android studio error错误:连接超时

Question

我只是在android studio中创建一个新项目并添加gcm模块.
我一直在给出这个错误信息

Error:Connection timed out: connect. If you are behind an HTTP proxy, please configure the proxy settings either in IDE or Gradle.      

我不使用任何代理.
任何人都可以帮我这个吗？

重建我的项目后立即更新我给出了这个错误

Error:A problem occurred configuring project ':app'.    
 A problem occurred configuring project ':backend'.
Could not resolve all dependencies for configuration ':backend:classpath'.
   Could not resolve com.google.appengine:gradle-appengine-plugin:1.9.18.
    Required by:
        PushStart:backend:unspecified
      Could not resolve com.google.appengine:gradle-appengine-plugin:1.9.18.
      Could not get resource 'https://jcenter.bintray.com/com/google/appengine/gradle-appengine-plugin/1.9.18/gradle-appengine-plugin-1.9.18.pom'.
      Could not GET 'https://jcenter.bintray.com/com/google/appengine/gradle-appengine-plugin/1.9.18/gradle-appengine-plugin-1.9.18.pom'.
      Connection to https://jcenter.bintray.com refused

Answer 1

这篇SO帖子的答案可能会对你有所帮助.

您应该gradle.properties在https setings配置的文件中添加以下行

    systemProp.https.proxyHost=www.somehost.org
    systemProp.https.proxyPort=8080
    systemProp.https.proxyUser=userid
    systemProp.https.proxyPassword=password
    systemProp.https.nonProxyHosts=*.nonproxyrepos.com|localhost

Answer 2

只需尝试无效缓存..转到文件 - >使高速缓存/重新启动无效 - >选择"无效并重新启动".