【Flutter】Flutter环境搭建_flutter network resources

一、设备环境

Windows11
Java11

二、下载Flutter3

下载地址：

https://docs.flutter.dev/get-started/install/windows

我下载的Flutter版本：

三、修改Path环境变量

将下载的Flutter路径添加到系统环境变量Path中：

path-to-flutter/flutter/bin
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四、检查Flutter doctor

• 错误一：

Windows Version (Unable to confirm if installed Windows version is 10 or greater)
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• 错误一解决办法：

# 切换flutter渠道
[1] 打开cmd
[2] 输入flutter channel 查看自己的flutter channel版本
[3] 输入flutter channel master，将flutter版本切换为master
[4] 输入flutter upgrade 确保flutter更新到了最新版本
[5] 输入 flutter doctor 再次检查是否解决
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• 错误二：

Visual Studio not installed; this is necessary for Windows development
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• 错误二解决办法：

下载Visual Studio，地址为：
https://visualstudio.microsoft.com/zh-hans/downloads/
下载完了之后进行安装，我选择了c++模块、和windows 10 SDK。
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• 错误三：

Android toolchain - develop for Android devices
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• 错误三解决办法：

[1] 下载Android Studio，地址为：
https://developer.android.com/studio/index.html
[2] 通过 Android Studio 设置中的 SDK Tools 来安装 Command-line Tools(lastest)
[3] flutter config --android-sdk E:\environment\Android\Sdk
[4] flutter doctor --android-licenses
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• 错误四：

[!] Network resources
HTTP Host Availability
 X A network error occurred while checking "https://pub.dev/": 信号灯超时时间已到
 X An HTTP error occurred while checking "https://github.com/": 信号灯超时时间已到
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• 错误四解决办法：

错误提示如下，分析可知是 maven.google.com 访问失败造成的：
HTTP host https://maven.google.com/ is not reachable. Reason: An error occurred while checking the HTTP host: Operation timed out 

[1] 打开path-to-flutter-sdk/packages/flutter_tools/lib/src/http_host_validator.dart文件，修改https://maven.google.com/为 google maven 的国内镜像，如https://dl.google.com/dl/android/maven2/
[2] 设置系统环境变量
FLUTTER_STORAGE_BASE_URL  -> https://storage.flutter-io.cn
PUB_HOSTED_URL -> https://pub.flutter-io.cn
[3] 去到flutter\bin\cache目录，删除flutter_tools.snapshot文件。请不要删除cache文件夹，不然需要下载很多东西。
[4] 重新执行flutter doctor
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五、环境完成

六、自己修改的配置（仅供参考）

• 修改flutter.gradle

flutter\packages\flutter_tools\gradle\flutter.gradle
原来：
private static final String DEFAULT_MAVEN_HOST = "https://storage.googleapis.com";
修改：
// private static final String DEFAULT_MAVEN_HOST = "https://storage.googleapis.com";
private static final String DEFAULT_MAVEN_HOST = "https://storage.flutter-io.cn";
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• 在项目中，修改android/build.gradle

buildscript {
    ext.kotlin_version = '1.7.10'
    repositories {
//        google()
//        mavenCentral()
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/google'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/groups/public/'
        }
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.3.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
//        google()
//        mavenCentral()
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/google'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/groups/public/'
        }
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

tasks.register("clean", Delete) {
    delete rootProject.buildDir
}
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