是科特林流量'；s Collect是唯一的内部kotlinx.coroutines API？

直接从

当我添加

@InternalCoroutinesApi

@InternalCoroutinesApi
fun main() = runBlocking<Unit> {
    println("Calling simple function...")
    val flow = simple()
    println("Calling collect...")
    flow.collect { value -> println(value) }
    println("Calling collect again...")
    flow.collect { value -> println(value) }
}

我使用的是Kotlin版本1.4.21

    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.4.2"
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.2'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1'
    testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.4.2'

---

我是否做错了什么，以致无法在Android Studio中编译示例代码？

用

collectLatest

替换

collect

。答案是，不，

collect

不仅仅是内部kotlinx.coroutines API。错误消息具有误导性

根据@ir42的评论，

添加import kotlinx.coroutines.flow.collect

解决问题

其他信息，为什么我没有选择

collectedlatest

作为答案

collect

和

collectLatest

是不同的

使用这个例子

fun simple(): Flow<Int> = flow { // flow builder
    for (i in 1..3) {
        delay(100) // pretend we are doing something useful here
        emit(i) // emit next value
    }
}

fun main() = runBlocking<Unit> {
    // Launch a concurrent coroutine to check if the main thread is blocked
    launch {
        for (k in 1..3) {
            println("I'm not blocked $k")
            delay(100)
        }
    }
    // Collect the flow
    simple().collect { value -> println(value) } 
}

依照

但是

收集最新的

fun simple(): Flow<Int> = flow { // flow builder
    for (i in 1..3) {
        delay(100) // pretend we are doing something useful here
        emit(i) // emit next value
    }
}

fun main() = runBlocking<Unit> {
    // Launch a concurrent coroutine to check if the main thread is blocked
    launch {
        for (k in 1..3) {
            println("I'm not blocked $k")
            delay(100)
        }
    }
    // Collect the flow
    simple().collectLatest { value -> println(value) } 
}

添加
import kotlinx.coroutines.flow.collect
@quetzalcatl，这个标题很有意义，因为显然Kotlin
collect
不仅仅是内部的kotlinx.collection.API。是错误信息误导了一个人，使他认为这是错误的，并采取了错误的解决方案。嗯。。有趣。谢谢你的澄清。我想知道为什么会生成这样一个“这是一个内部kotlinx.coroutines API，不应该从kotlinx.coroutines外部使用”。是否有另一个“collect”功能已经可用（但不适合），或者这个错误是完全不同的原因造成的？
    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.4.2"
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.2'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1'
    testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.4.2'

fun simple(): Flow<Int> = flow { // flow builder
    for (i in 1..3) {
        delay(100) // pretend we are doing something useful here
        emit(i) // emit next value
    }
}

fun main() = runBlocking<Unit> {
    // Launch a concurrent coroutine to check if the main thread is blocked
    launch {
        for (k in 1..3) {
            println("I'm not blocked $k")
            delay(100)
        }
    }
    // Collect the flow
    simple().collect { value -> println(value) } 
}

I'm not blocked 1
1
I'm not blocked 2
2
I'm not blocked 3
3

fun simple(): Flow<Int> = flow { // flow builder
    for (i in 1..3) {
        delay(100) // pretend we are doing something useful here
        emit(i) // emit next value
    }
}

fun main() = runBlocking<Unit> {
    // Launch a concurrent coroutine to check if the main thread is blocked
    launch {
        for (k in 1..3) {
            println("I'm not blocked $k")
            delay(100)
        }
    }
    // Collect the flow
    simple().collectLatest { value -> println(value) } 
}

I'm not blocked 1
I'm not blocked 2
1
I'm not blocked 3
2