Android 颤振生成失败，D8:程序类型已存在_Android_Gradle_Dart_Flutter

Android 颤振生成失败，D8:程序类型已存在

android gradle dart flutter

Android 颤振生成失败，D8:程序类型已存在,android,gradle,dart,flutter,Android,Gradle,Dart,Flutter,我正在开发一个颤振应用程序我发现了一个样本颤振项目，所以它。但是这个项目。。。生成失败，出现以下日志消息 FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:preDebugBuild'. > Android dependency 'androidx.core:core' has different version for the compile (1.

我正在开发一个颤振应用程序

我发现了一个样本颤振项目，所以它。但是这个项目。。。生成失败，出现以下日志消息

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:preDebugBuild'.
> Android dependency 'androidx.core:core' has different version for the compile (1.0.0) and runtime (1.0.1) classpath. You should manually set the same version via DependencyResolution

* 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 0s
*******************************************************************************************
The Gradle failure may have been because of AndroidX incompatibilities in this Flutter app.
See https://flutter.dev/docs/development/packages-and-plugins/androidx-compatibility for more information on the problem and how to fix it.
*******************************************************************************************
Finished with error: Gradle task assembleDebug failed with exit code 1

这个项目并不特别。对于android部分，没有其他修改。这与“新颤振项目”完全相同

我试过一些东西：

迁移到AndroidX

这是失败的错误弹出。我试图迁移使用“重构>迁移到android x”，但它显示错误弹出。错误弹出窗口告诉我使用CompileSDK版本至少28。但是我已经用了28.我该怎么办

将渐变版本从3.2.1更改为3.3.2

但生成失败，日志不同

Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
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: 
  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

我不知道我该怎么办

这让我很累。。。

我只想编码…

我通过以下链接解决此问题：

有两个迁移指南