当我运行flutter应用程序时，我已经安装了所有版本的构建工具30
警告:映射新的ns http://schemas.android.com/repository/android/generic/02到旧的ns http://schemas.android.com/repository/android/generic/01警告:将新ns http://schemas.android.com/sdk/android/repo/addon2/02映射到旧ns http://schemas.android.com/sdk/android/repo/addon2/01
我删除了android sdk中的平台并重新安装，现在工作正常!
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