Gradle初识

Gradle 构建工具

1. 作用：定义和集成软件交付流程各个部分的一站式商店
2. 使用 wrapper ，保证每一个使用项目的人都使用同一个版本
3. 闭包 一种特殊的函数
4. 以逗号隔开的参数列表放在箭头的左侧

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基础语法

task groovy {}// 函数和变量的声明及调用def foo = "One million dollars"def myClosure = {    println "Hello from a closure"    println "The value of foo is $foo"}myClosure()//变量的复制 def bar = myClosuredef baz = barbaz()/*函数的嵌套*/def doubleIt = { x -> x + x}def applyTwice(func, arg){    func(func(arg))}foo = 5def fooDoubledTwice = applyTwice(doubleIt, foo)println "Applying doubleIt twice to $foo equals $fooDoubledTwice"/*列表的使用*/def myList = ["Gradle", "Groovy", "Android"]def printItem = {item -> println "List item: $item"}myList.each(printItem)myList.each{println "Compactly printing each list item: $it"}/*对类而言自动设置 set 和 get 方法*/class GroovyGreeter {    String greeting = "Default greeting"    def printGreeting(){println "Greeting: $greeting"}}def myGroovyGreeter = new GroovyGreeter()myGroovyGreeter.printGreeting()myGroovyGreeter.greeting = "My custom greeting"myGroovyGreeter.printGreeting()/* 使用 delegate 委推，拥有被委推对象的所有属性和方法*/def greetingClosure = {    printGreeting()    printGreeting()    String greeting = "Setting the greeting from a closure"    println greeting}// greetingClosure() // This doesn't work, because `greeting` isn't definedgreetingClosure.delegate = myGroovyGreetergreetingClosure() // This works as `greeting` is a property of the delegate