Flutter开发环境搭建 for mac

step1:brew
https://segmentfault.com/a/1190000013317511
(brew 是 Mac 下的一个包管理工具，类似于 centos 下的 yum，可以很方便地进行安装/卸载/更新各种软件包，例如：nodejs, elasticsearch, kibana, mysql, mongodb 等等，可以用来快速搭建各种本地环境，程序员必备工具)
step2:Flutter SDK包
https://flutter.io/setup-macos/
（记住解压的地址）
step3:环境变量配置
终端键入

vim ~/.bash_profile

键入（意思是配置flutter命令在任何地方都可以使用，）
pwd是Flutter下载解压的地址

export PATH=/pwd/flutter/bin:$PATH

source命令重新加载一下

source ~/.bash_profile

step4:开发环境配置
检查

flutter doctor

如果有[!]x标志，表示本行检测没有通过，就需要我们设置或者安装相应的软件

Android studio安装
http://www.android-studio.org/
终端允许协议：flutter doctor --android-licenses 一通Y下去
其他按照对应的安装插件

step5:Android studio

Configure----->plugin-----> download Flutter
Tools------->AVD manager(虚拟机)------>Create Virtual Device----->Nexus 5x(自选)
虚拟机运行以后，点击debug按钮，让Flutter程序跑起来
Debug
错误1:

 FAILURE: Build failed with an exception.
What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not download kotlin-compiler-embeddable.jar (org.jetbrains.kotlin:kotlin-compiler-embeddable:1.3.50)
      > Could not get resource 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-compiler-embeddable/1.3.50/kotlin-compiler-embeddable-1.3.50.jar'.
         > Read timed out

解决：
一、修改掉项目下的android目录下的build.gradle文件，把google() 和 jcenter()这两行去掉。改为阿里的链接

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' }

二、修改Flutter SDK包下的flutter.gradle文件,这个目录要根据你的SDK存放的位置有所变化。

这一步有两种情况

1、flutter.gradle文件中repositories中是google() 和 jcenter()，

repositories{
google()
gcenter()
}

把google() 和 jcenter()这两行去掉。改为阿里的链接。

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' }

2，flutter.gradle文件中repositories中是下图这样的

repositories {
 jcenter()
 maven {
 url 'https://dl.google.com/dl/android/maven2'
 }

把repositories 中改成

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

以上两步骤之后再debug，若又出现相同报错，则在终端

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vim ~/.bash_profile

加上两句

PUB_HOSTED_URL=https://pub.flutter-io.cn
FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn

不再报错

错误2:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugKotlin'.
> Could not resolve all artifacts for configuration ':app:debugCompileClasspath'.
   > Failed to transform artifact 'arm64_v8a_debug.jar (io.flutter:arm64_v8a_debug:1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695)' to match attributes {artifactType=android-classes, org.gradle.libraryelements=jar, org.gradle.usage=java-runtime}.
      > Execution failed for JetifyTransform: C:\Users\juwuguo\.gradle\caches\modules-2\files-2.1\io.flutter\arm64_v8a_debug\1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695\2ef393f0cfe7b16f75cbb560a12364cc448a62af\arm64_v8a_debug-1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695.jar.
         > Failed to transform 'C:\Users\juwuguo\.gradle\caches\modules-2\files-2.1\io.flutter\arm64_v8a_debug\1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695\2ef393f0cfe7b16f75cbb560a12364cc448a62af\arm64_v8a_debug-1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695.jar' using Jetifier. Reason: invalid block type. (Run with --stacktrace for more details.)
   > Failed to transform artifact 'x86_64_debug.jar (io.flutter:x86_64_debug:1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695)' to match attributes {artifactType=android-classes, org.gradle.libraryelements=jar, org.gradle.usage=java-runtime}.
      > Execution failed for JetifyTransform: C:\Users\juwuguo\.gradle\caches\modules-2\files-2.1\io.flutter\x86_64_debug\1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695\ce0e3fab2c8696e176c54639579d3d438a8a0925\x86_64_debug-1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695.jar.
         > Failed to transform 'C:\Users\juwuguo\.gradle\caches\modules-2\files-2.1\io.flutter\x86_64_debug\1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695\ce0e3fab2c8696e176c54639579d3d438a8a0925\x86_64_debug-1.0.0-2994f7e1e682039464cb25e31a78b86a3c59b695.jar' using Jetifier. Reason: invalid literal/length code. (Run with --stacktrace for more details.)

解决：
AndroidStudio Preference ----->Compiler----->kotlin Compiler-----> Target JVM version 把1.6改为1.8

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