Kotlin1.3版本的协程

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Kotlin1.3版本的协程


协程的开发人员 Roman Elizarov 是这样描述协程的:协程就像非常轻量级的线程。线程是由系统调度的,线程切换或线程阻塞的开销都比较大。而协程依赖于线程,但是协程挂起时不需要阻塞线程,几乎是无代价的,协程是由开发者控制的。所以协程也像用户态的线程,非常轻量级,一个线程中可以创建任意个协程。

使用Kotlin的协程

添加依赖:coroutines库在Kotlin1.3版本的时候已经升级为稳定版,命名为1.0.0,目前最新版是1.0.1

1implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.0'

也可以添加Android的依赖:

1implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.0'

开启协程的方法:

  1. GlobalScope.launch

     1 fun main(args: Array<String>) {
    2     GlobalScope.launch {
    3         // 非阻塞线程1s
    4         delay(1000L)
    5         println("This is a coroutines ¨E123ETimeUtil.getTimeDetail()¨E125E")E125E//线2sJVMThread.sleep(2000L)println("mainend{TimeUtil.getTimeDetail()}")
    6     }
    7     // 阻塞线程2s,保证JVM存活,协程可正常执行完
    8     Thread.sleep(2000L)
    9     println("main end <span class="katex-html" aria-hidden="true" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="strut" style="height:1em;vertical-align:-0.25em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">¨<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E123<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E<span class="mord mathit" style="margin-right:0.13889em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">T<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="margin-right:0.10903em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">U<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l.<span class="mord mathit" style="margin-right:0.03588em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">g<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="margin-right:0.13889em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">T<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">D<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l()¨<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E125<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E"<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E//<span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">线<span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">s<span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit 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inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord mathit" style="margin-right:0.13889em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">T<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">h<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">d.<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">s<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">p(2000<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">L)<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">p<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n("<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">d{TimeUtil.getTimeDetail()}")
    10 }
    11
    12 // 输出
    13 // This is a coroutines 10:49:58
    14 // main end 10:49:59
    15</span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.13889em;"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord mathit" style="margin-right:0.10903em;"></span class="mord mathit" style="margin-right:0.22222em;"></span class="mord mathit" style="margin-right:0.09618em;"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord mathit"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.13889em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.03588em;"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.10903em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.13889em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="strut" style="height:1em;vertical-align:-0.25em;"></span class="katex-html" aria-hidden="true">

    在线程环境中可直接使用CoroutineScope.launch启动一个新的协程,它的参数有如下三个,分别为:

  • context: CoroutineContext = EmptyCoroutineContext:协程上下文

  • start: CoroutineStart = CoroutineStart.DEFAULT:启动模式,默认是DEAFAULT,也就是创建就启动;还有一个是LAZY,意思是等你需要它的时候,再调用启动。在Kotlin 1.3版本中,还有ATOMICUNDISPATCHED两个额外的模式,但是现在还是实验版,这里不多介绍。

  • block: suspend CoroutineScope.() -> Unit:闭包参数,定义协程内需要执行的操作。

    返回值为Job对象。Job有如下几个重要的方法,分别为:

  1. job.start()可配合LAZY启动一个协程

     1  fun main(args: Array<String>){
    2      val job = GlobalScope.launch(start = CoroutineStart.LAZY) {
    3          println("this is a job")
    4      }
    5      job.start()
    6      Thread.sleep(1000L)
    7  }
    8
    9  // 输出
    10  // this is a job
  2. job.join()等待协程执行完毕

    1  suspend fun main(args: Array<String>){
    2      val job = GlobalScope.launch {
    3          println("this is a job")
    4      }
    5      job.join()
    6  }
    7
    8  // 输出
    9  // this is a job

    注意:join()函数是一个挂起函数,所有main必须被suspend修饰。

  3. job.cancel()取消一个协程

    1  suspend fun main(args: Array<String>){
    2      val job = GlobalScope.launch {
    3          println("this is a job")
    4      }
    5      job.cancel()
    6      job.join()
    7  }
    8
    9  // 无输出,协程被取消了
  4. job.cancelAndJoin()等待协程执行完毕然后再取消

    1  suspend fun main(args: Array<String>){
    2      val job = GlobalScope.launch {
    3          println("this is a job")
    4      }
    5      job.cancelAndJoin()
    6  }
    7
    8  // 输出
    9  // this is a job

    job.cancelAndJoin()也是一个挂起函数。

    从上面的代码和输出可以看到,协程中的输出和main中的输出只相差了1s,也就说明了为什么delay(1000L)是非阻塞的。delay()函数类似于Thread.sleep(),但是它不阻塞(non-blocking)线程,它是一个被suspend修饰的挂起函数,挂起函数只能被挂起函数调用或协程中调用。  


  1. GlobalScope.async

     1suspend fun main(args: Array<String>) {
    2   val deferred = GlobalScope.async {
    3       delay(1000L)
    4       println("This is async ¨E123ETimeUtil.getTimeDetail()¨E125E")return@async"taonce"E125Eprintln("mainstart{TimeUtil.getTimeDetail()}")
    5       return@async "taonce"
    6   }
    7   println("main start <span class="katex-html" aria-hidden="true" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="strut" style="height:1em;vertical-align:-0.25em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">¨<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E123<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E<span class="mord mathit" style="margin-right:0.13889em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">T<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="margin-right:0.10903em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">U<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l.<span class="mord mathit" style="margin-right:0.03588em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">g<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="margin-right:0.13889em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">T<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">D<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l()¨<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E125<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E"<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">u<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n@<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">s<span class="mord mathit" style="margin-right:0.03588em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">y<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">c"<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">o<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">c<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e"<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">p<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n"<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">s<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t{TimeUtil.getTimeDetail()}")
    8   val result = deferred.await()
    9   println("async result is result")println("mainendresult")
    10   println("main end <span class="katex-html" aria-hidden="true" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="strut" style="height:1em;vertical-align:-0.25em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">s<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">u<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t"<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">p<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n"<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">d{TimeUtil.getTimeDetail()}")
    11}
    12// 输出
    13// main start 15:27:19:668
    14// This is async 15:27:20:652
    15// async result is taonce
    16// main end 15:27:20:657
    17</span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="strut" style="height:1em;vertical-align:-0.25em;"></span class="katex-html" aria-hidden="true"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.03588em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.13889em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.03588em;"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.10903em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.13889em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="strut" style="height:1em;vertical-align:-0.25em;"></span class="katex-html" aria-hidden="true">

    asynclaunch参数是一模一样的,不同的是async返回的是Deferred对象,它继承了Job接口,所以说Job有的它都有,并且还额外增加了一个方法:

    public suspend fun await(): T这个方法接收的是async闭包中返回的值。如果闭包中需要返回一个值那么我们就需要考虑用async了。


  1. runBlocking

    runBlocking的最大特点就是它的delay()可以阻塞当前的线程,和Thread.sleep()有着相同的效果,看下面代码:

     1 fun main(args: Array<String>) {
    2     runBlocking {
    3         // 阻塞1s
    4         delay(1000L)
    5         println("This is a coroutines ¨E123ETimeUtil.getTimeDetail()¨E125E")E125E//2sThread.sleep(2000L)println("mainend{TimeUtil.getTimeDetail()}")
    6     }
    7     // 阻塞2s
    8     Thread.sleep(2000L)
    9     println("main end <span class="katex-html" aria-hidden="true" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="strut" style="height:1em;vertical-align:-0.25em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">¨<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E123<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E<span class="mord mathit" style="margin-right:0.13889em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">T<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="margin-right:0.10903em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">U<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l.<span class="mord mathit" style="margin-right:0.03588em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">g<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="margin-right:0.13889em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">T<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">D<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l()¨<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E125<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E"<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E<span class="mord mathit" style="margin-right:0.05764em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">E//<span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"><span class="mord cjk_fallback" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">s<span class="mord mathit" style="margin-right:0.13889em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">T<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">h<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">d.<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">s<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">p(2000<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">L)<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">p<span class="mord mathit" style="margin-right:0.02778em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">r<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">t<span class="mord mathit" style="margin-right:0.01968em;" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">l<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n("<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">m<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">a<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">i<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">e<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">n<span class="mord mathit" style="font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">d{TimeUtil.getTimeDetail()}")
    10 }
    11 // 输出
    12 // This is a coroutines 11:00:51
    13 // main end 11:00:53
    14</span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.13889em;"></span class="mord mathit"></span class="mord cjk_fallback"></span class="mord cjk_fallback"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.13889em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.03588em;"></span class="mord mathit" style="margin-right:0.01968em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.10903em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.13889em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="strut" style="height:1em;vertical-align:-0.25em;"></span class="katex-html" aria-hidden="true">

    乍一看,这不和上面的launch一样么,只是替换成了runBlocking而已,但是大家可以仔细看一看输出,两次输出之间的时间差为2s,也就是说runBlocking中的delay(1000L)确确实实的把当前线程给阻塞了,让当前线程也睡眠了1s。而通过launch开启的协程中却不是如此,这就是二者的不同之处之一。

    所以我们一般用runBlocking来桥接普通阻塞代码和挂起风格的非阻塞代码,在runBlocking闭包里面启动另外的协程。


实际运用

就拿最常用的网络请求为例吧,如果我们不用Kotlin的协程来实现,我们可以用ThredRxJava等等很多种方法,那么我们来看看协程是怎么实现的吧。

 1class MainActivity : AppCompatActivity() {
2
3    override fun onCreate(savedInstanceState: Bundle?) {
4        super.onCreate(savedInstanceState)
5        setContentView(R.layout.activity_main)
6        coroutine.setOnClickListener { click() }
7    }
8
9    private fun click() = runBlocking {
10        GlobalScope.launch(Dispatchers.Main) {
11            coroutine.text = GlobalScope.async(Dispatchers.IO) {
12                // 比如进行了网络请求
13                // 放回了请求后的结构
14                return@async "main"
15            }.await()
16        }
17    }
18}

Async()在IO线程中去执行网络请求,然后通过await()返回请求结果,用launch()在主线程中更新UI就行了。

其中我们用了Dispatchers来指定协程所在的线程,目前Dispatchers有三种:MainIODefault

  • Default:如果没有指定具体的Dispatchers都会使用默认的,它使用的是最大的线程数。

  • IO:用来调度阻塞的协程

  • Main:就是常说的UI线程了,是Android特有的。

协程的知识点还有很多很多,这里只能带大家简单了解一下稳定版的coroutines,想要了解更多大家可以去Kotlin中文文档详细学习。下面贴出中文文档地址。

https://www.kotlincn.net/docs/reference/coroutines/basics.html


写在最后

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Thank You!

--Taonce

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Kotlin1.3版本的协程
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原文始发于微信公众号(Taonce):Kotlin1.3版本的协程