//外部命令执行,拷贝apk到外部文件夹中.执行./gradlew build //命令生成apk 后,执行./gradlew apkcopy

//首先自定义一个task
task(name: 'apkcopy'){

//doLast都会在gradle的执行阶段执行doLast{
    def sourcePath=this.buildDir.path+'/outputs/apk'
    def desationPath='/Users/lichao/Downloads/'
    def command="mv -f ${sourcePath ${desationPath}}"
    //exec执行外部命令
    exec{        try{
            executable 'bash'
            args '-c',command
        }catch (Exception e){
            println('the command is execute failed.')
        }

    }
}

}

原文链接：http://www.apkbus.com/blog-953329-77648.html