Android Build在travis-ci中失败，无法从jcenter获得gradle

Question

当我建立travis-ci时。 它的日志出错了。 这是日志。

* What went wrong:
A problem occurred configuring root project 'Grain'.
> Could not resolve all dependencies for configuration ':classpath'.
   > Could not resolve com.android.tools.build:gradle:2.3.3.
     Required by:
         project :
      > Could not resolve com.android.tools.build:gradle:2.3.3.
         > Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/gradle/2.3.3/gradle-2.3.3.pom'.
            > Could not GET 'https://jcenter.bintray.com/com/android/tools/build/gradle/2.3.3/gradle-2.3.3.pom'.
               > Connect to 127.0.0.1:1080 [/127.0.0.1] failed: Connection refused (Connection refused)

这是我的.travis.yml

language: android

jdk:
  - oraclejdk8

sudo: true

android:
  components:
    - tools
    - platform-tools
    # The BuildTools version used by your project
    - build-tools-26.0.0
    # The SDK version used to compile your project
    - android-26
    - extra-android-m2repository
    - extra-android-support

在我的项目build.gradle中：

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
    }
}

allprojects {
    repositories {
        jcenter()
        maven { url "https://raw.githubusercontent.com/Pgyer/mvn_repo_pgyer/master" }
    }
}

为什么jcenter（）重定向到127.0.0.1:8080，我不知道要解决它。 感谢。

解决方案

我已经解决了，谢谢。

因为我曾经在gradle.properties设置了代理，忘记删除它。删除后，这个问题就消失了。