Adnroid Studio3.2.1 引发的问题Failed to resolve: multidex

今天把Android Studio 升级到了3.2.1版本，抛出了异常Failed to resolve: multidex 异常。配置如下：

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4'
        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()

        maven {
            url 'http://maven.aliyun.com/nexus/content/repositories/releases/'
        }

        maven { url 'https://maven.google.com' }

        maven { url "https://jitpack.io" }
    }
}

查了一些资料得知 Android stuido 3.0.0以后 gradle.build 配置中默认增加了 google() 这个仓库，而且==google() 这个仓库位置必须放到第一位==，否则，会出现Failed to resolve: multidex 下载multidex 库失败的问题。故修改如下：

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4'
        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()

        maven { ......}

        maven { ..... }
    }
}

解释

google() 这个meven 仓库方法必须是 gradle 4.1 and Android Gradle plugin 3.0.0 以上版本才会有，如果 是3.0.0以下用 maven { url 'maven.google.com' }

官方文档链接如下：developer.android.com/studio/rele…

buildscript {
    repositories {
        // Gradle 4.1 and higher include support for Google's Maven repo using
        // the google() method. And you need to include this repo to download
        // Android Gradle plugin 3.0.0 or higher.
        google()
        ...
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0'
    }
}

至于为什么google() 这个方法必须放到第一位？我只能说“任性”。

官方文档链接如下：developers.google.com/android/gui…