一个这样的库函数是withContext，它是你需要解决你的问题的那个。它用你传递给它的块创建另一个协程，把那个协程提交给你指定的其他上下文（一个有用的例子是Dispatchers.Default），然后挂起当前的协程，直到另一个协程完成。这正是你需要把一个阻塞调用变成一个可挂起的函数。在你的例子中，它看起来像这样：
Coroutines always execute in some context that is a set of various elements. Below are main elements of coroutine context Job – models a cancellable workflow with multiple states and a life-cycle that culminates in its completion. Launch returns a Job object. When you launch a coroutine, you...
/*** Defines start options for coroutines builders.* It is used in `start` parameter of [launch][CoroutineScope.launch], [async][CoroutineScope.async], and other coroutine builder functions.** The summary of coroutine start options is:* * [DEFAULT] -- immediately schedules coroutine for ...
launch { //在后台执行 val result = getNetData() //修改UI log(result) } } //将耗时任务切到IO线程去执行 private suspend fun getNetData() = withContext(Dispatchers.IO) { //模拟网络耗时 delay(1000) //模拟返回结果 "{}" } } 所有CoroutineScope的初始化和取消都已经为我们完成了,只需要在代...
问Kotlin协同线-多个错误导致在到达catch块之前崩溃。EN相比较来说使用run显得比较简洁，但let的优势在于...
If several coroutines are waiting to be executed next, the one scheduled after the smallest delay will be chosen. The virtual time will automatically advance to the point of its resumption. @TestfuntestWithMultipleDelays()=runTest { launch { delay(1_000)println("1.$currentTime")//1000delay...
viewModelScope.launch {//在后台执行valresult = getNetData()//修改UIlog(result) } }//将耗时任务切到IO线程去执行privatesuspendfungetNetData()= withContext(Dispatchers.IO) {//模拟网络耗时delay(1000)//模拟返回结果"{}"} } 所有CoroutineScope的初始化和取消都已经为我们完成了,只需要在代码里面使用vi...
Using multiple test dispatchers simultaneously is supported. For the dispatchers to have a shared knowledge of the virtual time, either the sameTestCoroutineSchedulershould be passed to each of them, or all of them should be constructed afterDispatchers.setMainis called with some test dispatcher....
这个操作符能规避整个系统崩溃风险。协程调度逻辑的选择直接影响应用整体性能：当UI开发者在主线程Dispatchers上长时间运算时会导致界面卡顿。这里需要建立关键对应关系——数据库读写适用于线程池型Dispatcher，JSON数解析这种耗时计算应使用withContext切换非主线程。需给出参数化操作的实现样板：
使用suspend函数检索Flow，将两者结合起来几乎没有意义。这是因为Flow本身是一个轻量级对象，通常不需要任何...