Flutter project :app > project :XXXX或Could not resolve com.android.tools.build:gradle:3.5.0

Flutter报错：Required by: project :app > project :XXXX

或

Flutter报错：Could not resolve com.android.tools.build:gradle:3.5.0

修改步骤（笔者使用的mac）：

1.修改镜像(app/build.gradle)

maven{ url https://maven.aliyun.com/repository/google }

maven{ url https://maven.aliyun.com/repository/jcenter }

maven{ url http://maven.aliyun.com/nexus/content/groups/public }

mavenLocal()

mavenCentral()

project :XXXX或Could not resolve com.android.tools.build:gradle:3.5.0″>

2.同步修改flutter.gradle文件（文件路径在flutter安装路径/packages/flutter_tools/gradle

/flutter.gradle）不清楚安装路径可以在设置中查看到；

project :XXXX或Could not resolve com.android.tools.build:gradle:3.5.0″>

3.删除gradle.properties文件（文件路径在用户/.gradle/）

project :XXXX或Could not resolve com.android.tools.build:gradle:3.5.0″>

以上主要参考：

https://www.jianshu.com/p/0b4f2ffeb1f1

https://www.jianshu.com/p/6cd9cdab70b1

感谢！