[英]Asynchronous anonymous function in Kotlin? (lambda expressions)
我正在制作一個列表視圖(android)點擊時調用什么函數。
I want to get function is async or sync
。
在異步時阻塞。
甚至我想知道how attach async mark to kotlin lambda expression
。
class FunctionCaller_Content(text: List<String>,
val function: List< /*suspend? @async? */
( () -> Unit )?
>? = null)
/* I want both of async, sync function. */
{
fun isAsnyc(order: Int): Boolean
= // how to get this lambda expression{function?.get(order)} is async?
fun call(callerActivity: Activity, order: Int) {
val fun = function?.get(order)
fun()
if(isAsync(fun))
/* block click for async func */
}
}
和用法。
FunctionCaller_Content( listOf("Click to Toast1", "Click to Nothing"),
listOf(
{
Toast.makeText(this, "clicked", Toast.LENGTH_SHORT)
},
{
/*if async lambda expression, how can i do?*/
} )
您可以擁有List<suspend () -> Unit>
,但您不能在同一個列表中同時擁有掛起和非掛起功能,除非使用List<Any>
。 我建議改用兩個單獨的列表。 另一種解決方案是使用“代數數據類型”:
sealed class SyncOrAsync // can add methods here
class Sync(val f: () -> Unit) : SyncOrAsync
class Async(val f: suspend () -> Unit) : SyncOrAsync
class FunctionCaller_Content(text: List<String>,
val function: List<SyncOrAsync>? = null)
{
fun call(callerActivity: Activity, order: Int) {
val fun = function?.get(order)
if(fun is Async)
/* block click for async func */
}
}
FunctionCaller_Content(
listOf("Click to Toast1", "Click to Nothing"),
listOf(Sync {
Toast.makeText(this, "clicked", Toast.LENGTH_SHORT)
},
Async {
// your async code
})
但是,如果您無論如何都要阻止,我只會使用List<() -> Unit>
和
listOf({
Toast.makeText(this, "clicked", Toast.LENGTH_SHORT)
},
{
runBlocking {
// your async code
}
})
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