更新gradle太慢，来个阿里云
buildscript{
repositories {
maven{
url
‘http://maven.aliyun.com/nexus/content/groups/public/’
}
jcenter()
}
dependencies {
classpath
‘com.android.tools.build:gradle:2.3.3’
}
}
allprojects {
repositories {
jcenter()
maven{
url
‘http://maven.aliyun.com/nexus/content/groups/public/’
}
}
}