build.gradle（project）

buildscript {
    repositories {   //仓库
        jcenter()  //库
    }
    dependencies {  //依赖
        classpath 'com.android.tools.build:gradle:1.3.0'     //参看图1， 根据你安装的gradle生成

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {   //自动生成的部分
    repositories {
        jcenter()
    }
}