[英]Suspend kotlin coroutine async subfunction
I have an async CoroutineScope
in which could be (by condition) a call to a subfunction which returns its result in an async Unit
我有一个异步CoroutineScope
,其中可以(通过条件)调用子函数,该子函数在异步Unit
返回其结果
How can I wait for the returned result and return it outside of the async Unit
. 如何等待返回的结果并将其返回到异步Unit
。 Therefore await the call to the Unit
by the subfunction. 因此等待子功能对Unit
的调用。
Example: 例:
GlobalScope.launch {
var value: Int = 0
if (condition) {
// the subFunction has a Unit<Int> as return type
subFunction() { result ->
value = result
}
}
Log.v("LOGTAG", value.toString())
}
How can I wait for the subFunction
to finish executing before continuing the code, or directly assign the result value to the variable? 如何在继续代码之前等待subFunction
功能完成执行,或者直接将结果值分配给变量?
subFunction
must not be a suspend
function, however it could be embedded into a helper function. subFunction
不能是suspend
函数,但它可以嵌入到辅助函数中。
(the code has to run in an Android enviroment) (代码必须在Android环境中运行)
You can do this, converting your callback to a suspend function 您可以这样做,将回调转换为暂停功能
GlobalScope.launch {
var value: Int = 0
if (condition) {
// the subFunction has a Unit<Int> as return type
value = subFunctionSuspend()
}
Log.v("LOGTAG", value.toString())
}
suspend fun subFunctionSuspend() = suspendCoroutine { cont ->
subFunction() { result ->
cont.resume(result)
}
}
Not very nice but working solution with channels: 不太好但是有渠道的工作解决方案:
GlobalScope.launch {
val channel = Channel<Int>()
if (condition) {
// the subFunction has a Unit<Int> as return type
subFunction() { result ->
GlobalScope.launch {
channel.send(result)
channel.close()
}
}
}
for (i in channel) {
println(i)
}
}
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