android stuido ERROR: Unknown host 'jcenter.bintray.com

android studio 提示
ERROR: Unknown host ‘jcenter.bintray.com: nodename nor servname provided, or not known’. You may need to adjust the proxy settings in Gradle.
Enable Gradle ‘offline mode’ and sync project
Learn about configuring HTTP proxies in Gradle

解决方法
加上这条

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