Kotlin Flow——有沒有類似LiveData的emitSource的？

Question

我有一個 function 參數 function 返回一個流，

fun <T> resultFlow(
  query: () -> Flow<T>,
  ... other parameters
): Flow<T> {
  return flow {

    val source = query()

    //!!!!    emit(source)   // I want something like emitSource like livedata has

   ...
   }

有沒有什么可以讓flow可以這樣發送的？

Answer 1

如果您想從 Flow 中發出所有項目，這正是emitAll()所做的：

fun <T> resultFlow(
  query: () -> Flow<T>,
  ... other parameters
): Flow<T> {
  return flow {

    val source = query()

    // Note that this will suspend until all values from the flow are collected.
    emitAll(source)
}