详解Gradle构建过程

//1.setting.gradle 执行结束的监听
gradle.settingsEvaluated {
    println "settings.gradle 初始化执行结束"
}

//2.参与构建的Project对象创建完毕的监听
gradle.projectsLoaded {
    Gradle gradle ->
        println "settings.gradle 所有在 settings 中 include 的 Project 都创建完成了"
}

gradle.beforeProject {
    Project project ->
        println ">>>>>>>>gradle beforeProject "   project.name   " 配置开始前回调"
}

this.afterEvaluate {
    project ->
        println project.name   " 配置结束监听"
}

gradle.projectsEvaluated {
    gradle ->
        println "所有的project都配置完毕了，准备生成Task依赖关系"
}

gradle.taskGraph.whenReady {
    TaskExecutionGraph graph ->
        println "task 依赖关系已经生成"
}

gradle.taskGraph.beforeTask {
    Task task ->
        println "Project[${task.project.name}]--->Task[${task.name}] 在执行之前被回调"
}

gradle.taskGraph.afterTask {
    task, TaskState taskState ->
        //第二个参数表示 task 的状态，是可选的参数
        println "Project[${task.project.name}]--->Task[${task.name}] 在执行完毕,taskState[upToDate:${taskState.upToDate},skipped:${taskState.skipped},executed:${taskState.executed},didWork:${taskState.didWork}]"
}

gradle.buildFinished {
    BuildResult buildResult ->
        println "构建完毕"
}

//配置 app module
project(":app") {
    Project project ->
        project.afterEvaluate {
            //获取build task 任务
            Task buildTask = getBuildTask(project, ":app:build")
            //获取 preBuild 任务
            Task preBuildTask = getBuildTask(project, ":app:preBuild")

            def taskStartTime = 0
            def taskEndTime = 0

            //在preBuild task 中追加一个监听获取在preBuild执行之前的时间戳的 action 
            preBuildTask.doFirst {
                taskStartTime = System.currentTimeMillis()
            }
            //在build task 中追加一个监听获取执行完毕的时间戳的 action 
            buildTask.doLast {
                taskEndTime = System.currentTimeMillis()
                println "build task 执行时间：${taskEndTime - taskStartTime}"
            }
        }
}

/**
 * 获取该project对应的build任务
 * @param project
 * @return
 */
Task getBuildTask(Project project, String taskPath) {

    //获取该project管理task的容器
    TaskContainer taskContainer = project.getTasks()

    //拿到build的Task对象
    Task buildTask = taskContainer.getByPath(taskPath)

    return buildTask
}