flutter環境搭建完成之後，首次運行項目，運行時會卡在Running Gradle task 'assembleDebug'..., 之後就會報這樣的錯！！
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:1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.
Required by:
project :app
> Could not resolve io.flutter:flutter_embedding_debug:1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.
> Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/flutter_embedding_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Could not GET 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/flutter_embedding_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Connect to storage.googleapis.com:443 [storage.googleapis.com/172.217.27.144] failed: Connection timed out: connect
> Could not resolve io.flutter:flutter_embedding_debug:1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.
> Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/flutter_embedding_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Could not GET 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/flutter_embedding_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect
> Could not resolve io.flutter:flutter_embedding_debug:1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.
> Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/flutter_embedding_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Could not GET 'https://storage.googleapis.com/download.flutter.io/io/flutter/flutter_embedding_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/flutter_embedding_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect
> Could not resolve io.flutter:x86_debug:1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.
Required by:
project :app
> Could not resolve io.flutter:x86_debug:1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.
> Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/x86_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Could not GET 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/x86_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Connect to storage.googleapis.com:443 [storage.googleapis.com/172.217.27.144] failed: Connection timed out: connect
> Could not resolve io.flutter:x86_debug:1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.
> Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/x86_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Could not GET 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/x86_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] failed: Connection timed out: connect
> Could not resolve io.flutter:x86_debug:1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.
> Could not get resource 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/x86_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Could not GET 'https://storage.googleapis.com/download.flutter.io/io/flutter/x86_debug/1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32/x86_debug-1.0.0-6bc433c6b6b5b98dcf4cc11aff31cdee90849f32.pom'.
> Connect to storage.googleapis.com:443 [storage.googleapis.com/34.64.4.80] 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 7m 50s
Running Gradle task 'assembleDebug'...
Running Gradle task 'assembleDebug'... Done 472.2s (!)
Exception: Gradle task assembleDebug failed with exit code 1
解決方案
查閱發現是 因爲Gradle的Maven倉庫在國外, 可以使用阿里雲的鏡像地址。
1.修改項目中android/build.gradle文件
2. 修改flutter sdk安裝目錄下的 packages/flutter_tools/gradle/flutter.gradle
