Android Flutter Gradle allowInsecureProtocol

错误

A problem occurred configuring root project 'example'.
> Could not resolve all dependencies for configuration ':classpath'.
   > Using insecure protocols with repositories, without explicit opt-in, is     unsupported. Switch Maven repository 
'maven3(https://maven.aliyun.com/nexus/content/groups/public)' to redirect to a secure protocol (like HTTPS) or allow insecure protocols.
 See https://docs.gradle.org/7.0.2/dsl/org.gradle.api.artifacts.repositories.UrlArtifactRepository.html#org.gradle.api.artifacts.repositories.UrlArtifactRepository:allowInsecureProtocol for more details. 

原因

一问就是安全策略更新。

解决

在 gradle 安装路径下编辑
比如我的是 D:\Program Files\flutter\packages\flutter_tools\gradle\flutter.gradle
首先找到 buildScript

buildscript {
    repositories {
        maven { url 'https://maven.aliyun.com/repository/google' }
        maven { url 'https://maven.aliyun.com/repository/jcenter' }
        maven { url 'https://maven.aliyun.com/nexus/content/groups/public' }
        maven { url 'https://download.flutter.io'}
    }
    dependencies {
        /* When bumping, also update ndkVersion above. */
        classpath 'com.android.tools.build:gradle:4.1.0'
    }
}

其次找到 rootProject.allprojects

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