build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    
    repositories {
        google()

        maven{url 'http://maven.aliyun.com/nexus/content/groups/public/'}
//        jcenter()
        jcenter(){ url 'http://jcenter.bintray.com/'}
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'
//        classpath 'com.jakewharton:butterknife-gradle-plugin:9.0.0-rc2'

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

allprojects {
    repositories {
        google()

        maven{url 'http://maven.aliyun.com/nexus/content/groups/public/'}
//        jcenter()
        jcenter(){ url 'http://jcenter.bintray.com/'}
    }
}

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