只需要將build.gradle改成以下就好，下載速度 sui sui sui的

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
}
 

參考於https://blog.csdn.net/jiang25810/article/details/83503829，非常感謝了

關於 android studio 3.2打開後一直下載中，最後還失敗了 的解決方法