I'm new to learning flutter when I try to crate a new project on android studio gives me a arror message in the event section enter image description here
The MESSAGE: [Could not find an option named "platforms". Run 'flutter -h' (or 'flutter -h') for available flutter commands and options.]
And another problem is flutter doctor does not see the android studio enter image description here
1(By the way, I want to use this version of flutter, please do not give a suggestion like update.)
2(this problem did not exist before, it happened after turning my computer off and on)
And sorry for my english mistakes
Thank you.
flutter version flutter_windows_v1.12.13+hotfix.9-stable
andorid studio version: 4.1.3
Is this the answer to your question about andorid studio?
and you need to install JDK
You are using the wrong flutter SDK. Too low information in your question. Make sure that you have the right path to flutter SDK in your IDE. Check that the flutter SDK directory has the appropriate structure, all needed files and cetera. Channel and version of flutter also may have an influence on this problem.
Got this today out of nowhere. Things were going well, but suddenly when I tried to relaunch the app from fresh, for the error Could not find an option named "target"
UPDATE:
This appears to happen when I switch branches and merge while app is running/flutter is attached. If you're using VS Code,
open your launch.json
change something, I decided to change type: "dart" to type: "notdart"
save
try to debug which fails
then revert that change.
This should fix the issue.
Previous Answer/If you're not using VS Code
What worked for me was to
flutter clean
close the editor (VS Code for me)
close the emulator
give a minute for things to close down
open task manager and kill any left over processes of dart.exe flutter.exe and java.exe and adb.exe (was doing Android)
start VS Code/Android Studio and try to debug again. (when prompted I chose to cold boot the emulator as well)
This takes a while as the emulator has to cold boot and since flutter clean was run, the compilation hadto start from scratch as well.
using the latest vs code, on a new installation, with only 1 plugin (which i know not to be causing the problem, since i have repeated the whole thing with another plugin; same issue) on a mac also using the latest catalina os.
issue:
writing a couple of pages (2 or 3) to the terminal, either from the terminal itself or from within the plugin, the terminal becomes unbearably slow, scrolling up or down freezes it entirely.
i found some previous links talking about this issue, but they are with older versions of vs code, and the responses have always been "this is now fixed in version xxx".
question:
is there some general setting in vs code that will prevent this?
or do you just have to wait for the next "updating", the next "breaking", the next "updating", etc?
Try this, now my terminal works faster also in Big Sur:
codesign --remove-signature /Applications/Visual\ Studio\ Code.app/Contents/Frameworks/Code\ Helper\ \(Renderer\).app
Even with the CTRL+SPACE shortcut, the options I get are nowhere near relevant to the code.
I created a new file named questions.dart in the lib folder along with main.dart. In main.dart the code autocomplete works fine but in question.dart, it doesn't. Also, the syntax is not getting highlighted as well in the new file.
For questions.dart
For main.dart
Restart the Dart Analysis Server. If that doesn't work, restart your IDE.
This happens to me occasionally. I believe it's an issue with the Dart Analysis Server. Usually, restarting the Dart Analysis Server fixes it.
To restart the Dart Analysis Server. Press ctrl + shift + p. Then search look for a command called Dart: Restart Analysis Server. If it doesn't work restart your IDE.
I'm facing the same issue here. I managed to solve it by switching flutter channel from master to beta. Now autocomplete works, but sometimes things still get crazy.
I just tried to execute Flutter: New Project, but it shows an error that could not find a flutter SDK.
I've ensured to complete all of the requirements from the flutter doctor.
Is there any way to solve this problem?
Thanks.
On macOS this was solved by following these steps.
First find where you downloaded the flutter sdk (Can be downloaded from here). It should be in your downloads folder unless you selected somewhere else.
Next:
Open up Terminal. Run the following command: sudo nano /etc/paths
Enter your password, when prompted.
Go to the bottom of the file, and enter the path you wish to add.
Hit control-x to quit.
Enter “Y” to save the modified buffer.
If the sdk is downloaded into your Downloads folder, your path to add should be /Users/yourusername/Downloads/flutter/bin
Lastly, quit and restart your terminal windows and VS Code. After restarting, both apps should recognize flutter and running flutter doctor should now work.
If you installed Flutter extension please restart VS_CODE and try it again. I already had the same problem.
The thing is VSCode looks for .packages file in your Flutter project this file contains path to your Flutter SDK & some other metadata. You're getting this error because either the .packages file is missing or either the path to Flutter SDK in .packages file contains some discrepancies.
To resolve it, you can;
Either edit the .packages file & set the path.
Or if you already have a working Flutter project then a .packages must've been already created. Copy that file & paste it in the root directory of your project.
Restart VSCode & run flutter pub get
This should resolve the issue.
Check your environment variables:
Look for the PATH if it exists append the full path to flutter\bin
using ; as a separator from existing values.
If it does not exist, create a new user variable named PATH with the
full path to flutter\bin as its value.
And check the installation guide
After doing this:
Open VS Code.
Press Ctrl + Shift + P.
Then type flutter and select run flutter doctor it should be fixed now.
Create a new project to make sure it's run.
For Linux Users
For future visitors :)
I had the same problem, in my Terminal flutter doctor or in general flutter was recognized, but VSCode couldn't recognize my SDK location so flutter doctor for instance didn't work.
The first thing to do is to follow the steps in flutter documentation: Flutter Doc
If it didn't work, change the environment variables directly.
sudo nano /etc/environment
Now add the location of the bin folder of your flutter SDK, The folder that you downloaded from here.
For example, you extracted it here: /Home/User/Software
Add /Home/User/Software/flutter/bin to the PATH variable. Paths are separated by a colon(:)
After a few solutions I tried, this one worked.
For Windows
Open Visual Studio Code
Click Locate SDK
Find your flutter folder
Click Save
Re-open your Visual Studio Code
Press Ctrl + Shift + P
Type flutter and choose Flutter: New Application Project
Type your project name (e.g: flutter_application_1)
Select a folder to create the project in
If you want to change your flutter sdk location
Go to Visual Studio Code > Manage > Setting (or with shortcut Ctrl
Search dart
Find [dart] configure setting to be overriden for [dart] language
Click Edit in settings.json
You'll see :
{
"dart.sdkPath": "C:\\tools\\dart-sdk",
"dart.flutterSdkPath": "C:\\tools\\flutter",
"[dart]": {
"editor.tabSize": 2,
"editor.insertSpaces": true,
"editor.detectIndentation": false,
"editor.suggest.insertMode": "replace"
}
}
Replace dart.sdkPath and dart.flutterSdkPath with your new sdk location
Installing Flutter on Linux is a breeze using snapd as is documented officially. But then trying to create a Flutter project by following the official steps as mentioned here - Test drive - Flutter will throw an error similar to the description provided in the question.
On a side note though, you don't have to bother adding Flutter to PATH if it was installed using snapd.
Rather, follow these steps:
flutter create <insert_app_folder_name>
cd <insert_app_folder_name>
code .
What it really does is:
The Flutter binary is called from within snapd & creates a project with a directory name you provide.
You can now cd into that specific directory.
Call VSCode in the current directory which opens a VSCode instance within the project directory.
Refer to the answer by #maheshmnj about the .package. This file was created by Flutter earlier if you followed the aforementioned steps.
This means the Flutter extension couldn't find the Flutter SDK automatically (eg. by looking in your PATH or a path configured with dart.flutterSdkPath). Clicking Locate SDK should let you browse to the SDK manually and record that location for the next time. If you see this again after restarting, that's definitely a bug in the Dart/Flutter extension, so please open an issue at https://github.com/Dart-Code/Dart-Code and include the output from clicking the Show Log button, as well as noting whether there's a dart.flutterSdkPath setting in your VS Code User Settings.
If you have just installed the flutter extension, close all the vs code applications running and restart the vs code then it will work as expected.
In order to run a new flutter project,
Go to vs code-> View tab -> command pallette -> select Flutter ->
give a name to the project ->give the path of the project
Now you are good to go with flutter.
I would like to complete NoobN3rd information.
In VSCode Linux I used this steps:
sudo nano /etc/environment
Type your password
I added 3 paths at the end of line:
3.1 /"flutter instalation directory"/flutter/bin
3.2 /"flutter instalation directory"/flutter/packages
3.3 /"flutter instalation directory"/flutter/dev
Save it and reboot your system
Look at my environment file to have an example:
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/paulo/development/flutter/bin:/home/paulo/development/flutter/packages:/home/paulo/development/flutter/dev"
if youknow where have you extracted your zip file of dart(Eg. at the time of extraction i setup the path C:\src\flutter)
then in vs code goto
c drive
-src
-flutter
-bin
-cache
-(dart-sdk)
select this folder and your
vs code will be adjusted.
I was facing the same problem. I've initially followed all the steps provided by installation guide of Flutter and was able to run an existing project using flutter run command.
So I've tried again repeating the very same steps of the installation guide and changed the path that I initially set like:
export PATH="$PATH:~/path/to/flutter/bin"
For one like:
export PATH="$PATH:/home/user/path/to/flutter/bin"
Then I run source ~/.bashrc and restarted Visual Code and worked! so I suppose that it was something related to ~ in the path.
I would like to add a complementary and alternative response to the Linux solutions given by NoobN3rd, Traufvihal and Paulo Ravaiano.
I'm using Manjaro and for some reason my Visual Studio Code was not picking up all the environment variables definition. I tried all the solutions and finally I realised the problem was not with the variables definition (my final solution contains them all in ~/.bashrc but it should work with /etc/environment as well) but on how Visual Studio Code was launched.
In case someone else is facing this problem, I noticed that running VS Code from the applications menu fails to link the environment variables for some reason. On the other hand, launching "code-oss" from the terminal does the trick and picks all my variables defined in my ~/.bashrc file.
Hope it helps!
I just got out of the same trouble, after numerous hit and trials trying to run flutter commands from vs code terminal the below set of steps got the things up for me.
In Ubuntu 18.04
Grab the path of the directory where flutter was unpacked by you.Mine was in the Home directory for the root user. Location can be any of your choice.
Go to the Home for your root user
Un-hide all of the hidden files in this directory.
Look for .bashrc file. Do not look for .profile file.
Open .bashrc file using nano/vim/text editor which ever you like.
Scroll to the bottom of the file and add this line -
export PATH="$PATH:pwd/flutter_linux/flutter/bin"
Quit all instances of the vscode (if any) opened.
Re-open and in the terminal type which flutter
Here -
I had re-named the un-zipped folder name like "flutter_linux_v1.12.13+hotfix.9-stable" with "flutter_linux"
Hope this helps......
i was also facing this error, after putting the flutter sdk path at the End of the PATH variable(not in middle or start) it works fine for me
For those who want to change their Flutter SDK path for the Dart & Flutter plugin
Click on Manage Icon(on Mac)
Click on Settings
On the Settings page, Click on Dart & Flutter.
Look for Dart: Sdk Path, click on Edit in settings.json
Edit dart.flutterSdkPath to your VSCode Flutter path
For me non of the answers helped.
What helped was (on macOS) opening the .bash_profile file via
sudo nano .bash_profile
and change the path to where my Flutter was as this has changed. Or add this line export PATH="$PATH:/home/user/path/to/flutter/bin"
hope this helpes.
QUICK SOLUTION!: If on macOS, PLUS everything had been working flawlessly previously, and this happens all of a sudden, or periodically, here is what I eventually discovered...
If your mac restarted, either on its own due to a crash, freeze or overnight install of updates, and VS Code was running, it generally restores all your vscode instances, but with various environment-related errors such as this one. The reason is that you are not running in the context of a shell and you don't have access to those environment settings. See this article from the VS Code documentation.
THE SOLUTION?: Quit and restart VS code as you normally would. Others have mentioned this, but I thought it would be good to know why this happens so you aren't surprised next time.
Please refer to the Get Flutter SDK section and locate where you have installed your flutter\bin folder. In my case, I put the flutter bin in my Documents folder.
See the following image Flutter\bin location
Windows
After make sure right Flutter version is in your path: https://docs.flutter.dev/get-started/install/windows
and you can run flutter doctor successfully
in VS Code you need to go to File->Preferences->Settings (or Ctrl+,)
then search for dart.flutterSdkPath then click on "Edit in settings.json" make sure it is the right path there.
I had the same problem, the solution was:
take the folder where you have extracted your zip file (for example: C:\src\flutter\flutter) then put it in the environment variable path and restart vscode.
I've just started playing with Flutter in VSCode. I also installed the Dart Plugin.
Running the demo app I read in the terminal
Is this the only way to hot-reload the app? I mean I should always keep the terminal open and focus on it to type "r" in order to reload my views?
Isn't there a shortcut directly from VSCode?
There's an extension for that. Called Dart Code and another one named Flutter Code
They will detect that your project is a Dart/Flutter project. And allows you to debug it + hot reload using f5.
For 2022, this solution worked.
Steps
Open Settings.
Paste this text > dart.flutterHotReloadOnSave on the settings search box.
And change value from "Manual" to "Always"
If you like to hot reload your app with a keybinding better than Ctrl+Shift+F5, just change the Debug: Restart to Ctrl+S, so whenever you trigger the the Ctrl+S the app will first save your changes according to the workbench.action.files.save and afterwards restart the app (=hot reload, it is the green circle you see in the debugbar).
Keybindings for VS Code:
VSCode debug -> start debuging, make a change and try, That's what you want.
No idea why F5 does not hot reload for me :(
But, you can map the -
Flutter: Hot Reload
command to whatever key combo floats your boat via -
Preferences > Keyboard ShortCuts
as in this screenshot -
open the Debug sidebar from VSCode and use it
then when you save, it will hot reload and apply the changes you make
that is what working with me
use the green reload button to hot reload the app in VS Code
on Mac select
Run without Debugging or Shift+f5
you will see this at top select the electric icon for Hot Reload.
After doing some changes save it. It will auto reflect changes.
yes Here is the plugin Dart Code for VS CODE
https://marketplace.visualstudio.com/items?itemName=Dart-Code.dart-code
here is official doc for VsCode flutter
https://flutter.io/get-started/editor/#vscode
In VS once installed Dart + Flutter extension, 2 options to hot reload 1) Use combo keys Command + Shift + F5. 2) Save the file by use combo keys Command + S
I have both extensions and VSCode is set to Hot Reload once a document is saved. The only time I can reload my app is by stopping and restarting my debugger
i dont know why but my vscode hot reloading not work if you have this problem you can use ctrl + f5 to refresh app.
hope to work for developers that hot reloading not work for them.
You need to run Flutter app from VS Code's built-in debugger not VS Code's terminal.
Select ▷ then "Run without Debugging" -> You can now use ⌘S on Mac to ⚡ Hot Reload ⚡
===== Aug 2022 UPDATE =====
v3.42 and above: You can enable hot reload on autosave in the latest version by setting Flutter Hot Reload On Save to allIfDirty in your VSCode settings.
===== Old Versions (Early 2022 and below) =====
v3.41 and below: You can enable hot reload on autosave in the latest version by setting Flutter Hot Reload On Save to always in your VSCode settings.
v3.19 only: They disabled hot reload on autosave completely.
v3.18 and below: The extension hot reloads automatically when auto saving.
if flutter and dart extensions already installed on vscode
Set from manual to All
If you run your flutter project from the terminal you will have to manually press r to do a hot reload.
Therefore use the Run and Debug option in the VS Code to test your project.
You may encounter problems with Hot Reload due to VS Code issues like this, which is relevant while writing this answer.
The most convincing way I see to do it without downgrading, updating to Insiders builds and/or loosing dev speed is to use the green restart/reload button in the VS Code run widget or Ctrl+Shift+F5 shortcut, but this option may be inacceptable for projects with trickier navigation and few different views.