file/qr_from_file.dart';
import 'package:image_picker/image_picker.dart';

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

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

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  String _result = '...';
  Future<File> _imageFile;
  VoidCallback listener;
  String _qrPath;

  void _onImageButtonPressed(ImageSource source) {
    setState(() {
        _imageFile = ImagePicker.pickImage(source: source);

  void initState() {
    listener = () {
      setState(() {});

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      platformVersion = await QrFromFile.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
  Widget _previewImage() {
    return FutureBuilder<File>(
        future: _imageFile,
        builder: (BuildContext context, AsyncSnapshot<File> snapshot) {
          if (snapshot.connectionState == ConnectionState.done &&
              snapshot.data != null) {
            _qrPath = snapshot.data.path;
            return Image.file(snapshot.data);
          } else if (snapshot.error != null) {
            return const Text(
              'Error picking image.',
              textAlign: TextAlign.center,
          } else {
            return const Text(
              'You have not yet picked an image.',
              textAlign: TextAlign.center,

  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        body: Center(
            child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('Running on: $_platformVersion\n'),
              child: Text('Scan Image'),
              onPressed: () {
                Future<String> futureResult =
                futureResult.then((res) {
                  _result = res;
                  setState(() {});

            new Center(
              child: _previewImage(),
            Text("Result is: $_result")
        floatingActionButton :FloatingActionButton(
            onPressed: () {
              _result = "...";
            heroTag: 'image0',
            tooltip: 'Pick Image from gallery',
            child: const Icon(Icons.photo_library),

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  qr_from_file: ^0.0.2

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:qr_from_file/qr_from_file.dart';
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Learn more about scoring.

We analyzed this package on Jan 25, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.0
  • pana: 0.13.4
  • Flutter: 1.12.13+hotfix.5

Health issues and suggestions

Document public APIs. (-1 points)

6 out of 6 API elements have no dartdoc comment.Providing good documentation for libraries, classes, functions, and other API elements improves code readability and helps developers find and use your API.

Format lib/qr_from_file.dart.

Run flutter format to format lib/qr_from_file.dart.

Maintenance suggestions

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.

Package is getting outdated. (-9.86 points)

The package was last published 57 weeks ago.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev.68.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8