我想将图像下载URL到我Mobile使用的Flex Mobile. 我找到了这个并尝试了这个：
<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" title="HomeView">
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
<fx:Model id="fileRefModel">
<file>
<creationDate>{""}</creationDate>
<creator>{""}</creator>
<modificationDate>{""}</modificationDate>
<name>{""}</name>
<size>{""}</size>
<type>{""}</type>
</file>
</fx:Model>
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import flash.net.FileReference;
[Bindable]
private var arrColl:ArrayCollection;
// URL of the file to download.
private const FILE_URL:String = "http://www.thebiblescholar.com/android_awesome.jpg";
private var fileRef:FileReference;
private var urlReq:URLRequest;
private function init():void {
// Initialize the array collection to an empty collection.
arrColl = new ArrayCollection();
// Set up the URL request to download the file specified by the FILE_URL variable
urlReq = new URLRequest(FILE_URL);
// Define file reference object and add a bunch of event listeners.
fileRef = new FileReference();
fileRef.addEventListener(Event.CANCEL, doEvent);
fileRef.addEventListener(Event.COMPLETE, doEvent);
fileRef.addEventListener(Event.OPEN, doEvent);
fileRef.addEventListener(Event.SELECT, doEvent);
fileRef.addEventListener(HTTPStatusEvent.HTTP_STATUS, doEvent);
fileRef.addEventListener(IOErrorEvent.IO_ERROR, doEvent);
fileRef.addEventListener(ProgressEvent.PROGRESS, doEvent);
fileRef.addEventListener(SecurityErrorEvent.SECURITY_ERROR, doEvent);
}
private function doEvent(evt:Event):void {
// Create shortcut to the FileReference object.
var fr:FileReference = evt.currentTarget as FileReference;
// Add event order and type to the DataGrid control.
arrColl.addItem({data:arrColl.length+1, type:evt.type, eventString:evt.toString()});
try {
// Update the Model.
fileRefModel.creationDate = fr.creationDate;
fileRefModel.creator = fr.creator;
fileRefModel.modificationDate = fr.modificationDate;
fileRefModel.name = fr.name;
fileRefModel.size = fr.size;
fileRefModel.type = fr.type;
// Display the Text control.
//txt.visible = true;
} catch (err:*) {
// uh oh, an error of sorts.
}
}
private function downloadSourceCodeZip():void {
// Clear existing array collection.
arrColl = new ArrayCollection();
fileRef.download(urlReq); // Here it gives me Exception >> (Suspended: TypeError: Error #1009: Cannot access a property or method of a null object reference.)
}
]]>
</fx:Script>
<s:Button label="Download" click="downloadSourceCodeZip()"/>
但我正在Suspended: TypeError: Error #1009: Cannot access a property or method of a null object reference.了解如何让这段代码为我工作>