android studio的gadle下载依赖慢问题

修改build.gradle的repositories
原内容：

repositories {
      google()
      mavenCentral()
  }

修改为：

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'
        }
  }
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'
            }
        }
    }