Error:Unknown host 'downloads.gradle.org'. 
Enable Gradle 'offline mode' and sync project      

Learn about configuring HTTP proxies in Gradle

  1. 打开‘build,execution,deployment’,然后打开‘build tools’,取消选择‘offline work’,再点击确定
  2. rebuild the project
  3. 对于Mac系统,则是到preferences下进行前两项Error:Unknown host 'downloads.gradle.org'.  Enable Gradle 'offline mode' and sync project

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