How to migrate Flutter app to Web

According to Google Blog, google announced that Flutter framework will be beyond mobile. For now, we can use Flutter not only to develop app for iOS or Android, but also develop application for Web, Desktop and Embedded.

For us, the ability to reach users on mobile, web, or desktop through the single code (or with little modification) will help us a lot in term of cost and time saving.

This topic, we will focus on Flutter for Web.


Flutter Architecture

Flutter for Web Architecture

Overall, the Flutter for Web Architecture looks very similar to mobile architecture. The framework itself is written in Dart language. It provides abstractions for Theming, Widgets, Rendering, Animation, Painting, Gestures and UI Foundation. If you used to write code of Flutter app, you will be very familiar with these concepts.

Getting Start

Alright, let’s start with some basic.

First thing to do is installing the flutter_web built tools:

Ensure that the $HOME/.pub-cache/bin directory is in our path, to use webdev command from our terminal. In our case, we export PATH in .zshrc

Next, upgrade flutter

The flutter version should be higher than 1.5

Create a Project in Visual Studio Code

Use Flutter: New Web Project in Command Palette and create a new project.

After click enter, VS Code will create all necessary files and folder.

Next, run the following command for preview in browser.

This is different with Flutter app that we had to choose Start Debugging or Start Without Debugging.

That’s it, we can see our app is running on web browser.

Migrate Flutter app to web

In the end, we will have the result as following.

Currently, this Flutter for Web is still in development, we can see that plugins that we used before did not work yet. For example: fluttersparkline and cupertinoicons did not work, so we removed sparkline graph and replaced cupertino icons with material icons.

Following migrating guide,

  1. Modify pubspec.yaml
name: appbar_for_web
	description: A new Flutter project for Web.

	version: 1.0.0

	  sdk: '>=2.3.0-dev.0.1 <3.0.0'


	  flutter_web: any
	  flutter_web_ui: any

	  build_runner: ^1.4.0
	  build_web_compilers: ^2.0.0
	  pedantic: ^1.0.0

	      path: packages/flutter_web
	      path: packages/flutter_web_ui

2…Replace package:flutter to package:flutter_web and dart:ui to package:flutter_web_ui/ui.dart throughout application code in **lib/**directory.

  1. Create web/index.html and web/main.dart
<!DOCTYPE html>
	<html lang="en">
	  <meta charset="UTF-8">
	  <script defer src="main.dart.js" type="application/javascript"></script>

// Copyright 2019 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.
	import 'package:flutter_web_ui/ui.dart' as ui;
	import 'package:appbar_for_web/main.dart' as app;

	main() async {
	  await ui.webOnlyInitializePlatform();

  1. Move assets folder inside web

By default, look like Flutter for Web looks for assets in web folder. So, we had to move it into here. But the good thing is, we didn’t have to define assets in pubspec.yaml anymore. Flutter for Web will automatically recognize it. We could access to the assets by:

  1. FontManifest.json

Since cupertino icons did not work, we will use material icon by define in FontManfest.json (be careful about the spelling), and put the file inside web.

	      "family": "MaterialIcons",
	      "fonts": [
	          "asset": ""

After all these modification, we run $ webdev serve — auto restart, and, yes, it’s running on web browser.


Otherwise, it’s required some modification on source codes and files. We can say that Flutter for Web worked like magic. With one single code, we can run on application on Mobile and Web.

Source code can be found on Github.

#flutter #google-chrome #web-development

What is GEEK

Buddha Community

How to migrate Flutter app to Web

Google's Flutter 1.20 stable announced with new features - Navoki

Flutter Google cross-platform UI framework has released a new version 1.20 stable.

Flutter is Google’s UI framework to make apps for Android, iOS, Web, Windows, Mac, Linux, and Fuchsia OS. Since the last 2 years, the flutter Framework has already achieved popularity among mobile developers to develop Android and iOS apps. In the last few releases, Flutter also added the support of making web applications and desktop applications.

Last month they introduced the support of the Linux desktop app that can be distributed through Canonical Snap Store(Snapcraft), this enables the developers to publish there Linux desktop app for their users and publish on Snap Store.  If you want to learn how to Publish Flutter Desktop app in Snap Store that here is the tutorial.

Flutter 1.20 Framework is built on Google’s made Dart programming language that is a cross-platform language providing native performance, new UI widgets, and other more features for the developer usage.

Here are the few key points of this release:

Performance improvements for Flutter and Dart

In this release, they have got multiple performance improvements in the Dart language itself. A new improvement is to reduce the app size in the release versions of the app. Another performance improvement is to reduce junk in the display of app animation by using the warm-up phase.


If your app is junk information during the first run then the Skia Shading Language shader provides for pre-compilation as part of your app’s build. This can speed it up by more than 2x.

Added a better support of mouse cursors for web and desktop flutter app,. Now many widgets will show cursor on top of them or you can specify the type of supported cursor you want.

Autofill for mobile text fields

Autofill was already supported in native applications now its been added to the Flutter SDK. Now prefilled information stored by your OS can be used for autofill in the application. This feature will be available soon on the flutter web.


A new widget for interaction

InteractiveViewer is a new widget design for common interactions in your app like pan, zoom drag and drop for resizing the widget. Informations on this you can check more on this API documentation where you can try this widget on the DartPad. In this release, drag-drop has more features added like you can know precisely where the drop happened and get the position.

Updated Material Slider, RangeSlider, TimePicker, and DatePicker

In this new release, there are many pre-existing widgets that were updated to match the latest material guidelines, these updates include better interaction with Slider and RangeSliderDatePicker with support for date range and time picker with the new style.


New pubspec.yaml format

Other than these widget updates there is some update within the project also like in pubspec.yaml file format. If you are a flutter plugin publisher then your old pubspec.yaml  is no longer supported to publish a plugin as the older format does not specify for which platform plugin you are making. All existing plugin will continue to work with flutter apps but you should make a plugin update as soon as possible.

Preview of embedded Dart DevTools in Visual Studio Code

Visual Studio code flutter extension got an update in this release. You get a preview of new features where you can analyze that Dev tools in your coding workspace. Enable this feature in your vs code by _dart.previewEmbeddedDevTools_setting. Dart DevTools menu you can choose your favorite page embed on your code workspace.

Network tracking

The updated the Dev tools comes with the network page that enables network profiling. You can track the timings and other information like status and content type of your** network calls** within your app. You can also monitor gRPC traffic.

Generate type-safe platform channels for platform interop

Pigeon is a command-line tool that will generate types of safe platform channels without adding additional dependencies. With this instead of manually matching method strings on platform channel and serializing arguments, you can invoke native class and pass nonprimitive data objects by directly calling the Dartmethod.

There is still a long list of updates in the new version of Flutter 1.2 that we cannot cover in this blog. You can get more details you can visit the official site to know more. Also, you can subscribe to the Navoki newsletter to get updates on these features and upcoming new updates and lessons. In upcoming new versions, we might see more new features and improvements.

You can get more free Flutter tutorials you can follow these courses:

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The Ultimate Guide To Tik Tok Clone App With Firebase - Ep 2

The Ultimate Guide To Tik Tok Clone App With Firebase - Ep 2
In this video, I'm going to show you how to make a Cool Tik Tok App a new Instagram using Flutter,firebase and visual studio code.

In this tutorial, you will learn how to Upload a Profile Pic to Firestore Data Storage.

🚀 Nice, clean and modern TikTok Clone #App #UI made in #Flutter⚠️

Starter Project :

► Timestamps 
0:00 Intro 0:20 
Upload Profile Screen 
16:35 Image Picker
20:06 Image Cropper 
24:25 Firestore Data Storage Configuration.

⚠️ IMPORTANT: If you want to learn, I strongly advise you to watch the video at a slow speed and try to follow the code and understand what is done, without having to copy the code, and then download it from GitHub.

► Social Media 

► Previous Episode :
► Playlist:

I hope you liked it, and don't forget to like,comment, subscribe, share this video with your friends, and star the repository on GitHub!
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