java - FLEX-将AsyncToken转换为ArrayCollection

我是flex的新手，我似乎无法使它正常工作。本质上，我有一个选择框，它的可用数据取决于另一个组合框。

每个类别类型中都有多个处理类型。

这是我的代码：

组合框更改；更新选择框：

private function refreshAvailableTreatmentTypes():void {
        // this is the combo box
        fAccomplishment.habitatType = habitatTypeId.selectedIndex != -1 ? habitatTypeId.selectedItem as HabitatType : null;
        // fAccompRemote is a RemoteObject
        var treatmentList:ArrayCollection = fAccompRemote.getValidTreatments(fAccompForm.accomplishment, fAccomplishment.habitatType);

        if ( fAccompForm.categoryTypes != null ) {
            // All categories are always shown. These are passed to the form on construction.
            for each ( var currentCat:CategoryType in fAccompForm.categoryTypes ) {
                var catAdded:Boolean = false;
                /* loop through all the treatments in each Category and add them to
                 * the available list if they meet the criteria */
                for each ( var currentTreat:TreatmentType in currentCat.treatments ) {
                    if (currentTreat.id in treatmentList || treatmentList.length == 0) {
                        if (!catAdded) {
                            // fCatsAndTreats defined as a [Bindable] private var
                            fCatsAndTreats.addItem( currentCat );
                            catAdded = true;
                        }

                        fCatsAndTreats.addItem( currentTreat );
                    }
                }
            }
        }
    }

服务方式：

@RemotingInclude
public List<TreatmentType> getValidTreatments(Accomplishment accomp, HabitatType selectedHabitatType){
    if ( accomp == null || accomp.getGeometry() == null || accomp.getHabitatType() == null) {
        return new ArrayList<TreatmentType>();
    }

    Geometry accompGeo = accomp.getGeometry();
    List<TreatmentType> optionList = new ArrayList<TreatmentType>();
    String geomName = null;

    if ( accompGeo instanceof Point || accompGeo instanceof MultiPoint ) {
        geomName = "Point";
    } else if ( accompGeo instanceof LineString || accompGeo instanceof MultiLineString) {
        geomName = "Line";
    } else if ( accompGeo instanceof Polygon || accompGeo instanceof MultiPolygon ) {
        geomName = "Polygon";
    }

    Integer habTypeId = null;
    if (selectedHabitatType == null) {
        habTypeId = accomp.getHabitatType().getId();
    } else {
        habTypeId = selectedHabitatType.getId();
    }
    optionList = accomplishmentDao.getValidTreatments(geomName, habTypeId);

    return optionList;
}

TypeError：错误＃1034：类型强制转换失败：无法将mx.rpc :: AsyncToken @ 1af48641转换为mx.collections.ArrayCollection。

我该怎么做呢？我找到了THIS，但似乎对我没有太大帮助：。任何资源或信息将不胜感激。

最佳答案

对RemoteObject的调用是异步的-fAccompRemote.getValidTreatments的返回值是AsyncToken，它定义如何处理结果（返回结果时）。

远程调用返回时，它将调用结果处理程序还是错误处理程序，具体取决于调用是成功还是发生错误。

可以使用两种不同的方法来设置代码的响应处理程序-您可以在调用上添加事件监听器，也可以在调用返回的AsyncToken中设置响应器。

fAccompRemote.addEventListener(ResultEvent.RESULT, resultHandler);
fAccompRemote.getValidTreatments(...)

-要么-

var token:AsyncToken = fAccompRemote.getValidTreatments(...);
token.addResponder(new AsyncResponder(resultHandler, faultHandler));

无论哪种情况，resultHandler都会收到一个ResultEvent事件，其中包含您从getValidTreatments返回的ArrayCollection。

protected function resultHandler(event:ResultHandler):void
{
    var results:ArrayCollection = event.result as ArrayCollection;
}