uildscript {
    repositories {
//        jcenter()
//        google()
        maven { url 'https://maven.aliyun.com/nexus/content/repositories/google' }
        maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        maven{ url 'http://maven.aliyun.com/nexus/content/repositories/jcenter'}
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.2.1'

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

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

 

把jcenter和google()注释掉，其他地方把这三句话加进去