运行应用时报错“$flutterSdkpath\packages\flutter_tools\gradle\app_plugin_loader.gradle”

Question

I am facing an issue while running the app. My flutter details are:

Flutter Version: 1.12.13+hotfilx.9

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.12.13+hotfix.9, on Microsoft Windows [Version 10.0.17763.1098], locale en-IN)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.0-rc2)
    X Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.[√] Android Studio (version 3.6)
[√] VS Code (version 1.44.2)
[√] Connected device (1 available)
! Doctor found issues in 1 category.

While running the flutter run in visual studio it is showing this:

Launching lib\main.dart on CPH1859 in debug mode...

FAILURE: Build failed with an exception.

* Where:
Settings file 'project_name\android\settings.gradle' line: 15

* What went wrong:
A problem occurred evaluating settings 'android'.
> Could not read script '\flutter\packages\flutter_tools\gradle\app_plugin_loader.gradle' as it does not exist.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 2s
Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

Thanks in advance for helping me.

Answer 1

Flutter projects created on the master channel will generate an android/settings.gradle file that points to a file in the Flutter tool that's present in 1.18.0-dev.5.0 ( currently available on all channels ).

Switching from master -> stable "downgrades" Flutter relative to that change, and the file is no longer present.

You can work around this by regenerating your android/settings.gradle while on stable:

$ rm android/settings.gradle
$ flutter create .

See the GitHub issue for more details.

Answer 2

Just replace the current setting.gradle file code with you wanna running version project setting.gradle. eg: Other version project: android>setting.gradle

This code will be your current flutter version just replace your setting.gradle with old one or other project

Settings.gradle

include ':app' 

def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()

def plugins = new Properties()
def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
if (pluginsFile.exists()) {
   pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
}

plugins.each { name, path ->
   def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
   include ":$name"
   project(":$name").projectDir = pluginDirectory
}

Answer 3

Just downgrade the recent library/package you used and you'll be just fine

Answer 4

Changing the channel from stable to master worked for me.

To view the channel:

flutter channel

To change the channel:

flutter channel <channel_name>

eg flutter channel master

Answer 5

JUST go to the path sdk flutter path

$flutterPath\packages\flutter_tools\gradle\app_plugin_loader.gradle

and ensure the file app_plugin_loader is there, if not restore it from recycle bin or download it