Flutter seems to have a very strict/rigid structure for plugins with example folder and all contents inside that folder.
I want to provide multiple examples with my plugin. Something like examples folder and then examples/demo1 and examples/demo2 as two different app examples.
I tried doing this but flutter run or pub get command breaks with this change. it's gets stuck with below error which wasn't thrown with exact same code in previous structure before change. Also my app actually follow embedding v2 code so this error is completely false too.
The plugin `<MY PLUGIN>` requires your app to be migrated to the Android embedding v2. Follow the steps on
https://flutter.dev/go/android-project-migration and re-run this command.
Somehow is it expecting that there should be only one example and that too with example folder only ?
Can someone help, and if possible point me to a plugin project where it's using multiple examples ?
After trying multiple ways to deal with the situation,
I ended up with a good enough solution.
I moved entire flutter repo inside an sdk directory, and then Introduced a samples folder at root level which can contain multiple sample applications.
sdk itself has a default sample app under example folder which I kept so sdk can ship with one example project.
Final structure look like below,
- Root
- sdk
- Flutter plugin project (like android/example/ios/lib directory etc.)
- samples
- sampleOne
- sampleTwo
I then mentioned relative path to sdk for sampleOne or sampleTwo inside their pubspec.yaml like path: ../../sdk/
When I want to open sampleOne in AndroidStudio, I import sampleOne directory and it works like charm. Make sure you don't import entire samples directory or sampleOne/Android.
For any regular Flutter commands for plugin, I run them inside sdk directory and everything works fine as expected. So I would run publish or pub get inside root/sdk directory
Related
Whenever I have a problem with Flutter I often find answers saying 'reinstall the Flutter SDK'.
However I cannot find any clear instructions on how to do this (please direct me to them if I am wrong).
General Questions
By 'clear' instructions, I mean ones that answer the following questions:
What folder(s) should be deleted to remove Flutter from my computer?
Do any files need to be copied and added to the new Flutter folder once I reinstall it?
Do I need to make any changes to my Flutter projects either before or after reinstalling Flutter?
Will I need to download the same channel (stable, beta, dev, master) as what I am currently on?
Will I need to make any changes to my PATH?
Are these the correct steps to reinstall?
Go to https://flutter.dev/docs/development/tools/sdk/releases?tab=macos
Download the zip of the release you want (safest to use latest stable version)
Open Flutter zip in SAME location as the previous Flutter folder was
Done - I should now be able to run Flutter projects without any further steps
Apologies if these seem like very basic questions but for someone fairly new it isn't obvious what the answers are.
I'm new to Flutter and had similar issues. I will outline what worked for me but meanwhile, to answer your questions:
What folder(s) should be deleted to remove Flutter from my computer?
The Flutter folder which you unzipped and, presumably added to $PATH. Although not deleting it isn't going to pose an issue. I have separate folders of different versions of Flutter on my computer and it's fine.
Do any files need to be copied and added to the new Flutter folder
once I reinstall it?
Try a fresh download of Flutter and unzip it? There is no need to copy or add any files to the Flutter folder once you've (re)installed it.
Do I need to make any changes to my Flutter projects either before or
after reinstalling Flutter?
Not exactly sure what you mean by make changes to your Flutter projects. If you ran flutter doctor and didn't get any errors, then it's good to go. When you create a new Flutter project either in Android Studio, VS Code or Terminal, it will automatically handle whatever file copying business.
Will I need to download the same channel (stable, beta, dev, master)
as what I am currently on?
No, you only need one. I suggest you download one from Stable unless you need web support, which would be Beta.
Will I need to make any changes to my PATH?
After you've unzipped your fresh copy of Flutter (note the folder destination), open Terminal and change the path to said folder destination but make sure it's the /bin folder you're mapping to.
Are these the correct steps to reinstall?
Go to
https://flutter.dev/docs/development/tools/sdk/releases?tab=macos
Download the zip of the release you want (safest to use latest stable
version) Open Flutter zip in SAME location as the previous Flutter
folder was Done - I should now be able to run Flutter projects without
any further steps
Yes and no. You're missing a number of steps. Please follow the full Flutter installation guide depending on your OS.
It took me about 10 hours over two days and a VPN to finally get it working in China with an old install from two years ago when I was in Montréal.
I have a Flutter project that currently builds for iOS and Android. I created the project around Flutter v1.9 or so. Since creating the project, I have added flavor support to my project (dev, prod) via the guide found here
However, after having done this, it doesn't seem like I am able to add web support to my project. Following Flutter's official instructions to enable web for a pre-existing project, I try to run flutter create . in the root directory of the project. When I do this I get the output:
The Xcode project defines schemes: dev, prod You must specify a --flavor option to select one of the available schemes.
So I try to run: flutter create . --flavor=dev and get Multiple output directories specified. Try moving --flavor=dev to be immediately following create
Soooo, I try: flutter create --flavor=dev . and get Could not find an option named "flavor".
Does anyone know how I can initialize web for this project? Thanks.
You need to do the following:
Goto root folder and rename manually ios folder temporarily to something like ios1
Goto terminal and make sure you are standing in root, then run this line:
flutter create --platforms=web .
Return to project folder and rename back manually ios1 to ios
Done
In javascript, we have NPM and the node_modules folder in every project. I was not able to find a similar concept for Dart/ Flutter, except the build folder in my app, which contains a folder of a few dependencies I have in pubspec.yaml. It doesn't have any of the source code though, and I think it's actually built from something else. I've also looked in /usr/local/flutter/packages which is where my flutter is installed, but it only shows flutter_driver, flutter_goldens, and more seemingly unrelated folders.
I guess if wanted to read the source code, I really need to find the repo and read from that, or is there a location for dependencies I haven't looked?
I even found projectDir/.dart_tool/pub, which didn't have any of my packages.
From the documentation:
Dependencies downloaded over the internet, such as those from Git and
the pub.dev site, are stored in a system-wide cache. This means that
if multiple packages use the same version of the same dependency, it
only needs to be downloaded and stored locally once.
By default, the system package cache is located in the .pub-cache
subdirectory of your home directory (on Mac and Linux), or in
%APPDATA%\Pub\Cache (on Windows; the location might vary depending on
the Windows version). You can configure the location of the cache by
setting the PUB_CACHE environment variable before running pub.
So for Mac and Linux for example, this would be ~/.pub-cache/hosted/pub.dartlang.org by default.
In Android Studio
I could directly view the source code of the package under `
[External Libraries/Dart Packages/Your Packages]
`
You can get pubspec downloaded from your flutter sdk location .
/flutter/.pub-cache/hosted/pub.dartlang.org/
You can also clone package git .
If you are running Windows as your OS, you can find the packages under the folder that you installed your Flutter SDK to when setting up Android Studio.
In my case - using Windows 10 - the path is as follows, where C:\ is my primary harddrive and flutter\ the folder containing the Flutter SDK...
C:\flutter\.pub-cache\hosted\pub.dartlang.org\english_words-4.0.0
The above path for instance points to the "english words package", containing the most ~5000 used English words and some utility functions, which are mentioned and used in the Flutter tutorial on their official page for writing and running your first Flutter app.
https://pub.dev/packages/english_words
If you have installed flutter using snap then the location might be
/home/user/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org
I had forgotten that I've been command + clicking into these libraries all the time in VSCode.
However, it looks like packages are not stored in the app folder. Packages that we use in our projects are downloaded to $FLUTTER_PATH/.pub-cache, so if I'm looking for camera picker plugin, its in
/usr/local/flutter/.pub-cache/hosted/pub.dartlang.org/image_picker-0.6.5+2/lib/image_picker.dart
If you are using VScode you can find these dependencies under the dependencies window:
I have a Flutter app and a package folder loaded in VS code at the same time within a workspace. What entry do I need to make to my app's pubspec.yaml file to ensure that changes I've made to the package are compiled and included whenever I hot reload or restart the app? What would be an alternate strategy if this is not possible?
If your pubspec.yaml refers to your package with a path then I would expect this to happen automatically. If not, I would consider it a bug. Please file an issue at https://github.com/Dart-Code/Dart-Code and include a log file generated by running the Dart: Capture Logs command and as much info about your project layout as possible (a clonable repo to repro would be perfect).
Putting test files in the test directory involves mental gymnastics of remembering to move test file when sources move or to even find a corresponding test file.
Is there a way in flutter to place test files next the source?
flutter test -h doesn't have any path related options.
This can be achieved with
flutter test lib/**/*_test.dart
Found the hint from Dart test package readme at https://github.com/dart-lang/test/tree/master/pkgs/test#running-tests