Task 在哪？

//一般我们使用的task 都是使用Project 下的 task 方法， 具体可以进入 org.gradle.api.project 进行查看
package org.gradle.api

/**
     * <p>Creates a {@link Task} with the given name and adds it to this project. Calling this method is equivalent to
     * calling {@link #task(java.util.Map, String)} with an empty options map.</p>
     *
     * <p>After the task is added to the project, it is made available as a property of the project, so that you can
     * reference the task by name in your build file.  See <a href="#properties">here</a> for more details</p>
     *
     * <p>If a task with the given name already exists in this project, an exception is thrown.</p>
     *
     * @param name The name of the task to be created
     * @return The newly created task object
     * @throws InvalidUserDataException If a task with the given name already exists in this project.
     */
    Task task(String name) throws InvalidUserDataException;

Task 简单使用

声明Task

定义一个Task， 并打印版本

task printVersion {
    //定义优先执行的方法
    doFirst {
        println "1 preparing print version"
    }

    doLast {
        println "2 Version : $version"
    }
}

另一种定义方法，这里需要注意的是，printVersion 必须已经定义好了， 比如上面的定义和下面的代码一起使用。 否则会有报错，Gradle不会自动识别printVersion 为一个task

printVersion.doLast {
    println "3 using Logger print version"
    logger.quiet("Version : $version")
}

声明带参数的Task

//参数的方式
task printVersionWithParam(group: 'versioning', description: 'prints version') {
    doLast {
        println "balabala ... ..."
    }
}
//setter的方式
task printVersionUsingSetter() {

    group = 'versioning'
    description = 'prints version'

    doLast {
        println "balabala ... ..."
    }
}

task 供使用的参数有以下参数，比较简单，就不多说了

    String TASK_NAME = "name";
    String TASK_DESCRIPTION = "description";
    String TASK_GROUP = "group";
    String TASK_TYPE = "type";
    String TASK_DEPENDS_ON = "dependsOn";
    String TASK_OVERWRITE = "overwrite";
    String TASK_ACTION = "action";
    String TASK_CONSTRUCTOR_ARGS = "constructorArgs";

运行 task

// 查看所有task
gradle(w) -q taks --all
// 执行你定义个task，以刚才我们定义的一个task为例
gradle(w) printVersionUsingSetter