近來遷移了一些專案到Android Studio，採用Gradle構建確實比原來的Ant方便許多。但是編譯時下載依賴的網速又著實令人蛋疼不已。

如果能切換到國內的Maven映象倉庫，如開源中國的Maven庫，又或者是換成自建的Maven私服，那想必是極好的。

一個簡單的辦法，修改專案根目錄下的build.gradle，將jcenter()或者mavenCentral()替換掉即可：

allprojects {
    repositories {
        maven{ url 'http://maven.oschina.net/content/groups/public/'}
    }
}
 

但是架不住專案多，難不成每個都改一遍麼？
自然是有省事的辦法，將下面這段Copy到名為init.gradle檔案中，並儲存到USER_HOME/.gradle/資料夾下即可。

allprojects{
    repositories {
        def REPOSITORY_URL = 'http://maven.oschina.net/content/groups/public'
        all { ArtifactRepository repo ->
            if(repo instanceof MavenArtifactRepository){
                def url = repo.url.toString()
                if (url.startsWith('https://repo1.maven.org/maven2') || url.startsWith('https://jcenter.bintray.com/')) {
                    project.logger.lifecycle "Repository ${repo.url} replaced by $REPOSITORY_URL."
                    remove repo
                }
            }
        }
        maven {
            url REPOSITORY_URL
        }
    }
}
 

init.gradle檔案其實是Gradle的初始化指令碼(Initialization Scripts)，也是執行時的全域性配置。

如果碰到如下錯誤，多嘗試幾次就好了：

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'fresco'.
> Could not resolve all dependencies for configuration ':classpath'.
   > Could not download httpcore.jar (org.apache.httpcomponents:httpcore:4.1
 
)
      > Could not get resource 'https://jcenter.bintray.com/org/apache/httpcomponents/httpcore/4.1/httpcore-4.1.jar'.
         > SSL peer shut down incorrectly

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED