可参照官网：https://flutterchina.club/get-started/install/
Linux环境

第一步：安装flutter

sudo snap install flutter --classic 

第二步：flutter环境校验

flutter doctor
flutter doctor -v
flutter doctor --android-licenses (如果提示Android licenses not accepted.  To resolve this, run: flutter doctor     --android-licenses)<一直Y>

第三步：插件安装

安装开发工具（以AS为例），安装完开发工具后，请在【file】–【settings】–【Plugins】中搜索Flutter、Dart两个插件进行安装

第四步：运行DEMO

新建demo，并运行demo（此时可能会出现一直在Running Gradle task ‘assembleDebug’）

备注：
如果出现一直Running Gradle task 'assembleDebug’的情况，请修改两个文件

1> 修改项目中的Android目录下的build.gradle文件内容，注释google()、 jcenter()如下：

buildscript {
    ext.kotlin_version = '1.3.72'
    repositories {
        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:3.6.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        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' }
    }
}

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

task clean(type: Delete) {
    delete rootProject.buildDir
}

2> 修改安装flutter环境目录中…/packages/flutter_tools/gradle/flutter.gradle文件中注释google()、 jcenter()，更改成如下：

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' }

注意：/packages/flutter_tools/gradle/flutter.gradle文件中的dependencies中的gradle版本应该与Android项目中的build.gradle文件中版本一致