Could not resolve com.android.support:multidex:1.0.2.

情境

将Android Studio从较低版本升级到3.0.1（或者更高），报出Could not resolve com.android.support:multidex:1.0.2错误。

解决方式

在project的build.gradle的buildscript和allprojects的repositories中里添加阿里云的maven镜像

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

添加完之后大概是如下样子

buildscript {

    repositories {
        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:3.1.3'
    }
}

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

添加好之后编译运行即可。