问题

在搭建flutter android环境时，有时会报错如下：

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Launching lib/main.dart on AOSP on IA Emulator in debug mode...
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8
Exception in thread "main" java.lang.RuntimeException: Timeout of 120000 reached waiting for exclusive access to file: /Users/ksnowlv/.gradle/wrapper/dists/gradle-7.6.3-all/aocdy2d2z8kodnny3rsumj8i8/gradle-7.6.3-all.zip
	at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:61)
	at org.gradle.wrapper.Install.createDist(Install.java:48)
	at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:128)
	at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
[!] Gradle threw an error while downloading artifacts from the network.
Retrying Gradle Build: #1, wait time: 100ms
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8

解决方案

1.国内的镜像源加速gradle构建

build.gradle 和 settings.gradle添加国内的镜像源加速gradle构建。

build.gradle如下

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allprojects {

    repositories {
        //国内镜像源
        maven { url 'https://maven.aliyun.com/repository/google' }
        maven { url 'https://maven.aliyun.com/repository/jcenter' }
        google()
        mavenCentral()
        maven { url "https://jitpack.io" }
    }
}

2.清理Gradle缓存文件

执行以下命令清理Gradle缓存，然后重新构建项目

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cd android
./gradlew clean

3.下载gradle文件

在gradle 找到可用的gradle文件，笔者环境使用gradle-7.4.2-all。链接为https://services.gradle.org/distributions/gradle-7.4.2-all.zip

更新gradle-wrapper.properties中的distributionUrl

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distributionUrl=https://services.gradle.org/distributions/gradle-7.4.2-all.zip

重新同步。

若同步不下来，则从上述链接下载zip包。

image

把zip压缩包放到1所示目录，然后，解压同步即可。

4.VSCode下效果

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ksnowlv@MacBook-Pro-3 android % cd android     
./gradlew clean
cd: no such file or directory: android
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8
Downloading https://services.gradle.org/distributions/gradle-7.5.1-all.zip
........................................................................................................................................................................................................................^C%                                                                                   
ksnowlv@MacBook-Pro-3 android % cd android
./gradlew clean
cd: no such file or directory: android
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8
Unzipping /Users/ksnowlv/.gradle/wrapper/dists/gradle-7.5.1-all/1ehga6e77gqps5uk2kc5kf1vc/gradle-7.5.1-all.zip to /Users/ksnowlv/.gradle/wrapper/dists/gradle-7.5.1-all/1ehga6e77gqps5uk2kc5kf1vc
Set executable permissions for: /Users/ksnowlv/.gradle/wrapper/dists/gradle-7.5.1-all/1ehga6e77gqps5uk2kc5kf1vc/gradle-7.5.1/bin/gradle

Welcome to Gradle 7.5.1!

Here are the highlights of this release:
 - Support for Java 18
 - Support for building with Groovy 4
 - Much more responsive continuous builds
 - Improved diagnostics for dependency resolution

For more details see https://docs.gradle.org/7.5.1/release-notes.html

Starting a Gradle Daemon (subsequent builds will be faster)

> Task :gradle:compileGroovy
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8

BUILD SUCCESSFUL in 1m 40s
6 actionable tasks: 5 executed, 1 up-to-date
ksnowlv@MacBook-Pro-3 android %