Android 颤振应用程序可以'；不能在真实设备或模拟器上运行

我是个新手。我在运行颤振项目时遇到了麻烦

问题：

不适用于设备选择中显示的“main.dart”配置

运行项目后，控制台中显示以下异常

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Could not resolve all task dependencies for configuration ':app:debugCompileClasspath'.
   > Could not resolve io.flutter:flutter_embedding_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
     Required by:
         project :app
      > Could not resolve io.flutter:flutter_embedding_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/flutter_embedding_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/flutter_embedding_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
      > Could not resolve io.flutter:flutter_embedding_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/flutter_embedding_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/flutter_embedding_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
      > Could not resolve io.flutter:flutter_embedding_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/flutter_embedding_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/flutter_embedding_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
   > Could not resolve io.flutter:armeabi_v7a_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
     Required by:
         project :app
      > Could not resolve io.flutter:armeabi_v7a_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/armeabi_v7a_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/armeabi_v7a_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/armeabi_v7a_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/armeabi_v7a_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
      > Could not resolve io.flutter:armeabi_v7a_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/armeabi_v7a_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/armeabi_v7a_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/armeabi_v7a_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/armeabi_v7a_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
      > Could not resolve io.flutter:armeabi_v7a_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/armeabi_v7a_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/armeabi_v7a_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/armeabi_v7a_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/armeabi_v7a_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
   > Could not resolve io.flutter:x86_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
     Required by:
         project :app
      > Could not resolve io.flutter:x86_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/x86_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/x86_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
      > Could not resolve io.flutter:x86_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/x86_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/x86_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
      > Could not resolve io.flutter:x86_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/x86_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/x86_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
   > Could not resolve io.flutter:x86_64_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
     Required by:
         project :app
      > Could not resolve io.flutter:x86_64_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/x86_64_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_64_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/x86_64_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_64_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
      > Could not resolve io.flutter:x86_64_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/x86_64_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_64_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/x86_64_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_64_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect
      > Could not resolve io.flutter:x86_64_debug:1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.
         > Could not get resource 'http://download.flutter.io/io/flutter/x86_64_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_64_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
            > Could not GET 'http://download.flutter.io/io/flutter/x86_64_debug/1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119/x86_64_debug-1.0.0-a67792536ca236a971d0efbcfd7af4efb8f6c119.pom'.
               > Connect to download.flutter.io:80 [download.flutter.io/172.217.167.144] failed: Connection timed out: connect

* 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 6m 45s
Finished with error: Gradle task assembleDebug failed with exit code 1

用于颤振和飞镖的插件已安装最新版本。通过运行cmd中的颤振医生显示所有ok。在这里

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.12.13+hotfix.7, on Microsoft Windows
    [Version 10.0.18362.592], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version
    29.0.1)
[√] Android Studio (version 3.5)
[√] Connected device (1 available)

我不明白我错在哪里了。如果你知道，请帮助我

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感谢您的帮助

尝试重新安装Flitter的SDK。 我也面临同样的问题。然后我重新安装了颤振SDK，一切都很完美。

按照以下步骤操作：

转到项目结构>项目>NOSDK

将NOSDK更改为最新的ANDROID API平台

然后转到模块，执行相同的操作

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显示main.dart文件代码通过创建颤振应用程序提供的默认代码。它适合我。