Flutter开发遇坑记录

 问题1 Android Studio flutter 项目运行报错
Launching lib/main.dart on Android SDK built for x86 in debug mode…
Initializing gradle…
Finished with error: ProcessException: Process “/Users/***/AndroidStudioProjects/flutter_app_one/android/gradlew” exited abnormally:
Downloading https://services.gradle.org/distributions/gradle-4.10.2-all.zip

Exception in thread “main” java.net

.ConnectException: Operation timed out (Connection timed out)
at java.net

.PlainSocketImpl.socketConnect(Native Method)
at java.net

.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net

.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net

.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net

.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net

.Socket.connect(Socket.java:589)
at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:673)
at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
at sun.net

.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net

.www.http.HttpClient.openServer(HttpClient.java:432

)
at sun.net

.www.http.HttpClient.openServer(HttpClient.java:527

)
at sun.net

.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264

)
at sun.net

.www.protocol.https.HttpsClient.New(HttpsClient.java:367

)
at sun.net

.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191

)
at sun.net

.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138

)
at sun.net

.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032

)
at sun.net

.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177

)
at sun.net

.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1546

)
at sun.net

.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474

)
at sun.net

.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254

)
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)
Command: /Users/***/AndroidStudioProjects/flutter_app_one/android/gradlew -v
主要看这句话

Finished with error: ProcessException: Process “/Users/***/AndroidStudioProjects/flutter_app_one/android/gradlew” exited abnormally:
Downloading https://services.gradle.org/distributions/gradle-4.10.2-all.zip

由于网的问题（翻墙），Android构建工具 gradle 下载失败了。
下载位置是

//{AppName}/android/gradle/wrapper/gradle-wrapper.properties

distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip

解决方法是，将这个文件 gradle-4.10.2-all.zip 下载到本地，再把上面的地址指向你本地的文件地址即可，记得重启。