Develop Reference

Unable to run Flutter project on Android after update

I've been trying to get my Flutter project to run after upgrading it to 2.10.4 and it's been a headache from the start. The project runs fine on a browser, but I'm having difficulty running on an Android emulator. I think I'm at the last hurdle, but I'm stumped right now. I'm receiving this error when running on VS Code:
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Failed to install the following SDK components:
build-tools;30.0.2 Android SDK Build-Tools 30.0.2
The SDK directory is not writable (C:\Program Files (x86)\Android\android-sdk)
Here's my Flutter Doctor:
PS D:\Documents\Flutter_Projects\glance> flutter doctor -v
[√] Flutter (Channel stable, 2.10.4, on Microsoft Windows [Version 10.0.19043.1586], locale en-US)
• Flutter version 2.10.4 at D:\Programs\flutter_windows_v1.2.1-stable\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision c860cba910 (3 weeks ago), 2022-03-25 00:23:12 -0500
• Engine revision 57d3bac3dd
• Dart version 2.16.2
• DevTools version 2.9.2
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at C:\Program Files (x86)\Android\android-sdk
• Platform android-31, build-tools 30.0.3
• ANDROID_HOME = C:\Users\reff1\AppData\Local\Android\Sdk
• ANDROID_SDK_ROOT = C:\Users\reff1\AppData\Local\Android\Sdk
• Java binary at: D:\AndroidStudio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 11.0.11+9-b60-7590822)
X Android license status unknown.
Run `flutter doctor --android-licenses` to accept the SDK licenses.
See https://flutter.dev/docs/get-started/install/windows#android-setup for more details.
[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
[X] Visual Studio - develop for Windows
X Visual Studio not installed; this is necessary for Windows development.
Download at https://visualstudio.microsoft.com/downloads/.
Please install the "Desktop development with C++" workload, including all of its default components
[√] Android Studio (version 2021.1)
• Android Studio at D:\AndroidStudio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.11+9-b60-7590822)
[!] Android Studio (version 4.1)
• Android Studio at D:\Programs\AndroidStudio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
X Unable to determine bundled Java version.
• Try updating or re-installing Android Studio.
[√] VS Code, 64-bit edition (version 1.50.1)
• VS Code at C:\Program Files\Microsoft VS Code
• Flutter extension version 3.17.0
[√] Connected device (4 available)
• sdk gphone64 x86 64 (mobile) • emulator-5554 • android-x64 • Android 12 (API 32) (emulator)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.19043.1586]
• Chrome (web) • chrome • web-javascript • Google Chrome 100.0.4896.88
• Edge (web) • edge • web-javascript • Microsoft Edge 99.0.1150.46
[√] HTTP Host Availability
• All required HTTP hosts are available
Here's the part that keeps getting me. I'm seeing I need to run flutter doctor --android-licenses and this is what I get:
PS D:\Documents\Flutter_Projects\glance> flutter doctor --android-licenses
Error: Could not find or load main class Files
I have no clue where to go from here. Any help would be greatly appreciated here. Thank you in advance.

It appears that you have two sets of Android Studio and Android SDK.
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at C:\Program Files (x86)\Android\android-sdk <--- 1
...
• ANDROID_HOME = C:\Users\reff1\AppData\Local\Android\Sdk <--- 2
[√] Android Studio (version 2021.1) <--- 1
• Android Studio at D:\AndroidStudio
...
[!] Android Studio (version 4.1) <--- 2
• Android Studio at D:\Programs\AndroidStudio
Android Studio version 4.1 is a bit older so I guess you installed it in the past and forgot about it.
Also, it is not normal (or up-to-date) to have Android SDK placed under Program Files.
This is the direct cause of the error. In Windows, writing files under Program Files requires administrator privileges.
Your system is possibly confused because you have a mixed environment with an SDK that requires administrator privileges and one that does not.
My advice is to first uninstall all of them.
Before you begin, find out where the Android Studio configuration files are stored and backup them.
It is documented in here.
Now, completely uninstall all versions of Android Studio and Android SDK, manually delete all environment variables related to Android if any, manually delete (and backup) all configuration files if the uninstaller did not, then make sure all four directories above are empty.
Next, install the latest version of Android Studio and install the Android SDK via Android Studio. At this point, make sure that the installation directory is not under Program Files or Program Files (x86). If it is, then something in the older version is still there and is doing bad things so you have to restart from the first step.
Finally, run flutter clean (just to be sure), then flutter doctor to make sure only one of each is detected.

In android studio update your sdk 30

Unable to determine bundled Java version.
• Try updating or re-installing Android Studio
See in your error in flutter doctor

Change the ownership of Android SDK:
sudo chown -R $(whoami) $ANDROID_HOME

For this issue : Android license status unknown.
Type in command prompt
flutter doctor --android-licenses
Type Yes/y/Y to accept licenses

Maybe it's an emulator specific issue, did you try to run it on a real device?
Regarding the android license issue you are getting, I guess that the system is not recognizing JAVA or it needs to be updated so please check that.
Also make sure that the emulator itself is updated and not only the android SDK, go to SDK manager and check all the dashed components:
If this didn't work, delete the emulator and create a new one, and if that didn't help, delete all instances of android studio as I see 2 on your system that might conflict the SDK path.

Develop Flutter web app on Windows Subsystems for Linux

I'm trying to develop web app with flutter on WSL2. However I could not get it work with chrome.
[✓] Flutter (Channel stable, 2.2.3, on Linux, locale C.UTF-8)
• Flutter version 2.2.3 at /home/rayl/development/flutter
• Framework revision f4abaa0735 (4 weeks ago), 2021-07-01 12:46:11 -0700
• Engine revision 241c87ad80
• Dart version 2.13.4
[!] Android toolchain - develop for Android devices
• Android SDK at /home/rayl/development/android/sdk
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, please use
`flutter config --android-sdk` to update to that location.
• ANDROID_HOME = /home/rayl/development/android/sdk
✗ No valid Android SDK platforms found in /home/rayl/development/android/sdk/platforms. Directory was empty.
• Try re-installing or updating your Android SDK,
visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions.
[✗] Chrome - develop for the web (Cannot find Chrome executable at /mnt/c/Program\ Files\/Google\/Chrome\/Application/chrome.exe)
! /mnt/c/Program\ Files\/Google\/Chrome\/Application/chrome.exe is not executable.
[!] Android Studio (not installed)
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.dev/docs/get-started/install/linux#android-setup for detailed instructions).
[!] Connected device
! No devices available
if i run /mnt/c/Program\ Files/Google/Chrome/Application/chrome.exe on cmdline. It will open chrome on windows side. but flutter doctor say its not executable.

ERROR: JAVA_HOME is not set and no 'java' command could be found in your flutter PATH. In Flutter

I installed Android Studio 4.1 and tried to run the existing project. But it gives an error like this:
ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation.

You have to set the JAVA_HOME Environment Variable.
On Windows, I solved the issue as follows:
Download the Java JDK from here and install it. (This links to version 15, which requires you to create an account in order to download. Version 16 is available to download without creating an account, but it has caused me an error that required me to downgrade.)
Set the "JAVA_HOME" Environment Variable:
Open Windows Search, type in “env”, and choose “Edit the system environment variables”.
Click on "Environment Variables...".
Click on "New".
Fill in the "variable name" field with "JAVA_HOME".
Fill in the "variable value" with the path to where Java is installed on your computer. (for me it was under "C:\Program Files\Java\<jdkversion>".)
Click "OK" and close all dialogs.
Restart your IDE / Terminal. (do not skip this step)

On Ubuntu 20.04 with Android 4.1, this error can be solved using the Snap version with:
flutter config --android-studio-dir=/snap/android-studio/current/android-studio

For Windows :
flutter config --android-studio-dir="C:\Program Files\Android\Android Studio"
This command works fine if you have Android Studio installed. Flutter can understand the configurations of the Android Studio and you don't have to provide JAVA_HOME anymore.
Edit (Bonus) :
Also, download "Android SDK Command-line Tools" in android studio for android-licenses. Steps are shown in the image below.

You need to install Java JDK software which is required for the android studio.
sudo apt install openjdk-11-jdk

UPDATE: run flutter upgrade to upgrade to Flutter 1.22.2, which fixes compatibility issues with Android Studio 4.1. See related Flutter release.
This issue has been resolved v
See this issue regarding Android Studio 4.1 and Flutter
You can either downgrade back to Android Studio 4.0.2 or you can
install the latest JDK and update your JAVA_HOME variable and
PATH (OS dependent).
Note that if you choose to continue using 4.1 instead of downgrading,
flutter doctor will tell you Android Studio is not installed.
You need to run flutter config --android-studio-dir='<path to android studio>' in order to fix this issue. flutter doctor will now also
incorrectly report that the Flutter and Dart plugins are not
installed even if they are - you can ignore this.

Install Android Studio (skip this step if you already installed)
Goto
C:\Program Files\Android\Android Studio\jre and copy the path.
Make New variable called "JAVA_HOME". And paste above path as the variable value.

I set my JAVA HOME to the path,
/snap/android-studio/97/android-studio/jre/
Then I set my android studio config in flutter by using this command:
flutter config --android-studio-dir=/snap/android-studio/current/android-studio
My system is :
Ubuntu 20.04 with Flutter plugin version as 4.1,

In Mac:
In your terminal run
ECHO $JAVA_HOME
This will bring up the current path of java home.Pay close attention to the path that the terminal outputs.In my case i had System/Library instead of /Library/.../... typo as my path.So i simply corrected this in bash_profile.
If your path is correct but the error persists,
Right Click On Finder
Go To Folder
Bash_Profile
Add or Edit the Java Home Path
The path you add here should be the one your terminal output when you ran Echo $Java_Home..As long as this path that was echoed was/is correct..the below steps should fix the issue.
Then open your zshrc in a similar manner as you did with bash_profile and add the home path to the file.
You can also edit the bash_profile and zshrc files in your text editor.These files can be displayed using cmd + shift + . in your home folder.
After that,save,exit the terminal, close android studio and restart your machine.
Read this Article to learn more.

Locate where your Android Studio is installed.
For me C:\Program Files\Android\Android Studio
Check if the jre folder exists, Create a new folder called jre
Copy the contents of the jbr folder and paste them into the jre folder.
Check by running flutter doctor, and Restart IDE.
Thanks: roufy235 {cause}

For ubuntu 20.04 this solution will be appropriate: -
This link solved my problem. In short I would recommend to follow the simple steps, i.e.
Upgrade the flutter using flutter upgrade
Set the path of the flutter flutter config --android-studio-dir="/path/to/android/studio/"
Set the path in bashrc file by opening bashrc file(it is a hidden file)
export JAVA_HOME="/path/to/android/studio/jre/"

choco install javaruntime
If you use choco package manager. It will set the vars automatically.

This issue can also be caused if you have updated your Android Studio.
In that case.
For Windows
First Open the Users\username\AppData\Local\Google directory on your PC/Laptop and make sure to Delete the older version of your Android Studio.
e.g, Current version of Android studio is Electric Eel (2022.1).
Delete any other older version from that directory accordingly and restart your PC or Laptop.
Then try running your project.

Install openjdk-8 ....
You have to restart your terminal, the issue will persist even after download if you don't restart the terminal.
Follow react native guide to download openjdk for your environment. ...
https://reactnative.dev/docs/environment-setup

For Windows this worked
Go to C:\Program Files\Android\Android Studio.
Copy all the files inside of jbr directory.
Paste all the files into jre directory.
Then run flutter doctor. The issue will go away.
D:\Flutterproject\rechyriedapp>flutter doctor -v
[√] Flutter (Channel stable, 3.3.8, on Microsoft Windows [Version 10.0.22621.1105], locale en-IN)
• Flutter version 3.3.8 on channel stable at C:\flutter_windows_3.3.8\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 52b3dc25f6 (3 months ago), 2022-11-09 12:09:26 +0800
• Engine revision 857bd6b74c
• Dart version 2.18.4
• DevTools version 2.15.0
[!] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
• Android SDK at C:\Users\USER\AppData\Local\Android\Sdk
• Platform android-TiramisuPrivacySandbox, build-tools 33.0.0
X No Java Development Kit (JDK) found; You must have the environment variable JAVA_HOME set and the java binary in your PATH. You can download the JDK from https://www.oracle.com/technetwork/java/javase/downloads/.
[√] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop for Windows (Visual Studio Community 2022 17.4.4)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.4.33213.308
• Windows 10 SDK version 10.0.22000.0
[!] Android Studio (version 2022.1)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
X Unable to find bundled Java version.
• Try updating or re-installing Android Studio.
[√] Connected device (4 available)
• CPH2095 (mobile) • 86db9605 • android-arm64 • Android 12 (API 31)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.22621.1105]
• Chrome (web) • chrome • web-javascript • Google Chrome 109.0.5414.120
• Edge (web) • edge • web-javascript • Microsoft Edge 109.0.1518.55
[√] HTTP Host Availability
• All required HTTP hosts are available
! Doctor found issues in 2 categories.
After that copy all file from jbr to jre
D:\Flutterproject\rechyriedapp>flutter doctor -v
[√] Flutter (Channel stable, 3.3.8, on Microsoft Windows [Version 10.0.22621.1105], locale en-IN)
• Flutter version 3.3.8 on channel stable at C:\flutter_windows_3.3.8\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 52b3dc25f6 (3 months ago), 2022-11-09 12:09:26 +0800
• Engine revision 857bd6b74c
• Dart version 2.18.4
• DevTools version 2.15.0
Checking Android licenses is taking an unexpectedly long time...[√] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
• Android SDK at C:\Users\USER\AppData\Local\Android\Sdk
• Platform android-TiramisuPrivacySandbox, build-tools 33.0.0
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-8887301)
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop for Windows (Visual Studio Community 2022 17.4.4)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.4.33213.308
• Windows 10 SDK version 10.0.22000.0
[√] Android Studio (version 2022.1)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-8887301)
[√] Connected device (4 available)
• CPH2095 (mobile) • 86db9605 • android-arm64 • Android 12 (API 31)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.22621.1105]
• Chrome (web) • chrome • web-javascript • Google Chrome 109.0.5414.120
• Edge (web) • edge • web-javascript • Microsoft Edge 109.0.1518.55
[√] HTTP Host Availability
• All required HTTP hosts are available
• No issues found!

Download Liberica JDK and on installation it will automatically set JAVA_HOME environment variable.
Now you just go to Android Studio -> Project Structure -> SDK -> Point all jdk path to liberica jdk installation directory and apply.
You are done. Just restart android studio and gradle command will work.

Device not applicable for the “main.dart” configuration

Before anyone points me to this link I would like to mention, that I don't think these are directly related.
As one can see my flutter doctor -v command is error free:
➜ flutter git:(stable) flutter doctor -v
[✓] Flutter (Channel stable, v1.12.13+hotfix.9, on Mac OS X 10.15.3 19D76, locale en-US)
• Flutter version 1.12.13+hotfix.9 at /Users/johannes/.flutter-cli/flutter
• Framework revision f139b11009 (5 weeks ago), 2020-03-30 13:57:30 -0700
• Engine revision af51afceb8
• Dart version 2.7.2
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
• Android SDK at /Users/johannes/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 11.4.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.4.1, Build version 11E503a
• CocoaPods version 1.8.4
[✓] Android Studio (version 3.6)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 45.1.1
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
[✓] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)
• No issues found!
Yet I to have the issue of a grayed out emulator device with the message Device not applicable for the “main.dart” configuration like this:
I can now only start the emulator using the dropdown menu <no device> like this:
Interestingly I am then actually able to run my app on the device, while the device is still grayed out:
Flutters hot-reloading feature seems to not work properly though.
I have already added the main folder to the project as suggested here and I also made sure to change NO SDK to ANDROID API PLATFORM as suggested in the same link. All dependencies in Project Structure > Modules are found by Android Studio. I cloned the Flutter SKD from the stable branch on GitHub.
Does anyone have an idea why my setup is behaving this way?

Close Android Studio and Run again as Administrator

It solved my problem:
1- Make sure Flutter plugin is installed in android studio, you can install the plugin from file > setting > plugin
2- choose flutter SDK path from File > setting> Language & Framework > flutter.

I have the same issue before.
Uninstall Flutter and Dart plugin from Android Studio then reinstall Flutter (Dart will be installed automatically)
Remove created emulators from AVD Manager and create new one
Try making new project, and set SDK version same as emulators API version or lower from File > Project Structure...
Hopefully worked for you.

When I want to create a new flutter project, flutter just returns to the welcome screen

I have already installed Flutter and Dart plugins in Android Studio. I go through all the stages of creating a Flutter project but when I click on Finish I get the dialog "creating a new flutter project" but after a few seconds the welcome screen keeps showing up and I'm back at square one. Can anyone help, please?
Here's the information of "flutter doctor -v" command:
CreateProcessW failed 87
[!] Flutter (Channel stable, v1.12.13+hotfix.8, on Microsoft Windows [Version 10.0.18362.418], locale en-US)
• Flutter version 1.12.13+hotfix.8 at C:\src\flutter
• Framework revision 0b8abb4724 (4 weeks ago), 2020-02-11 11:44:36 -0800
• Engine revision e1e6ced81d
• Dart version 2.7.0
X Downloaded executables cannot execute on host.
See https://github.com/flutter/flutter/issues/6207 for more information
[X] Android toolchain - develop for Android devices
X Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/setup/#android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, set ANDROID_HOME to that location.
You may also want to add it to your PATH environment variable.
[√] Android Studio (version 3.6)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 44.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
[!] Connected device
! No devices available
! Doctor found issues in 3 categories.

It seems that you have a problem with Flutter installation. You can try to reinstall it (make sure you get version for your OS).
The second problem is with Android SDK. Installing Android Studio is not enough. Try going through this setup instructions: https://flutter.dev/docs/get-started/install#android-setup.