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抱歉,我是使用 Adob​​e Air 的新手,我不知道为什么我的

addEventListener(NativeDragEvent.NATIVE_DRAG_ENTER, onDragIn);

addEventListener(NativeDragEvent.NATIVE_DRAG_DROP, onDragDrop);

行未注册。它给了我一个错误,上面写着“调用可能未定义的方法 addEventListener”

我正在尝试加载应用程序并使用以下代码示例:http: //www.mikechambers.com/blog/2007/11/07/air-example-native-drag-and-drop/

这是我的DragAndDropExampleClass.as:http://pastebin.com/SNZyW5Cx

提前致谢!

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1 回答 1

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在 Mike Chamber 的示例中,文件中的代码DragAndDropExampleClass旨在用作内联代码,它不是实际的类。

因此,您删除了包/类指令。那应该已经解决了您遇到的问题(如评论跟踪中所述)。

然而,在脚本标签中包含内联代码<mx:Script source="DragAndDropExampleClass.as" />是一种不好的做法,并且可能会导致您的困惑。我已将您的两个文件合并到下面的一个应用程序中。它与 Mike Chambers 的例子完全一样,只是在一个文件中。也许这会有所帮助。我已经运行了这个应用程序并且它可以工作。

注意:我是用 Flash Builder 4.6 编译的,所以代码有点不同。如果您使用的是 Flex 3,请尝试像我一样组合 Mike 的两段代码。

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
                       xmlns:s="library://ns.adobe.com/flex/spark" 
                       xmlns:mx="library://ns.adobe.com/flex/mx"
                       creationComplete="onCreationComplete()">
    <fx:Script>
        <![CDATA[
            import flash.desktop.ClipboardFormats;
            import flash.desktop.NativeDragManager;
            import flash.display.Sprite;
            import flash.events.NativeDragEvent;
            import flash.filesystem.File;
            import flash.filesystem.FileMode;
            import flash.filesystem.FileStream;

            //called when app has initialized and is about to display
            protected function onCreationComplete():void
            {
                //register for the drag enter event
                addEventListener(NativeDragEvent.NATIVE_DRAG_ENTER, onDragIn);

                //register for the drag drop event
                addEventListener(NativeDragEvent.NATIVE_DRAG_DROP, onDragDrop);
            }

            //called when the user drags an item into the component area
            protected function onDragIn(e:NativeDragEvent):void
            {
                //check and see if files are being drug in
                if(e.clipboard.hasFormat(ClipboardFormats.FILE_LIST_FORMAT))
                {
                    //get the array of files
                    var files:Array = e.clipboard.getData(ClipboardFormats.FILE_LIST_FORMAT) as Array;

                    //make sure only one file is dragged in (i.e. this app doesn't
                    //support dragging in multiple files)
                    if(files.length == 1)
                    {
                        //accept the drag action
                        NativeDragManager.acceptDragDrop(this);
                    }
                }
            }

            //called when the user drops an item over the component
            protected function onDragDrop(e:NativeDragEvent):void
            {
                //get the array of files being drug into the app
                var arr:Array = e.clipboard.getData(ClipboardFormats.FILE_LIST_FORMAT) as Array;

                //grab the files file
                var f:File = File(arr[0]);

                //create a FileStream to work with the file
                var fs:FileStream = new FileStream();

                //open the file for reading
                fs.open(f, FileMode.READ);

                //read the file as a string
                var data:String = fs.readUTFBytes(fs.bytesAvailable);

                //close the file
                fs.close();

                //display the contents of the file
                outputField.text = data;
            }
        ]]>
    </fx:Script>


    <mx:TextArea top="10" right="10" bottom="10" left="251"
                 id="outputField" />
    <mx:Text text="Drag a Text File into the Application"
             width="233" height="148" top="11" left="10"/>
</s:WindowedApplication>
于 2012-09-07T17:55:45.480 回答