Android Gradle usa Ali Mirror

Modifique google () y jcenter () para

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

El archivo gradle modificado es el siguiente:

buildscript {
    repositories {
        maven{url 'https://maven.aliyun.com/repository/public'}
        maven{url 'https://maven.aliyun.com/repository/google'}

//        google()
//        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.0"

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

allprojects {
    repositories {
        maven{url 'https://maven.aliyun.com/repository/public'}
        maven{url 'https://maven.aliyun.com/repository/google'}

//        google()
//        jcenter()
    }
}

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

Otros espejos maven:

• Espejo maven de Alibaba Cloud: https://maven.aliyun.com/mvn/guide