flutter项目内配置代理

flutter项目内配置代理：

（1）项目名\android\build.gradle

代码：

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

（2）SDK名\flutter\packages\flutter_tools\gradle

buildscript {
    repositories {
        //google()
        //jcenter()
		maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'}
        maven{ url 'https://maven.aliyun.com/repository/google' }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
    }
}