关于 android studio 3.2打开后一直下载中，最后还失败了 的解决方法

buildscript {
    
    repositories {
        maven{
            url ‘http://maven.aliyun.com/nexus/content/groups/public/‘
        }
        mavenCentral();
        google()
        jcenter()
    }
    dependencies {
        classpath ‘com.android.tools.build:gradle:3.2.0‘
        

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        maven{
            url ‘http://maven.aliyun.com/nexus/content/groups/public/‘
        }
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}