问题描述：
What went wrong:
Execution failed for task ':fluttertoast:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
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BUILD FAILED in 26s
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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.
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Finished with error: Gradle task assembleDebug failed with exit code 1
解决办法：项目中找到yaml的文件（就是flutter中集成框架的文件）
更改fluttertoast的版本号为^3.1.0
