Flex Mobile缺少下載的文件

Question

我正在使用Flex和Flash Builder開發Android應用程序。
我使用以下代碼使用URLLoader和FileStream下載視頻。

public function download():void{
                var loader:URLLoader = new URLLoader();
                loader.dataFormat = URLLoaderDataFormat.BINARY;
                loader.addEventListener(IOErrorEvent.IO_ERROR,function(e:IOErrorEvent):void{
                    progressLabel.text = "Loader IO Error";
                });
                loader.addEventListener(Event.COMPLETE,downloadComplete);
                loader.load(new URLRequest("[MY URL GOES HERE]"));
                progressLabel.text = "Downloading...";
            }
private function downloadComplete(event:Event):void{
                try{
                    var file:File=File.applicationStorageDirectory.resolvePath("file:///mnt/sdcard/MyVideos");

                var ba:ByteArray  = event.target.data as ByteArray;
                var fileStream:FileStream = new FileStream();
                fileStream.addEventListener(IOErrorEvent.IO_ERROR,function(e:IOErrorEvent):void{
                    progressLabel.text = "File IO Error";
                });
                fileStream.open(file, FileMode.WRITE);
                fileStream.writeBytes(ba);
                fileStream.addEventListener(Event.COMPLETE, fileClosed); 
                fileStream.close(); 
                progressLabel.text = "Download Sucessful";
            }
            catch(eeee){
                progressLabel.text = "Error";
            }
        }
        private function fileClosed(event:Event):void {
            openLabel.text = "File Closed";
        }

使用Motorola Xoom進行測試時，它顯示下載成功但文件無法在目錄中找到：
var file：File = File.applicationStorageDirectory.resolvePath（“file：/// mnt / sdcard / MyVideos”）;

Answer 1

使用File.applicationStorageDirectory.resolvePath("MyVideos/video_file.mp4"); 而不是File.applicationStorageDirectory.resolvePath("file:///mnt/sdcard/MyVideos"); 由於安全性違規問題，開發人員只能訪問ApplicationStorageDirectory而不存在任何安全風險。

同時給出文件名MyVideos/video_file.mp4而不是僅文件夾MyVideos 。

var file:File=File.applicationStorageDirectory.resolvePath("MyVideos/video_file.mp4");

if(file.exists)
{
    trace("file exists");
}

喜歡，

private function downloadComplete(event:Event):void
{
    try
      {
        var file:File=File.applicationStorageDirectory.resolvePath("MyVideos/video_file.mp4");

        var ba:ByteArray  = event.target.data as ByteArray;
        var fileStream:FileStream = new FileStream();
        fileStream.addEventListener(IOErrorEvent.IO_ERROR,function(e:IOErrorEvent):void{
            progressLabel.text = "File IO Error";
        });
        fileStream.open(file, FileMode.WRITE);
        fileStream.writeBytes(ba);
        fileStream.addEventListener(Event.COMPLETE, fileClosed); 
        fileStream.close(); 
        progressLabel.text = "Download Sucessful";
        trace(file.nativePath); //Where file actually stored
    }
    catch(eeee){
        progressLabel.text = "Error";
    }
}

在編寫大型文件（如視頻/音樂文件）時， better use ASYNC mode寫入/讀取better use ASYNC mode ，這樣您的應用程序就可以在沒有UI凍結的情