android - VSCode中的新Flutter项目。无法解析Kotlin插件

Question

TL; DR

在VSCode中创建新的flutter项目时，如何正确使用Kotlin插件？

我正在尝试在VSCode中创建一个新的flutter项目。

从今年年初开始，Flutter一直在为我工作，但是由于某种原因，当我尝试在设备上运行时，在调试控制台中收到此错误。

Launching lib/main.dart on SM A520F in debug mode...
* Error running Gradle:
ProcessException: Process "/Users/jackstewart/Desktop/Work/All App Projects/Stiffness Method Solver/Flutter/newtest/android/gradlew" exited abnormally:

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.71.
     Required by:
         project :
      > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.71.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.2.71/kotlin-gradle-plugin-1.2.71.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.2.71/kotlin-gradle-plugin-1.2.71.pom'.
               > Connect to 10.1.1.150:19000 [/10.1.1.150] failed: Connection refused (Connection refused)
      > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.71.
         > Could not get resource 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-gradle-plugin/1.2.71/kotlin-gradle-plugin-1.2.71.pom'.
            > Could not GET 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-gradle-plugin/1.2.71/kotlin-gradle-plugin-1.2.71.pom'.
               > Connect to 10.1.1.150:19000 [/10.1.1.150] failed: Connection refused (Connection refused)

* 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 full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 2s
  Command: /Users/jackstewart/Desktop/Work/All App Projects/Stiffness Method Solver/Flutter/newtest/android/gradlew app:properties

Please review your Gradle project setup in the android/ folder.
Exited (sigterm)

我的android / gradle.build是

buildscript {
    ext.kotlin_version = '1.2.71'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

我其他的flutter项目都使用java作为其android代码。这是我第一次使用kotlin，因为它现在似乎是默认值。我不确定我是否具有正确的kotlin插件或如何安装它，我只是假设VSCode在设置新项目时会自动执行此操作。

重现步骤

1. Open new window in VSCode
2. View > command palate > Flutter: New Project
3. Type “newtest” and hit enter
4. Select a folder to create the project
5. Connect device
6. In vscode click debug > start debugging

我在vscode底部栏中的sdk抖动显示
Flutter: 1.9.1+hotfix.6
我的gradlew文件是

#!/usr/bin/env bash

##############################################################################
##
##  Gradle start up script for UN*X
##
##############################################################################

# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS=""

APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`

# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"

warn ( ) {
    echo "$*"
}

die ( ) {
    echo
    echo "$*"
    echo
    exit 1
}

# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
case "`uname`" in
  CYGWIN* )
    cygwin=true
    ;;
  Darwin* )
    darwin=true
    ;;
  MINGW* )
    msys=true
    ;;
esac

# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
    ls=`ls -ld "$PRG"`
    link=`expr "$ls" : '.*-> \(.*\)$'`
    if expr "$link" : '/.*' > /dev/null; then
        PRG="$link"
    else
        PRG=`dirname "$PRG"`"/$link"
    fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/" >/dev/null
APP_HOME="`pwd -P`"
cd "$SAVED" >/dev/null

CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar

# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
        # IBM's JDK on AIX uses strange locations for the executables
        JAVACMD="$JAVA_HOME/jre/sh/java"
    else
        JAVACMD="$JAVA_HOME/bin/java"
    fi
    if [ ! -x "$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
else
    JAVACMD="java"
    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi

# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
    MAX_FD_LIMIT=`ulimit -H -n`
    if [ $? -eq 0 ] ; then
        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
            MAX_FD="$MAX_FD_LIMIT"
        fi
        ulimit -n $MAX_FD
        if [ $? -ne 0 ] ; then
            warn "Could not set maximum file descriptor limit: $MAX_FD"
        fi
    else
        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
    fi
fi

# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi

# For Cygwin, switch paths to Windows format before running java
if $cygwin ; then
    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
    JAVACMD=`cygpath --unix "$JAVACMD"`

    # We build the pattern for arguments to be converted via cygpath
    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
    SEP=""
    for dir in $ROOTDIRSRAW ; do
        ROOTDIRS="$ROOTDIRS$SEP$dir"
        SEP="|"
    done
    OURCYGPATTERN="(^($ROOTDIRS))"
    # Add a user-defined pattern to the cygpath arguments
    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
    fi
    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    i=0
    for arg in "$@" ; do
        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option

        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
        else
            eval `echo args$i`="\"$arg\""
        fi
        i=$((i+1))
    done
    case $i in
        (0) set -- ;;
        (1) set -- "$args0" ;;
        (2) set -- "$args0" "$args1" ;;
        (3) set -- "$args0" "$args1" "$args2" ;;
        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
    esac
fi

# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
function splitJvmOpts() {
    JVM_OPTS=("$@")
}
eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"

exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"

我尝试过的内容

控制台错误提示尝试使用以下命令运行:--stacktrace，--info，--debug和--scan。我从 this post知道了怎么做

我的堆栈跟踪很长而且很相似。信息结果相似，调试结果太长(如果您真的希望我可以包括它们)，扫描结果又短又奇。似乎是在说我无法扫描，但建议您扫描…|:

看来我的主要问题是Kotlin在这一行

Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.71

但是当我用谷歌搜索时并没有太多

This SO post导致我进入 this kotlin documentation，据说该文件在gradle文件中使用了新版本，例如

classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.61" 

但是我在新版本中遇到相同的错误

Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.61

我的问题是，在VSCode中创建新的flutter项目时，如何正确使用Kotlin插件？

编辑:

最后，我放弃了kotlin，回到了Java。

很可惜，因为kotlin是flutter中的默认设置，这意味着它是首选的，而且我听说使用它比java有一些优势。这就是为什么我没有将其作为答案的原因。这是我转换回Java的步骤

删除android文件夹

导航到项目

的父目录
终端运行中的

flutter create --org com.example.newtest -a java newtest

或更一般地

flutter create --org [package] -a java [project]

在vscode中，单击调试>开始调试

编辑2 :

自上次编辑以来，我什至无法运行hello world项目。

编辑3 :

我重新安装了Android Studio两次(第一次重新安装可能会遇到问题，可能是因为我将旧的Android SDK拖到了Android Studio文件夹中，因为它不包含在内)。再次重新安装后，kotlin现在可以在新项目中轻松工作。
第二次卸载时，我使用以下命令来帮助 https://stackoverflow.com/a/18458893/9713633

Answer 1

Could not GET 'https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.2.71/kotlin-gradle-plugin-1.2.71.pom'. Connect to 10.1.1.150:19000 [/10.1.1.150] failed: Connection refused (Connection refused)

基于此错误，主机名似乎已解析为IP地址 10.1.1.150。该IP地址为 reserved for local use，无法通过Internet路由，因此该主机名的DNS解析似乎有问题。您应该调查为什么会发生这种情况(可能是本地主机文件，还是本地DNS服务器？)。如果您可以将其解析为正确的IP(我当前获得的IP是 172.217.169.46)，那么它应该可以解决您的问题(或者至少可以使您更进一步)。

编辑:基于错误中的端口号(如URL所示，它不是443)，也许它正在尝试连接到该IP上的代理而不是解析主机名？您是否设置了代理(可能不再工作了)？