A very good Flutter setup

A very good guide to configuring your local environment for Flutter projects

Flutter
January 26, 2022
and 
January 26, 2022
updated on
February 7, 2022
By 
Guest Contributor

If you're looking for a very good guide to help you install and configure your local environment to work on Flutter projects, you've come to the right place! This article will walk you through this process.

You will find a setup section with step-by-step instructions for installation and configuration, which includes common errors, code snippets, screenshots, and (lots of) GIFs.

Note that this is an opinionated guide to configuring your local environment according to our preferences — feel free to use whatever setup works best for you. As we primarily use macOS for Flutter development at VGV, this article is written for macOS users and assumes you have Google Chrome installed on your machine.

Set Up ⚙️

Before getting started, be aware this process may be a lengthy one due to the size of some of the installation packages and downloads.

1 - Xcode

You will need the latest stable version of XCode on your Mac to develop Flutter apps for iOS. You can download it directly from the App Store.

This is by far the lengthiest step, and it may take a while to complete depending on your Internet connection and machine. So, in the meantime, you can check these fun resources on Flutter:

Once the download has been completed, you will find the Xcode icon showing the installation progress on your Launchpad.

It's highly advisable not to continue with any of the following steps until this process has been fully completed to avoid potential issues.

Are you still there? Good! You now need to open Xcode for the first time to Agree on the Xcode and Apple SDKs Agreement. Have your macOS user's password ready, as you'll be prompted to enter it to install all the required components. Et voilà! 🎉

To check that everything has been completed successfully, press Command ⌘ + Space Bar, type Terminal, and press Enter ↩. This will open a terminal window where you'll need to type:

/usr/bin/xcodebuild -version

Hit Enter ↩ again. You should see the Xcode version you've just installed as well as its build version id.


2 - iTerm + Oh My Zsh

Speaking of a Terminal: How about we get a nicer one? Simply go to the iTerm website and download it. Getting it installed on your Mac is as easy as unzipping the .zip file in your Downloads folder and then double-clicking on the unzipped iTerm.

To ensure you've installed it correctly, type the following into the opened iTerm window.

zsh --version

Do you want to make it even neater? That's what Oh My Zsh is for. This open-source, community-driven framework "takes advantage of the hundreds of powerful plugins and beautiful themes" while managing your Zsh configuration. To get it installed, just copy and paste this command into your iTerm window and hit Enter ↩.

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

3 - Homebrew

This installation is not required to get Flutter working on your machine, but it is required if you want to streamline downloading and maintaining packages. As the people behind this handy project said, it is "The Missing Package Manager for macOS (or Linux)." So, are you ready for another lengthy install?

Let's download and install it all at once. Copy the following command into an iTerm window and press Enter ↩.

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

If it seems like it's stuck while Downloading Command Line Tools, you’re not alone. This part of the process may take a while. If it seems like progress is going slowly, you can check that the download is being completed successfully by clicking on the Apple icon found at the top left corner → About This Mac → Storage → See how the available space on your Macintosh HD decreases. Once this download is complete, the process should continue and finish successfully.

As usual, you can check that everything went okay by checking the brew version you just installed.

brew --version

4 - Git

The previous Xcode installation also included git, so there's no need to install it separately. However, if you'd like to have Homebrew manage git, you could simply execute brew install git in an iTerm window.


5 - LCOV

"LCOV is a graphical front-end for GCC's coverage testing tool gcov." Once again, this tool is not needed to get Flutter working on your machine, but it comes in handy when testing your code. What it lacks in appealing graphics it makes up for in simplicity and usefulness! Besides, it's the shortest installation, and it sure is worth the five seconds it takes to get it on your machine - Execute in an iTerm window, and you'll be done.

brew install lcov

Feels good after installing Xcode, doesn't it?

6 - Android Studio

Back to things required for a proper and successful Flutter installation, it's time to address the green Android in the room. You need to install Android Studio to get the Android SDK, but as you'll see in the following steps, we'll be using Visual Studio Code for Flutter Development as our preferred IDE. Again, this is an opinionated guide, so feel free to use whichever IDE works best for you.

To download Android Studio, navigate to the official website, click download, accept the terms and conditions, and select the kind of Mac you're using — I used Mac with Intel chip in this tutorial, but if you have a newer Mac from 2020 onward with an M1 (Apple Silicon) chip, choose "Mac with Apple chip" instead. Once the download is completed, open the .dmg file and drag Android Studio into the Applications folder. Finally, open Android Studio and complete the initial configuration steps as shown below.

7 - Flutter

If you've made it this far, you’re ready to finally install Flutter!

This article won't go too in-depth into the whole installation process as the official get-started installation guide does an outstanding job at walking you through each step. However, you can complement that guide with the steps presented below to avoid potential issues — or vice versa 😉.

First, download the flutter_macos_-stable.zip archive from the official guide. This will place a .zip file in your Downloads folder.

Moving on, open an iTerm window and check that your present working directory is /Users/<your_user>. Otherwise, execute the following commands to navigate to that directory, create a new directory, and navigate into it.

cd ~
mkdir development
cd development

Notice we named it development as it is a common practice among developers. Nonetheless, feel free to name it however you'd like.

Lastly, unzip the previously downloaded Flutter installation bundle containing the latest stable release of the Flutter SDK by typing unzip and then dragging the .zip file into the iTerm window — this will avoid potential path errors. Press Enter ↩ and wait for the process to complete. Then, add the Flutter tool to your path by executing the following.

Notice that this is a temporary path used to check if everything is fine for now.

export PATH="$PATH:`pwd`/flutter/bin"

You should now be able to check the version you just installed.

flutter --version

If you now run:

flutter doctor

you'll notice there are a few checks that are failing. So, let's take care of that right now.

Let's permanently add Flutter to our path by navigating back to your user directory and opening the .zshrc file with the following commands:

cd ~
nano .zshrc

This will open a file where you'll need to copy and paste the following configurations:

# Flutter
export FLUTTER_HOME=~/development/flutter
PATH=$PATH:$FLUTTER_HOME/bin:$PATH

# Dart (as part of Flutter)
export DART_HOME=~/development/flutter/bin/cache/dart-sdk
PATH=$PATH:$DART_HOME/bin:$PATH
PATH=$PATH:~/.pub-cache/bin:$PATH

Press Control ^ + X to close the file, then press Y to save it, and Enter ↩ to go back to the command line.

That being done, we can check that an iOS simulator can be opened executing:

sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer

Enter your password when prompted and then hit Enter ↩. You should now be able to open an iOS simulator by executing:

open -a Simulator

Next up, fixing the infamous cocoapods error. Running:

sudo gem install cocoapods

may produce a very verbose error indicating that the process failed. Nonetheless, the solution is quite simple, and all you need to do is execute the following two commands.

brew cleanup -d -v
brew install cocoapods

Let's now configure Android Studio so we can run and test Flutter on an Android Emulator. Open Android Studio → More Actions → AVD Manager. This will open the Android Virtual Device Manager, where you need to click on + Create Virtual Device... Among all the options listed under Phone, choose the newest device found at the very top - Pixel XL, when writing this article. Click Next, and download the latest system image - R, when writing this article. Accept the Terms and Conditions and wait for the installation to complete. Click Next, and in this screen, change the Graphics to Hardware - GLES 2.0. Click on Finish... and close Android Studio before your RAM starts complaining.

You can now Agree to the necessary Android Licenses. So head on over to iTerm, run:

flutter doctor --android-licenses

and accept them as they come.

An additional device you may want to run your Flutter projects on is your own Mac. To enable desktop support, execute:

flutter config --enable-macos-desktop

Last but not least, you need to add a few additional commands to your .zshrc file. Execute:

nano ~/.zshrc

to open the file, and copy the following configurations:

# Android Configuration
export ANDROID_HOME=~/Library/Android/sdk
PATH=$PATH:$ANDROID_HOME/build-tools
PATH=$PATH:$ANDROID_HOME/platform-tools
PATH=$PATH:$ANDROID_HOME/tools
PATH=$PATH:$ANDROID_HOME/tools/bin/

# Ruby - Need to make sure that use the Homebrew Ruby, not the system one
export PATH="/usr/local/opt/ruby/bin:$PATH"

# Python
export PATH="/usr/local/opt/python/libexec/bin:$PATH"

Then press control ^ + x to close the file, then press y to save it, and Enter ↩ to go back to the command line.

And that's it! All the problems should now be gone, which you can check by seeing all the green check marks after running:

flutter doctor

8 - Node.js

This step is optional. You might consider installing the latest Node.js LTS, which includes npm. Thanks to Homebrew, all you need to do is execute:

brew install node

and check that it's been successfully installed by executing:

node --version

9 - Visual Studio Code

There are plenty of IDEs to work on Flutter development, but we tend to prefer VS Code. This popular, open-source IDE is easy to use, offers powerful developer tooling, and supports countless extensions to enhance your coding experience. The good news is that Flutter editor plugins are supported by Android Studio, IntelliJ, VS Code, or Emacs, so feel free to use the one that best suits your needs.

Having said that, let's download it and install it by unzipping the downloaded .zip file. Then, simply move the unzipped VS Code application into your Applications directory. Finally, as you did in previous steps, add the following configurations to your .zshrc file located in your Home (~) directory:

# VS Code
export PATH="$PATH:/Applications/Visual Studio Code.app/Contents/Resources/app/bin"

Perhaps the most compelling and impressive feature about VS Code is the range of extensions that you can add to tune your programming experience to your liking. Here is a list of extensions you might consider adding:

If you've never used VS Code and would like to familiarize yourself with it, check out Flutter's official guide, which covers how to create, edit, run and debug projects, among other useful information.


10 - Flutter Version Management (fvm)

Flutter is an amazing toolkit that enables developers to build exceptional applications. However, managing its different SDK versions, switching between channels, and using the correct configurations in separate projects can become cumbersome. One way to handle these potential complications is to use fvm. Let's download and install it. Start by running sequentially:

brew tap leoafarias/fvm 
brew install fvm
fvm --version

Let's now set Flutter's stable SDK globally by running:

fvm global stable

which will prompt you to install it.

Then, let's also install the beta SDK by executing:

fvm install beta

Once it completes, run the following command to check you have two different SDKs available through fvm.

fvm list

Lastly, modify VS Code's settings.json file to have access to fvm by adding:

{
 	"dart.flutterSdkPath": ".fvm/flutter_sdk",
 	// Remove .fvm files from search
 	"search.exclude": {
 		"**/.fvm": true
 	},
 	// Remove from file watching
 	"files.watcherExclude": {
 		"**/.fvm": true
 	}
}

Congratulations! You've successfully completed this guide, and you now have a robust, convenient, and very good Flutter setup on your Mac 👏

Start your next Flutter project with a scalable foundation with Very Good CLI.

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