新建的flutter,运行项目就报错

Question

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Launching lib\main.dart on V2166BA in debug mode...
Running Gradle task 'assembleDebug'...

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all files for configuration ':classpath'.
   > Could not resolve com.android.tools.build:gradle:7.3.0.
     Required by:
         project :
      > Could not resolve com.android.tools.build:gradle:7.3.0.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/7.3.0/gradle-7.3.0.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/7.3.0/gradle-7.3.0.pom'.
               > Connect to 127.0.0.1:9910 [/127.0.0.1] failed: Connection refused: no further information
      > Could not resolve com.android.tools.build:gradle:7.3.0.
         > Could not get resource 'https://repo.maven.apache.org/maven2/com/android/tools/build/gradle/7.3.0/gradle-7.3.0.pom'.
            > Could not GET 'https://repo.maven.apache.org/maven2/com/android/tools/build/gradle/7.3.0/gradle-7.3.0.pom'.
               > Connect to 127.0.0.1:9910 [/127.0.0.1] failed: Connection refused: no further information
   > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10.
     Required by:
         project :
      > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.7.10/kotlin-gradle-plugin-1.7.10.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.7.10/kotlin-gradle-plugin-1.7.10.pom'.
               > Connect to 127.0.0.1:9910 [/127.0.0.1] failed: Connection refused: no further information
      > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10.
         > Could not get resource 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.7.10/kotlin-gradle-plugin-1.7.10.pom'.
            > Could not GET 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.7.10/kotlin-gradle-plugin-1.7.10.pom'.
               > Connect to 127.0.0.1:9910 [/127.0.0.1] failed: Connection refused: no further information

* 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 17s
Retrying Gradle Build: #1, wait time: 100ms
[!] Gradle threw an error while downloading artifacts from the network.
Running Gradle task 'assembleDebug'...

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all files for configuration ':classpath'.
   > Could not resolve com.android.tools.build:gradle:7.3.0.
     Required by:
         project :
      > Could not resolve com.android.tools.build:gradle:7.3.0.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/7.3.0/gradle-7.3.0.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/7.3.0/gradle-7.3.0.pom'.
               > Connect to 127.0.0.1:9910 [/127.0.0.1] failed: Connection refused: no further information
      > Could not resolve com.android.tools.build:gradle:7.3.0.
         > Could not get resource 'https://repo.maven.apache.org/maven2/com/android/tools/build/gradle/7.3.0/gradle-7.3.0.pom'.
            > Could not GET 'https://repo.maven.apache.org/maven2/com/android/tools/build/gradle/7.3.0/gradle-7.3.0.pom'.
               > Connect to 127.0.0.1:9910 [/127.0.0.1] failed: Connection refused: no further information
   > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10.
     Required by:
         project :
      > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.7.10/kotlin-gradle-plugin-1.7.10.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.7.10/kotlin-gradle-plugin-1.7.10.pom'.
               > Connect to 127.0.0.1:9910 [/127.0.0.1] failed: Connection refused: no further information
      > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10.
         > Could not get resource 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.7.10/kotlin-gradle-plugin-1.7.10.pom'.
            > Could not GET 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.7.10/kotlin-gradle-plugin-1.7.10.pom'.
               > Connect to 127.0.0.1:9910 [/127.0.0.1] failed: Connection refused: no further information

* 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 8s
[!] Gradle threw an error while downloading artifacts from the network.
Exception: Gradle task assembleDebug failed with exit code 1

Answer 1

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  我们在开发flutter中 肯定需要升级，因为flutter的版本更新也很快，下面提供两种升级方式：

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如果你已经解决了该问题, 非常希望你能够分享一下解决方案, 写成博客, 将相关链接放在评论区, 以帮助更多的人 ^-^