Kotlin Flow 收集后无法执行代码

I'm trying to execute some code after calling collect on a Flow<MyClass>. I'm still kind of new to using Flows so I don't understand why the code after the function doesn't get called.

我如何使用流程:

incidentListener = FirebaseUtils.databaseReference
                      .child(AppConstants.FIREBASE_PATH_AS)
                      .child(id)
                      .listen<MyClass>() //This returns a Flow<MyClass?>?

How I consume the Flow:

private suspend fun myFun() {
   viewmodel.getListener()?.collect { myClass->
       //do something here
   }
   withContext(Dispatchers.Main) { updateUI() } //the code never reaches this part
}

How myFun() is called:

CoroutineScope(Dispatchers.IO).launch {
   myFun()
}

就我试图让它工作而言，我试图关闭协同程序上下文，但没有成功.我假设流的工作方式不同于常规的协同程序.

Update:

我正在使用这段代码通过Firebase进行监听.我不知道它是否有用，但也许是我实现它的方式导致了这个问题？

inline fun <reified T> Query.listen(): Flow<T?>? =
callbackFlow {
    val valueListener = object : ValueEventListener {
        override fun onCancelled(databaseError: DatabaseError) {
            close()
        }

        override fun onDataChange(dataSnapshot: DataSnapshot) {
            try {
                val value = dataSnapshot.getValue(T::class.java)
                offer(value)
            } catch (exp: Exception) {
                if (!isClosedForSend) offer(null)
            }
        }
    }
    addValueEventListener(valueListener)
    awaitClose { removeEventListener(valueListener) }
}