Question

我有想要听取变化的项目的地图并做出一些动作我想在单独的线程中完成它，但地图已更改，但我可以听取它的更改

val removedItemList: HashMap<Int,Item> = HashMap()

Flowable.fromArray(removedShoppingList.values).subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe({ items ->
      Log.i("items_removed", " " + items + items.size);
    })

Answer 1

请尝试以下代码：

// When HashMap changed, this class emitted.
class MapEvent(val event: EventType, val item: Item?){
    enum class EventType {
        ADD,
        REMOVE
    }
}

~~~

// PublishSubject emits changed event.
val subject = PublishSubject.create<MapEvent>()

// Subscribe changed event.
// When emits changed event by PublishSubject, print log.
val obervable = subject.hide().share()
obervable.subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe {it -> Log.i("HashMap Changed", "Event: ${it.event}, Item: ${it.item}")}

val itemList: HashMap<Int, Item> = HashMap()
val addedItem = Item()

// If you add or remove HashMap item, then execute onNext method in order to emit changed event.
itemList.put(1, addedItem)
subject.onNext(MapEvent(MapEvent.EventType.ADD, addedItem))
val removedItem = itemList.remove(1)
subject.onNext(MapEvent(MapEvent.EventType.REMOVE, removedItem))

如何在单独的线程中监听HashMap值的变化使其成为Flowable？

1 个答案: