Flutter开发之——运行卡在gradle assembleDebug

一 现象

当Flutter中使用了path_provider时，pubspec.yaml中配置了path_provider依赖，并执行Pub get时，程序执行gradle assembleDebug，出现如下错误

二 现象说明

2.1 Windows下Flutter配置

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

2.2 原因说明

• 即使将android下的build.gradle仓库中google、jcenter修改为阿里云仓库，仍然无法下载依赖如guava:26.0-jre、kotlin-reflect-1.3.11等
• path_provider依赖仍然需要外网访问权限

三 解决办法

3.1 代码仓库替换为阿里云仓库(可不做修改)

3.1.1 阿里云仓库地址：https://maven.aliyun.com/mvn/guide

3.1.2 在Intellij中的Android项目，使用Android studio工具打开(Intellij没有修改依赖后同步按钮)

依次点击：android—>Flutter—>Open Android module in Android Studio

3.1.3 Android项目修改

gradle使用默认配置(不修改)

android/build.gradle

dependencies {
       classpath 'com.android.tools.build:gradle:4.1.0'
}

android\gradle\wrapper\gradle-wrapper.properties

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

android/build.gradle(使用阿里云地址)

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        //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:4.1.0'
        //classpath 'com.android.tools.build:gradle:3.5.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}
allprojects {
    repositories {
        //google()
        //jcenter()
        //mavenCentral()
        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/'}
    }
}

3.1.4 Flutter SDK修改

Flutter SDK的安装位置

D:\SoftWare\flutter

修改的文件位置(Flutter SDK\packages\flutter_tools\gradle)

aar_init_script.gradle

project.repositories {
    maven {
       //url "$storageUrl/download.flutter.io"
	    url "https://storage.flutter-io.cn/download.flutter.io"
     }
}

flutter.gradle

repositories {
    //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' }
}
class FlutterPlugin implements Plugin<Project> {
    //private static final String DEFAULT_MAVEN_HOST = "https://storage.googleapis.com";
    private static final String DEFAULT_MAVEN_HOST = "https://storage.flutter-io.cn/download.flutter.io";
}    

resolve_dependencies.gradle

repositories {
    //google()
    //jcenter()
    //maven {url "$storageUrl/download.flutter.io"}
    
    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 "https://storage.flutter-io.cn/download.flutter.io"}
}

3.2 设置代理

首先开启代理(确定代理的端口号:8580)

设置代理1

依次点击：File—>Settings—>Appearance&Behavior—>System Settings—>HTTP Proxy

点击Check connection，输入外网网址如(https://youtube.com/)

代理设置2(gralde.properties)

systemProp.http.proxyHost=proxy.company.com
systemProp.http.proxyPort=443
systemProp.http.proxyUser=username
systemProp.http.proxyPassword=password
systemProp.http.auth.ntlm.domain=domain

systemProp.https.proxyHost=proxy.company.com
systemProp.https.proxyPort=443
systemProp.https.proxyUser=username
systemProp.https.proxyPassword=password
systemProp.https.auth.ntlm.domain=domain

此处，没有密码，顾设置如下

systemProp.http.proxyHost=127.0.0.1
systemProp.http.proxyPort=8580

systemProp.https.proxyHost=127.0.0.1
systemProp.https.proxyPort=8580

此处设置的代理同步保存在

C:\Users\Admin\.gradle\gradle.properties

不想使用代理，可在项目的gradle.properties和此处的gradle.properties删除代理设置

3.3 运行命令

打开Android Stdudio下面的Terminal

运行指令(显示Build Success说明编译成功)

gradlew clean
gradlew build