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Flutter Version Management

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fvm

Flutter Version Management: A simple cli to manage Flutter SDK versions.

FVM helps with the need for a consistent app builds by allowing to reference Flutter SDK version used on a per-project basis. It also allows you to have multiple Flutter versions installed to quickly validate and test upcoming Flutter releases with your apps, without waiting for Flutter installation every time.

Features:

Version Management

This tool allows you to manage multiple channels and releases, and caches these versions locally, so you don’t have to wait for a full setup every time you want to switch versions.

Also, it allows you to grab versions by a specific release, i.e. v1.2.0 or 1.17.0-dev.3.1. In case you have projects in different Flutter SDK versions and do not want to upgrade.

Usage

  1. Install Dart.
  2. Activate Fvm:
> pub global activate fvm

Read dart.dev docs for more info on how to run global dart scripts.

And then, for information on each command:

> fvm help

Install a SDK Version

FVM gives you the ability to install many Flutter releases or channels.

> fvm install <version>

Project Config SDK Version

If you configured your project to use a specific version, run install without any arguments will install the proper version.

> fvm install

Check out use command to see how to configure a version per project.

Use a SDK Version

You can use different Flutter SDK versions per project. To do that you have to go into the root of the project and:

> fvm use <version>

Set Global Version

If you want to use a specific version by default in your machine, you can specify the flag --global to the use command. A symbolic link to the Flutter version will be created in the fvm home folder, which you could then add to your PATH environment variable as follows: FVM_HOME/default/bin. Use fvm use --help, this will give you the exact path you need to configure.

** Do not activate fvm using flutter pub global activate** if you plan on using the –global flag.

> fvm use <version> --global

Force Flag

Fvm only allows to call the use command on Flutter projects. However if you want to call the use command on a non-flutter directory use the --force flag.

If you are starting a new project and plan on using fvm flutter create you wil have to use the --force flag

> fvm use <version> --force

Remove a SDK Version

Using the remove command will uninstall the SDK version locally, this will impact any projects that depend on that version of the SDK.

> fvm remove <version>

Upgrade the current SDK Version

To upgrade currently used Flutter SDK version (e.g. stable) you should call the Flutter SDK command as you would normally do in case of typical Flutter installation. See more in the section Running Flutter SDK commands.

> fvm flutter upgrade

List Installed Versions

List all the versions that are installed on your machine. This command will also output where FVM stores the SDK versions.

> fvm list

List Flutter Releases

Displays all Flutter releases, including the current version for dev, beta and stable channels.

> fvm releases

Change FVM Cache Directory

You are able to configure the fvm cache directory by setting FVM_HOME environment variable. If nothing is set the default fvm path will be used.

Running Flutter SDK commands

There are couple of ways you can interact with the Flutter SDK setup in your project. You can run all the Flutter commands through the fvm proxy commands.

Proxy Commands

Flutter command within fvm proxies all calls to the CLI just changing the SDK to be the local one.

For instance, to run the flutter run with a given Flutter SDK version just call the following. FVM will recursively try for a version in a parent directory.

> fvm flutter run

This syntax works also for commands with parameters. The following command will call flutter build for a selected flavor and target.

> fvm flutter build aab --release --flavor prod -t lib/main_prod.dart

In other words, calling a fvm flutter xxx command is equivalent to flutter xxx if fvm is available in the directory tree.

Call Local SDK Directly

You can also call the local SDK directly bypassing the proxy commands. FVM creates a symbolic link within your project called fvm which links to the installed version of the SDK.

> .fvm/flutter/bin run

The above example is equivalent to flutter run command using the local project SDK.

Configure Your IDE

In some situations you might have to restart your IDE and the Flutter debugger to make sure it uses the new version.

VSCode

Add the following to your settings.json. This will list list all Flutter SDKs installed when using VSCode when using Flutter: Change SDK.

Use fvm list to show you the path to the versions.

List all versions installed by FVM

You can see all the versions installed by FVM in VS Code by just providing path to versions directory:

{
  "dart.flutterSdkPaths": ["/Users/usr/fvm/versions"]
}

Alternatively, you can specify only selected versions. The following snippet will cause VS Code to show only stable and dev versions of Flutter.

{
  "dart.flutterSdkPaths": [
    "/Users/usr/fvm/versions/stable",
    "/Users/usr/fvm/versions/dev"
  ]
}

To change current Flutter version open a project and select Flutter: Change SDK in the command palette. You should see all the versions as depicted in the following screenshot.

You can also add the version symlink for dynamic switch

{
  "dart.flutterSdkPaths": [".fvm/flutter_sdk"]
}

Android Studio

Copy the absolute path of fvm symbolic link in your root project directory. Example: /absolute/path-to-your-project/.fvm/flutter_sdk

In the Android Studio menu open Languages & Frameworks -> Flutter or search for Flutter and change Flutter SDK path. Apply the changes. You now can Run and Debug with the selected versions of Flutter. Restart Android Studio to see the new settings applied.

Add your IDE instructions here

Working with this repo

Tests

pub run test

Publishing package

Before pushing package to pub.dev. Run command to create version constant.

pub run build_runner build

Update test coverage

To update test coverage run the following command.

pub run test_coverage

Troubleshooting

  1. On Windows make sure you are running as an administrator
  2. If you get errors with messages invalid kernel binary or invalid sdk hash it means you activated fvm using flutter pub global activate fvm. Only activate fvm using pub global activate fvm.

Dwonload Flutter Version Management app source code on GitHub

https://github.com/leoafarias/fvm

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