Android使用阿里鏡像

在學習room時項目一直在編譯中，最后排查發現是依賴沒有下載完導致。隨后查詢將依賴下載源改為阿里源，即可正常使用。

需要修改 build.gradle （project），改為以下內容：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        maven { url 'http://maven.aliyun.com/nexus/content/repositories/jcenter' }
        google()
        //jcenter()
        
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.3'
        
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        maven { url 'http://maven.aliyun.com/nexus/content/repositories/jcenter' }
        google()
        //jcenter()
        
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}