215-settings.gradle 设置中国国内的镜像

buildscript {
    repositories {
        // 将原来的 mavenCentral() 注释或删除
        // mavenCentral()
        
        // 添加国内镜像源
        maven { url 'https://maven.aliyun.com/repository/google' }
        maven { url 'https://maven.aliyun.com/repository/jcenter' }
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public' }
    }
    // ...
}

allprojects {
    repositories {
        // 将原来的 mavenCentral() 注释或删除
        // mavenCentral()

        // 添加国内镜像源
        maven { url 'https://maven.aliyun.com/repository/google' }
        maven { url 'https://maven.aliyun.com/repository/jcenter' }
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public' }
    }
    // ...
}