启动 flutter项目时报Could not find com.android.tools.build:gradle:3.2.1.

Error running Gradle:ProcessException: Process "D:\Android\APP path\flutter_app2\flutter_app2\android\gradlew.bat" exited abnormally:> Configure project :appProject evaluation failed including an error in afterEvaluate {}. Run with --stacktrace for details of the afterEvaluate {} error.FAILURE: Build failed with an exception.* Where:Build file 'D:\Android\APP path\flutter_app2\flutter_app2\android\app\build.gradle' line: 25* What went wrong:A problem occurred evaluating project ':app'.> Could not resolve all artifacts for configuration 'classpath'.   > Could not find com.android.tools.build:gradle:3.2.1.     Searched in the following locations:       - https://maven.aliyun.com/repository/jcenter/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom       - https://maven.aliyun.com/repository/jcenter/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.jar       - http://maven.aliyun.com/nexus/content/groups/public/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom       - http://maven.aliyun.com/nexus/content/groups/public/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.jar     Required by:         unspecified:unspecified:unspecified* Try:Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get fullinsights.* Get more help at https://help.gradle.orgBUILD FAILED in 3sPicked up _JAVA_OPTIONS: -Djava.NET.preferIPv4Stack=true  Command: D:\Android\APP path\flutter_app2\flutter_app2\android\gradlew.bat app:propertiesPlease review your Gradle project setup in the android/ folder.

大致意思是说：运行Gradle时出错，导致构建flutter构建失败

原因是因为获取不到 com.android.tools.build:gradle:3.2.1

原因一：

获取不到的原因一般是因为在中国没办法访问谷歌资源（有外网，等的除外），此时的解决办法是改用阿里的镜像。

分两步：

第一步：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。
并在下面添加阿里的链接 （注意：有两处修改）

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' }

如下：

buildscript {    repositories {//        google()//        jcenter()// 添加        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 {//        google()//        jcenter()//        maven {//            url 'https://google.bintray.com/exoplayer/'//        }// 添加        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}

第二步：修改 Flutter SDK 包下的 flutter.gradle 文件
路径根据你的sdk存放位置，例如我的是D:\SDK\Flutter\packages\flutter_tools\gradle\flutter.gradle
同样将 google()和 jcenter() 修改为阿里的链接

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

如下：

buildscript {    repositories {        //google()        //jcenter()        // 添加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'    }}

至此，在国内没办法访问谷歌资源的问题就解决了

然而，我的问题并没解决

仔细看报错信息后，发现找不到以下资源地址

    -  https://maven.aliyun.com/repository/jcenter/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom    -  https://maven.aliyun.com/repository/jcenter/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.jar    -  http://maven.aliyun.com/nexus/content/groups/public/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom    -  http://maven.aliyun.com/nexus/content/groups/public/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.jar

看到这里说明阿里链接是配置上了的，之所以找不到是因为gradle-3.2.1这个3.2.1版本太高了，应该是最新的

阿里连接中的gradle最高版本好像才3.1.2，所以获取不到

所以，解决办法是将项目下的android目录下的build.gradle文件和flutter SDK包下的flutter.gradle文件中的gradle版本改为阿里镜像中存在的版本

dependencies {        classpath 'com.android.tools.build:gradle:3.1.2'    }

来自于 https://blog.csdn.net/qq_33684444/article/details/86656301

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