Flutter 3.27.1 -> Android -> Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.

[stevo-knievo]

I attempted to follow the example provided in the move_to_background package documentation using a fresh Flutter app created with version 3.27.1. When running the app on an Android Emulator, the build fails with the following error:

Support for Android x86 targets will be removed in the next stable release after 3.27. See https://github.com/flutter/flutter/issues/157543 for
details.

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':move_to_background'.
> Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
   > Namespace not specified. Specify a namespace in the module's build file. See https://d.android.com/r/tools/upgrade-assistant/set-namespace for information about setting the namespace.

     If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP Upgrade Assistant.

* 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 636ms
Running Gradle task 'assembleDebug'...                           1,123ms
Gradle task assembleDebug failed with exit code 1

Steps to Reproduce

• Create a fresh Flutter app using flutter create (Flutter 3.27.1).
• Add move_to_background as a dependency in pubspec.yaml.
• Follow the example provided in the package documentation: example on pub.dev.
• Attempt to build and run the app on an Android Emulator (flutter run or flutter build apk --debug).

Expected Behavior
The app should build and run successfully, demonstrating the functionality of the move_to_background package.

Actual Behavior
The build fails with the error message above, referencing a missing namespace configuration in the module's build file.

Additional Context

• Flutter version: 3.27.1
• Android Emulator: Pixel 5, API 33
• Dart version: 3.3.x

[khyatikasundra]

Add this line in your android level build.gradle file:-

subprojects {
    // add this line for move_to_background to work in android device
    afterEvaluate {
        android {
            compileSdkVersion 34
          }
    }
}

[giovannicampagnolo]

it din't work this workaround

[sunjiaming]

It happened to me, too, waiting to be resolved

[alaindeseine]

If you need a working version of this package, you can check https://github.com/alaindeseine/move_to_background.

I have updated the package in order to compile with flutter 3.29.3