说明

Gradle源在国外，国内构建项目的时候经常报错连接超时，修改国内镜像可以解决。

方法

配置方式有仅对单个项目生效和对所有项目生效两种方式

对单个项目生效

1.打开Android Studio工程文件，找到build.gradle

2.使用文本编辑器打开，默认格式如下：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.1'

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

allprojects {
    repositories {
        google()
        jcenter()

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

３.修改为以下内容：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        maven {
            url 'https://maven.aliyun.com/repository/google'
        }
        maven {
            url 'https://maven.aliyun.com/repository/public'
        }
        maven {
            url 'https://maven.aliyun.com/repository/jcenter'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.1'

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

allprojects {
    repositories {
        maven {
            url 'https://maven.aliyun.com/repository/google'
        }
        maven {
            url 'https://maven.aliyun.com/repository/public'
        }
        maven {
            url 'https://maven.aliyun.com/repository/jcenter'
        }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

对所有项目生效

1.打开系统用户的Gradle配置目录：C:\Users\xxx\.gradle

2.新建文件init.gradle（注意文件后缀名为gradle）

allprojects{
    repositories {
        def ALIYUN_REPOSITORY_URL = 'https://maven.aliyun.com/repository/public'
        def ALIYUN_JCENTER_URL = 'https://maven.aliyun.com/repository/jcenter'
        all { ArtifactRepository repo ->
            if (repo instanceof MavenArtifactRepository){
                def url = repo.url.toString()
                if (url.startsWith('https://repo1.maven.org/maven2')) {
                    project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_REPOSITORY_URL."
                    remove repo
                }
                if (url.startsWith('https://jcenter.bintray.com/')) {
                    project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_JCENTER_URL."
                    remove repo
                }
            }
        }
        maven {
            url ALIYUN_REPOSITORY_URL
            url ALIYUN_JCENTER_URL
        }
    }
}