如何将flutter_local_notifications添加到我的应用程序？

Question

I wanna add notification in my app with flutter_local_notifications but once I add the plugin to my .yaml, my app doesn't run again. Below is the error

```D8: Program type already present: android.support.v4.app.INotificationSideChannel

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.

  com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/2.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/3.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/6.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/7.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/8.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/9.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/10.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/11.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/ app/intermediates/transforms/dexBuilder/debug/12.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/13.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/14.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/15.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/16.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/17.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/18.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/19.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/20.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms /dexBuilder/debug/21.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/22.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/23.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/24.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/25.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/26.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/27.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/28.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/29.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/30.jar, /U sers/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/31.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/32.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/33.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/34.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/35.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/36.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/37.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/38.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/39.jar, /Users/macbook/AndroidStudioPr ojects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/40.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/41.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/42.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/43.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/44.jar, /Users/macbook/AndroidStudioProjects/restaurant/build/app/intermediates/transforms/dexBuilder/debug/45.jar Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes . Program type already present: android.support.v4.app.INotificationSideChannel

• 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 29s

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The Gradle failure may have been because of AndroidX incompatibilities in this Flutter app. See ... for more information on the problem and how to fix it.

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Finished with error: Gradle task assembleDebug failed with exit code 1```

Thanks.

Answer 1

First you need to upgrade all the packages that you have to the version where they are compatible with AndroidX . You can know that from the ChangeLog.md of each package on the dart packages page . Next you need to open the android project of your flutter in AndroidStudio , then select Refactor -> Migrate to AndroidX . Wait a bit until android studio refactors your project. And the run rebuild project from android studio. It should work then!