如何在暂停的协程流中使用回调？

Question

I am using coroutines flow and I need to call a suspended emit from within a non-suspended callback. I don't have control over the callback and can't make that interface method suspended. Is it possible to do this?

import kotlinx.coroutines.flow.flow

fun foo() = flow {
    someLibraryObject.listenToSomeEvent(object: SomeCallback {
        override fun bar() {
            emit("Some result")
        }
    }
}

interface SomeCallback {
   fun bar()
}

Answer 1

callbackFlow can be used in this case. Note that it's currently experimental.

fun foo() = callbackFlow {
    someLibraryObject.listenToSomeEvent(object: SomeCallback {
        override fun bar() {
             offer("Some result")
        }
    }
}

For further details you can refer to this