1，解决依赖镜像问题
buildscript {
repositories {
mavenCentral()
google()
// jcenter()
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:3.0.1'
}
}
