我的Flutter倒霉之旅（五）

前言

前面我们的flutter 最新稳定版本 flutter 1.17.1 已经成功在我们的设备上安家，但万事总有个万一，程序也是有些小脾气的，然后 就给你来了个bug调皮调皮，本文记录了 flutter 1.17.1启动的坑之 谷歌下载源被墙导致的启动报错
(ps:如果你是第一次查看本篇文章，建议查看 我的flutter倒霉之旅专题)

1. 启动报错之看看我见到的它

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Could not resolve all task dependencies for configuration ':app:debugCompileClasspath'.
   > Could not resolve io.flutter:flutter_embedding_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
     Required by:
         project :app
      > Could not resolve io.flutter:flutter_embedding_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
         > Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/flutter_embedding_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
            > Could not HEAD 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/flutter_embedding_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
               > Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect
      > Could not resolve io.flutter:flutter_embedding_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
         > Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/flutter_embedding_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
            > Could not HEAD 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/flutter_embedding_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
               > Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Read timed out
   > Could not resolve io.flutter:arm64_v8a_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
     Required by:
         project :app
      > Could not resolve io.flutter:arm64_v8a_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
         > Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/arm64_v8a_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
            > Could not HEAD 'https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/arm64_v8a_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
               > Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect
      > Could not resolve io.flutter:arm64_v8a_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
         > Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/arm64_v8a_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
            > Could not HEAD 'https://storage.googleapis.com/download.flutter.io/io/flutter/arm64_v8a_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/arm64_v8a_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
               > Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Read timed out
   > Could not resolve io.flutter:x86_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
     Required by:
         project :app
      > Could not resolve io.flutter:x86_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
         > Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/x86_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
            > Could not HEAD 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/x86_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
               > Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect
      > Could not resolve io.flutter:x86_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
         > Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/x86_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
            > Could not HEAD 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/x86_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
               > Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Read timed out
   > Could not resolve io.flutter:x86_64_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
     Required by:
         project :app
      > Could not resolve io.flutter:x86_64_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
         > Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_64_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/x86_64_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
            > Could not HEAD 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_64_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/x86_64_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
               > Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect
      > Could not resolve io.flutter:x86_64_debug:1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.
         > Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_64_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/x86_64_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
            > Could not HEAD 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_64_debug/1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664/x86_64_debug-1.0.0-fd60ddf7517ce2bfd6577636bda2065c0e492664.pom'.
               > Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Read timed out

该问题的解决办法为 更改flutter项目中android文件下的gradle配置以及flutter SDK中的 gradle 配置

2. 更改配置

在项目中 android 文件夹下的 build.gradle中注释原来的源，更改为以下源

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' }
maven { url 'http://download.flutter.io' }

更改示例

打开你的flutter SDK 目录，依次打开 packages=>flutter_tools=>gradle文件夹，找到flutter.gradle文件，我这里使用vscode将其打开进行更改，将官方原来的配置项注释，方便改回，然后改为以下代码：

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' } 
// class flutter plugin中的更改
private static final String MAVEN_REPO      = "https://storage.flutter-io.cn/download.flutter.io";

更改示例

3. 运行项目

在项目根目录 运行 flutter run 或者使用 android studio的 run main.dart都可以，然后控制台无报错，项目成功运行在了 android studio 创建的模拟器上

成功运行官方demo示例

(本文适合初学者，如果你是大佬级别的人物，我也欢迎指教！)