Develop Reference

Flutter Android build not working in existing app on fresh Linux install

I have an existing flutter app (on GitHub here) that is working fine on my Windows 11 and MacOS machines, and was previously working on my Linux machine.
I installed a new distro a few days ago (OpenSUSE Tumbleweed) and now can't get the Android build to work. It fails with various errors depending on what stage of trying out different SDK version, etc., but the current error I'm on (after deleting everything and pulling it all down fresh) is:
Execution failed for task ':app:dependencies'.
> Could not resolve all dependencies for configuration ':app:androidApis'.
> Could not create task ':app:generateDebugLintModel'.
> java.lang.NullPointerException (no error message)
and also the below error a bit further down:
* Where:
Script '/home/jackv/bin/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 157
* What went wrong:
Execution failed for task ':tasks'.
> Could not create task ':generateLockfiles'.
> Process 'command '/home/jackv/Development/ComicWrap-F/android/gradlew'' finished with non-zero exit value 1
The weird thing is that creating a new project with flutter create --platform=android test_project results in a project that can build, but even if I go line by line and make sure all the build.gradle, .properties files, etc. are all the same it still doesn't work for my existing app.
I'm at a loss because the exact project files in the git repo were working totally fine on all platforms until I tried to start fresh on OpenSUSE.
My flutter doctor -v:
[✓] Flutter (Channel stable, 3.0.2, on openSUSE Tumbleweed 5.18.4-1-default, locale en_AU.UTF-8)
• Flutter version 3.0.2 at /home/jackv/bin/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision cd41fdd495 (10 days ago), 2022-06-08 09:52:13 -0700
• Engine revision f15f824b57
• Dart version 2.17.3
• DevTools version 2.12.2
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
• Android SDK at /home/jackv/Android/Sdk
• Platform android-33, build-tools 33.0.0
• Java binary at: /home/jackv/bin/android-studio/jre/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
• All Android licenses accepted.
[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✗] Linux toolchain - develop for Linux desktop
✗ clang++ is required for Linux development.
It is likely available from your distribution (e.g.: apt install clang), or can be downloaded from https://releases.llvm.org/
✗ CMake is required for Linux development.
It is likely available from your distribution (e.g.: apt install cmake), or can be downloaded from https://cmake.org/download/
✗ ninja is required for Linux development.
It is likely available from your distribution (e.g.: apt install ninja-build), or can be downloaded from https://github.com/ninja-build/ninja/releases
• pkg-config version 1.8.0
✗ GTK 3.0 development libraries are required for Linux development.
They are likely available from your distribution (e.g.: apt install libgtk-3-dev)
[✓] Android Studio (version 2021.2)
• Android Studio at /home/jackv/bin/android-studio
• Flutter plugin version 68.1.2
• Dart plugin version 212.5744
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
[✓] VS Code (version 1.68.1)
• VS Code at /usr/share/code
• Flutter extension version 3.42.0
[✓] Connected device (1 available)
• Linux (desktop) • linux • linux-x64 • openSUSE Tumbleweed 5.18.4-1-default
[✓] HTTP Host Availability
• All required HTTP hosts are available
! Doctor found issues in 2 categories.

So turns out I didn't follow my own README, my local.properties file was missing the required adMob.appId entry.
I found the error by opening the AndroidManifest.xml project in Android Studio and looking at the errors in the "Merged" tab!

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.

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.

"flutter run" gets stuck at "Running Gradle task 'assembleDebug"

I updated Flutter to the latest stable version today - 1.12.13+hotfix.7 (I was running 1.12.13+hotfix.6 before). When I tried to run my project in vs code with flutter run it always gets stuck at Running Gradle task 'assembleDebug:
Have anyone experienced the same issue?
Here is the output of flutter doctor -v:
[georgi#georgi-pc Line-up-Generator]$ flutter doctor -v
[✓] Flutter (Channel stable, v1.12.13+hotfix.7, on Linux, locale en_GB.UTF-8)
• Flutter version 1.12.13+hotfix.7 at /home/georgi/Development/flutter
• Framework revision 9f5ff2306b (2 weeks ago), 2020-01-26 22:38:26 -0800
• Engine revision a67792536c
• Dart version 2.7.0
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at /home/georgi/Android/Sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.2
• Java binary at: /opt/android-studio/jre/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[!] Android Studio (version 3.5)
• Android Studio at /opt/android-studio
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[✓] Connected device (1 available)
• MI 8 • 62fb6fd8 • android-arm64 • Android 10 (API 29)
! Doctor found issues in 2 categories.
I have to point out that I have tried running flutter doctor --android-licenses but it gets stuck at 25%
Note: I am on Manjaro 18.1.5
UPDATE:
There seems to be an issue with Dart SDK: https://github.com/flutter/flutter/issues/49185#issuecomment-589968058

flutter clean worked for me
I had the same issue. I tried so many solutions and finally found on Github. Try this command in the terminal.

The issue has been resolved upstream. If you want to consume it you will have to switch to the master channel (for now. It will arrive in the stable channel at some point) by running
flutter channel master
After running that, I was able to build my apk just fine on Linux 5.5

I had the same problem and solved it.
I ran flutter doctor --android-licenses as sudo.
I used the whole path, don't know if that's necessary though.
For example I did it like that:
sudo /home/jan/development/languages+devtools/flutter/bin/flutter doctor --android-licenses
After that everything worked.

I tried every answer I found about it, but none of them worked.
Finally I fixed it by deleting the Android Virtual Device I had and creating a new one. In my case looks like it was a problem with the android emulator rather than a flutter bug.

Error ":app:transformClassesWithDexBuilderForDebug" when upgrade to new version of flutter

I upgrade flutter from v1.91. hotfix 6 by using flutter upgrade --force.
Then i build an example "layers" - flutter run, it shows this message, while if i switch to 1.91, everything built ok
flutter run --stacktrace gives this error
Could not find an option named "stacktrace".
flutter doctor -v
G:\new\new_exam>flutter doctor -v [√] Flutter (Channel stable,
v1.12.13+hotfix.5, on Microsoft Windows [Version 10.0.18362.535],
locale en-US) • Flutter version 1.12.13+hotfix.5 at G:\Flutter\flutter
• Framework revision 27321eb (12 days ago), 2019-12-10 18:15:01 -0800
• Engine revision 2994f7e1e6 • Dart version 2.7.0
[√] Android toolchain - develop for Android devices (Android SDK
version 29.0.2) • Android SDK at G:\Flutter\android • Android NDK
location not configured (optional; useful for native profiling
support) • Platform android-29, build-tools 29.0.2 • ANDROID_HOME =
G:\Flutter\android • ANDROID_SDK_ROOT = G:\Flutter\android\sdk • Java
binary at: G:\flutter\openjdk\bin\java • Java version OpenJDK Runtime
Environment (build 1.8.0_232-b09) • All Android licenses accepted.
[!] Android Studio (not installed) • Android Studio not found;
download from https://developer.android.com/studio/index.html (or
visit https://flutter.dev/setup/#android-setup for detailed
instructions).
[!] IntelliJ IDEA Community Edition (version 2019.3) • IntelliJ at
C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.3.1 X
Flutter plugin not installed; this adds Flutter specific
functionality. X Dart plugin not installed; this adds Dart specific
functionality. • For information about installing plugins, see
https://flutter.dev/intellij-setup/#installing-the-plugins
[!] Connected device ! No devices available
! Doctor found issues in 3 categories.
1: https://i.stack.imgur.com/B4DTX.png

I feel the solution is pretty straight forward. Usually, it's always a best practice to use Android Studio when working with Flutter and Dart. Reasons are there are some dependencies that would require you to use Android Studio to have it work well for you, especially when you're just starting to work with Flutter and Dart.
Flutter Doctor is pretty precise as to the issues you're experiencing.
After downloading Android Studio, do the following;
Navigate to your Preferences or Android Studio Settings on PC, then select, Plugins, ensure the following plugins are installed.
Android APK Support
Android NDK Support
Dart
Flutter
EditorConfig
App Links Assistant
Google Services
Gradle
Properties Support
Java Bytecode Decompiler
Java Stream Debugger
Task Management
YAML
Among others which would be automatically installed by Android Studio for you, this should take that error away and you should be fine.
Then, before you probably run your App, if you see the get dependencies at the Top of your Android Studio, click the get dependencies so that Android studio can get the latest dependencies to run your App without issues.
Ensure you run a cold restart after each time you add a new dependency to your pubspec.yaml file.