Running Gradle task ‘assembleDebug‘

原本项目可以正常跑起来，在安卓真机上正常运行的，后来不知道怎么滴，突然就跑不起来了，但是在iOS设备上可以正常运行，后续判断主要是版本不匹配导致的，以及无法访问google服务。

话不多说，先来看看问题的呈现

具体问题呈现如下：

Running Gradle task 'assembleDebug'...
Exception in thread "main" java.net.SocketException: Connection reset
    at java.base/java.net.SocketInputStream.read(SocketInputStream.java:186)
    at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140)
    at java.base/sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:478)
    at java.base/sun.security.ssl.SSLSocketInputRecord.readHeader(SSLSocketInputRecord.java:472)
    at java.base/sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:160)
    at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:111)
    at java.base/sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1426)
    at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1336)
    at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:450)
    at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:421)
    at java.base/sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:572)
    at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:197)
    at java.base/sun.net.www.protocol.http.HttpURLConnection.followRedirect0(HttpURLConnection.java:2787)
    at java.base/sun.net.www.protocol.http.HttpURLConnection.followRedirect(HttpURLConnection.java:2699)
    at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1854)
    at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1520)
    at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:250)
    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)
Retrying Gradle Build: #2, wait time: 200ms
[!] Gradle threw an error while downloading artifacts from the network.

主要解决方案如下：

若是因网络原因无法访问google服务，可以使用国内镜像代替，主要修改之处为：

android文件夹下build.gradle文件修改

将下面两行代码进行注释

google()
mavenCentral()

新增阿里云镜像如下

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

修改gradle版本，android/gradle/wrapper/gradle-wrapper.properties，具体版本可查看

https://services.gradle.org/distributions/

distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-all.zip

项目运行成功的话，~/.gradle/wrapper/dist/gradle-7.2-all/路径下应是如此

若该路径下一直是下方这样的话，则表示gradle相应的版本未下载成功

此时，你可以自己去https://services.gradle.org/distributions/这里找到你要下载的版本手动下载下来，直接用.zip替换上面的两个就好了

此处另外需要关注两件事情，其一是java版本与gradle版本匹配

其二是gradle版本与gradle插件版本匹配兼容

android/build.gradle中classpath 'com.android.tools.build:gradle:4.1.0' 指的就是gradle插件版本，andriod/gradle/wrapper/gradle-wrapper.properties中就是gradle插件所需的gradle版本

flutter sdk路径下，如/Users/fl-10026268/fvm/versions/3.0.5/packages/flutter_tools/gradle/flutter.gradle文件修改

buildscript {
    repositories {
        // 注释
        // google()
        // mavenCentral()
        //  新增镜像
        maven { url 'https://maven.aliyun.com/repository/google' }
        maven { url 'https://maven.aliyun.com/repository/jcenter' }
        maven { url 'https://maven.aliyun.com/nexus/content/groups/public' }
    }
    dependencies {
        /* When bumping, also update ndkVersion above. */
        classpath 'com.android.tools.build:gradle:4.1.0'
    }
}

/// https://storage.flutter-io.cn 替换 https://storage.googleapis.com
private static final String DEFAULT_MAVEN_HOST = "https://storage.flutter-io.cn";  ///  "https://storage.googleapis.com";

flutter sdk路径下，如/Users/fl-10026268/fvm/versions/3.0.5/packages/flutter_tools/gradle/resolve_dependencies.gradle文件修改

// http://download.flutter.io 替换 $storageUrl/download.flutter.io
repositories {
    google()
    mavenCentral()
    maven {
        url "http://download.flutter.io"
        // url "$storageUrl/download.flutter.io"
    }
}

flutter sdk路径下，如/Users/fl-10026268/fvm/versions/3.0.5/packages/flutter_tools/lib/src/http_host_validator.dart修改

/// Common Flutter HTTP hosts.
const String kPubDevHttpHost = 'https://pub.flutter-io.cn/';  /// https://pub.dev/
const String kgCloudHttpHost = 'https://storage.flutter-io.cn/';  /// https://cloud.google.com/

/// MacOS specific required HTTP hosts.
const List<String> macOSRequiredHttpHosts = <String>[
  'https://cocoapods.org/',
];

/// Android specific required HTTP hosts.
List<String> androidRequiredHttpHosts(Platform platform) {
  return <String>[
    // If kEnvCloudUrl is set, it will be used as the maven host
    if (!platform.environment.containsKey(kEnvCloudUrl))
      'https://dl.google.com/dl/android/maven2/',
      // 'https://maven.aliyun.com/repository/google/',
  ];
}

通过以上几个步骤的修改，基本上就可以解决此问题了，因本人不是安卓开发，我在这个问题上耽误了好些天，终于解决让项目跑起来了，特在此总结一下经验，希望后来人不会因此耽误太多时间。

Running Gradle task ‘assembleDebug‘

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