运行flutter项目时遇到的问题修改flutter为国内镜像

运行flutter项目时遇到的问题a problem occurred evaluating project ‘:app’. Could not resolve all artifacts for configuration ‘classpath’. Could not find com.android.tools.build:gradle:3.5.0.

a problem occurred evaluating project ‘:app’. Could not resolve all artifacts for configuration ‘classpath’. Could not find com.android.tools.build:gradle:3.5.0.

1. 首先要修改配置，因为有墙所以好多谷歌原生的东西用不了需要修改，先打开你安装好的flutter SDK，然后找到如下的目录，用记事本打开flutter.gradle
   

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’}
将上面的三句话添加到打开后的flutter.gradle如下地方，取代谷歌原来的

2. 修改flutter项目android目录下的build.gradle文件,将 google() ；jcenter()；注释，并添加下面的代码。

buildscript {
    
    repositories {
    
        // google()
        // jcenter()
        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'}
        }
        dependencies {
    
        classpath 'com.android.tools.build:gradle:3.1.2'
    }
}
allprojects {
    
    repositories {
    
        // google()
        // jcenter()
        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' }
    }
}

3. 如果上述全部完成后可以运行那么也就成功了，如果出现下面这种情况就需要再添加一些东西
   
   依旧是打开第一步的那个目录，选择我圈住的三个文件用记事本打开
   

ctrl+F内容搜索，找到https://storage.googleapis.com或是类似的语句，用http://download.flutter.io替换，然后就万事大吉啦。