android - 如何在 AIR 中访问存储在 File.applicationStorageDirectory 中的文件，适用于 Android

Question

我有下载简单文本文件并希望在 StageWebView 中显示的 ActionScript 代码。文件下载并成功保存在 File.applicationStorageDirectory 中。我可以将内容输出到控制台，但是，我无法在 StageWebView 中显示该文件。根据我读过的所有内容，这应该可行。 为什么我无法在 Android 上显示我在本地下载并保存的文件？

请注意，我无法更改 StageWebView 以从远程位置打开文件，因为用户需要能够在离线模式下访问该文件。

我也无法将文件存储在 sdcard 上，因为我不想让用户访问该文件。

这是一个示例测试，演示了我正在尝试做的事情。我正在使用 Apache Flex 4.9.0 并部署到 Android 4.1.2

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
           xmlns:s="library://ns.adobe.com/flex/spark" applicationDPI="160" >
<fx:Declarations>
    <!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>

    protected var webView:StageWebView = new StageWebView();
    public static const LOCAL_FILE_STORE:File = File.applicationStorageDirectory;

    protected function onClick(e:Event):void{

        trace("File.applicationStorageDirectory: "+ File.applicationStorageDirectory.nativePath);
        trace("File.desktopDirectory: "+ File.desktopDirectory.nativePath);
        trace("File.applicationDirectory: "+ File.applicationDirectory.nativePath);
        trace("File.documentsDirectory: "+ File.documentsDirectory.nativePath);


        var loader: URLLoader = new URLLoader();
        var request:URLRequest = new URLRequest("http://www.apache.org/dist/flex/4.9.1/README");
        loader.dataFormat= URLLoaderDataFormat.BINARY;
        loader.addEventListener(Event.COMPLETE, completeHandler);
        loader.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
        loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
        loader.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
        try {
            loader.load(request);
        } catch (error:Error) {
            trace("Unable to load requested document.");
        }
    }

    private function completeHandler(event:Event):void {
        var urlLoader:URLLoader = URLLoader(event.target);

        var writeFile:File = File.applicationStorageDirectory.resolvePath("test.txt");

        var writeStream:FileStream = new FileStream();
        writeStream.open(writeFile, FileMode.WRITE);
        writeStream.writeBytes(urlLoader.data);
        writeStream.close();

        //Test if we can output contents to console
        var readStream:FileStream= new FileStream();
        readStream.open(writeFile, FileMode.READ);
        var content:String= readStream.readUTF();
        trace("File Contents: "+ content);

        //Test if we can display file in stagewebview
        var sView:StageWebView= new StageWebView();
        sView.stage= this.stage;
        sView.viewPort= new Rectangle(0, 40, stage.stageWidth, stage.stageHeight);
        sView.addEventListener(ErrorEvent.ERROR, handleError);
        sView.addEventListener(Event.COMPLETE, handleComplete);

        trace("Loading file://"+writeFile.nativePath);
        sView.loadURL("file://"+writeFile.nativePath);
    }

    protected function onError(event:ErrorEvent):void
    {
        trace("UH OHHHH " + event);
    }

    private function ioErrorHandler(event:IOErrorEvent):void {
        trace("ioErrorHandler: " + event);
    }

    private function securityErrorHandler(event:SecurityErrorEvent):void {
        trace("securityErrorHandler: " + event);
    }

    private function httpStatusHandler(event:HTTPStatusEvent):void {
        trace("httpStatusHandler: " + event);
    }

    protected function handleError(event:ErrorEvent):void
    {
        trace("GOT ME AN ERROR: "+ event.errorID + "  "+ event.text);
    }

    protected function handleComplete(event:Event):void
    {
        trace("Done");
    }

]]>

Answer 1

所以肯定是 Apache Flex 4.9.0 有一个 bug，因为当我更新到 Flex 4.9.1 时，上面的代码开始工作了。