Connection timed out: connect. If you are behind an HTTP proxy, please……

  由於不可訪問外網，不能下載gredle,找了好久終於找到一個解決辦法。   Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve com.android.tools.build:gradle:3.5.3. Caused by: org.gradle.api.resource

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