Flutter项目Gradle构建失败：找不到Properties()方法求助

错误信息 #

FAILURE: Build failed with an exception.

* Where:
Build file 'E:\new epads\epads-ppra-epads.mobileapplication.flutter-c9460f2b2f3c\android\app\build.gradle' line: 1

* What went wrong:
A problem occurred evaluating project ':app'.
> Could not find method Properties() for arguments [] on project ':app' of type org.gradle.api.Project.

* 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 1s

解决方案 #

• 修正app/build.gradle语法
  打开android/app/build.gradle，把第一行的def localProperties = Properties()改成def localProperties = new Properties()。Gradle 7.x及以上版本不再默认导入java.util.Properties，必须显式用new关键字实例化。

• 匹配Gradle与Flutter版本
  Flutter 3.3.0推荐搭配Gradle 7.4.2，修改android/gradle/wrapper/gradle-wrapper.properties里的distributionUrl：

  distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-all.zip
  

• 同步Android Gradle Plugin版本
  打开android/build.gradle，在buildscript -> dependencies下，将Android Gradle Plugin版本改为7.4.2（与Gradle版本匹配）：

  classpath 'com.android.tools.build:gradle:7.4.2'
  

• 清理缓存重新构建
  执行命令清理缓存：

  flutter clean
  

  手动删除android/.gradle文件夹，再运行flutter run重新构建项目。

内容的提问来源于stack exchange，提问作者Waheed Ullah