第一次搭建Flutter项目,启动后报错连接超时,似乎是下载什么东西没ok....

详细报错信息:

event sent after app closed: {id: 0, progressId: null, message: Running "flutter pub get" in flutter_app...}event sent after app closed: {id: 0, progressId: null, finished: true}Launching lib/main.dart on Android SDK built for x86 in debug mode...Running Gradle task 'assembleDebug'...Exception in thread "main" java.net.ConnectException: Operation timed out (Connection timed out)    at java.net.PlainSocketImpl.socketConnect(Native Method)    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)    at java.net.Socket.connect(Socket.java:607)    at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:666)    at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)    at sun.net.NetworkClient.doConnect(NetworkClient.java:180)    at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)    at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)    at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)    at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1162)    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1056)    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1570)    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268)    at org.gradle.wrapper.Download.downloadInternal(Download.java:58)    at org.gradle.wrapper.Download.download(Download.java:44)    at org.gradle.wrapper.Install$1.call(Install.java:61)    at org.gradle.wrapper.Install$1.call(Install.java:48)    at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65)    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)Exception: Gradle task assembleDebug failed with exit code 1

解决方法(本地尝试可行):

　　项目结构

　　1.通过配置文件 gradle-wrapper.properties 查看项目所需的gradlew版本(上图所示为gradle-5.6.2-all.zip)。通过浏览器下载到本地解压,将压缩包放入到与配置文件gradle-wrapper.properties同级目录下。入上图所示,我下载的是:

gradle-5.6.2-bin.zip

　　2.修改gradlw.bat文件,在 APP_HOME下面添加一行代码,指定到gradlew目录(根据个人目录配置):/Library/profiles/gradle-5.6.2/.gradle

set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
set GRADLE_OPTS="-Dgradle.user.home=/Library/profiles/gradle-5.6.2/.gradle"

set GRADLE_OPTS="-Dgradle.user.home=/Library/profiles/gradle-5.6.2/.gradle"

　　3.修改 Flutter sdk中的gradle工具配置文件(根据自己的路径配置) :/Library/profiles/Flutter/sdk/flutter/packages/flutter_tools/gradle/flutter.gradle,添加国内的仓库镜像地址,指定到aliyun上:

buildscript {    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:3.5.0'    }}........................

　　4.重新启动运行,正常: