I need to call a suspending function inside a suspendCoroutine block, before I call continuation.resume().
What is the appropriate way of doing that?
private suspend fun someFunction() = suspendCoroutine { cont ->
//...
val myResult = mySuspendingFunction() //<--- The IDE says "Suspension functions can be called only within coroutine body"
cont.resume(myResult)
}
不能在suspendCoroutine块中调用suspend函数，因为它接受非挂起块作为参数:
suspend inline fun <T> suspendCoroutine(
crossinline block: (Continuation<T>) -> Unit
): T
'suspendCoroutine' mainly used when we have some legacy code with callbacks, e.g.:
suspend fun getUser(id: String): User = suspendCoroutine { continuation ->
Api.getUser(id) { user ->
continuation.resume(user)
}
}
If function someFunction() doesn't call Api with callbacks then you should reconsider your approach getting rid of 'suspendCoroutine':
private suspend fun someFunction() {
// ...
val myResult = mySuspendingFunction()
// ...
}
如果您仍要使用suspendCoroutine移动呼叫，请使用suspendCoroutine块中的mySuspendingFunction:
private suspend fun someFunction(): String {
val myResult = mySuspendingFunction()
return suspendCoroutine { cont ->
//...
cont.resume(myResult)
}
}
suspend fun mySuspendingFunction(): String {
delay(1000) // simulate request
return "result"
}