## 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：

```json
// 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：

```json
// 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`）

```json
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
}
}
}
```