android - 如何在 for 循环中启动 10 个协程并等待它们全部完成？

Question

我需要从数据库中填写对象列表。在将值(value)传递给项目之前，我希望所有项目都完成。这里是否有任何简短的方法调用 await() 来等待每个项目。我想做干净的代码，可能是一些设计模式或技巧？

    for (x in 0..10) {
        launch {
            withContext(Dispatchers.IO){
                list.add(repository.getLastGame(x) ?: MutableLiveData<Task>(Task(cabinId = x)))
            }

        }

    }
    items.value = list

Answer 1

coroutineScope { // limits the scope of concurrency
    (0..10).map { // is a shorter way to write IntRange(0, 10)
        async(Dispatchers.IO) { // async means "concurrently", context goes here
            list.add(repository.getLastGame(x) ?: MutableLiveData<Task>(Task(cabinId = x)))
        }
    }.awaitAll() // waits all of them
} // if any task crashes -- this scope ends with exception