我实现 IList 接口，如
[Bindable]
public class MemList implements IList
{
public function MemList()
{
}
public function get length():int
{
var size:int = 5000;
return size;
}
public function addItem(item:Object):void
{
}
public function addItemAt(item:Object, index:int):void
{
}
public function getItemAt(index:int, prefetch:int=0):Object
{
var obj:Object = new Object();
obj.value = ByteStr(); // this function return a string
return obj;
}
public function getItemIndex(item:Object):int
{
return 0;
}
public function itemUpdated(item:Object, property:Object=null, oldValue:Object=null, newValue:Object=null):void
{
}
public function removeAll():void
{
}
public function removeItemAt(index:int):Object
{
return null;
}
public function setItemAt(item:Object, index:int):Object
{
return null;
}
public function toArray():Array
{
return null;
}
public function addEventListener(type:String, listener:Function, useCapture:Boolean=false, priority:int=0, useWeakReference:Boolean=false):void
{
}
public function removeEventListener(type:String, listener:Function, useCapture:Boolean=false):void
{
}
public function dispatchEvent(event:Event):Boolean
{
return false;
}
public function hasEventListener(type:String):Boolean
{
return false;
}
public function willTrigger(type:String):Boolean
{
return false;
}
}
并将其对象作为数据提供者提供给 DataGroup，在 Mxml 文件中我正在这样做
<fx:Script><![CDATA[
[Bindable]private var list:MemList = new MemList();
protected function onBtnShow(event:MouseEvent):void
{
send(somenumber, MAX_SIZE, onShowResp);//get data from network
}
private function onShowResp(retVal:uint, ba:ByteArray):void
{
//this function called when ba bytearray is filled with data.
}
]]></fx:Script>
<s:Button id="btnShow" label="Show" click="onBtnShow(event)"/>
<s:Scroller verticalScrollPolicy="auto" id="aScroller"
liveScrolling="false">
<s:DataGroup id="dgMemView" width="100%" height="350"
dataProvider="{list}"
clipAndEnableScrolling="true"
itemRenderer="ItemRenderer"
>
<s:layout>
<s:VerticalLayout useVirtualLayout="true"/>
</s:layout>
</s:DataGroup>
</s:Scroller>
public function ByteStr(loc:uint):String
{
//this function can access ba bytearray filled with data. do some processing
on that data and return a string.
return string;
}
我的问题是当应用程序运行数据组没有显示任何内容时，因为 ba （字节数组）中没有必须用网络数据填充的数据。当我按下显示按钮时，它会发出请求并用数据填充 ba (bytearray)。如何通知 Datagroup 数据已更改。我正在使用 Flash Builder 4.5。谢谢