Android开发无法连接dl.google.com问题

Android Studio安装完成，新创建工程提示以下信息：

FAILURE: Build failed with an exception.
* What went wrong:
A problem occurred configuring root project 'MyApplication'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve com.android.tools.build:gradle:xxx.
     Required by:
         project :
      > Could not resolve com.android.tools.build:gradle:xxx.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/xxx/gradle-xxx.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/xxx/gradle-xxx.pom'.
               > Connect to dl.google.com:443 [dl.google.com/172.217.26.14, dl.google.com/2404:6800:4004:809:0:0:0:200e] failed: No route to host (connect failed)

意思是无法访问dl.google.com这个域名，用命令ping这个域名的确是无法访问，Android 工程的构建过程很多步骤需要访问这个域名

解决方法：

1.修改项目根目录下的build.gradle文件，使用国内地址构建，如下：

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

    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.2'
    }
}

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

问题是解决了，但是麻烦也不利于代码同步
2.查询dl.google.com在国内的可用IP

image.png

修改电脑hosts文件，镜像国内域名访问，配置如下：
Mac下：Finder->前往->前往文件夹（输入etc/hosts）：文件拷贝出来，打开后末尾添加：
203.208.43.71 dl.google.com修改完成后替换hosts文件即可。
Windows访问系统hosts文件，修改方式相同。