buildscript?{
????
????repositories?{
????????maven?{
????????????url'http://maven.aliyun.com/nexus/content/groups/public/'
????????}
????????google()
????????jcenter()
????}
????dependencies?{
????????classpath?'com.android.tools.build:gradle:3.1.2'
????????classpath?"io.realm:realm-gradle-plugin:5.12.0"
????????

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

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

我是這樣引用的，正常的，你對比看看是不是哪里路徑寫錯了，比如說有空格