flutter的环境安装配置问题

（1）安装android SDK时，会出现Android license 的问题，将JAVA JDK降级到SE8就可以了，很多版本没对应上，JAVA8是比较稳定的，包括后面的gradle也需要基于JAVA8

问题描述：[!] Android toolchain - develop for Android devices (Android SDK 27.0.3) ✗ Android license status unknown.

解决：安装JAVA8后，运行 flutter doctor --android-licenses

（2）卡在Running ‘gradle assembleDebug运行阶段，引用国内阿里云的镜像解决。

问题描述：Running Gradle task 'assembleDebug'...

解决：

修改项目中`android/build.gradle`文件

buildscript {
    repositories {
        //修改的地方
        //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:3.2.1'
    }
}

allprojects {
    repositories {
        //修改的地方
        //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' }
    }
}

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

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

修改Flutter的配置文件, 该文件在`Flutter安装目录/packages/flutter_tools/gradle/flutter.gradle`

buildscript {
    repositories {
        //修改的地方
        //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:3.2.1'
    }
}

flutter的环境安装配置问题

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