as3 Air for Android 下载和保存远程文件

Question

下面的代码使用 as3 Air For Android 从服务器下载 mp3 到您的手机。我想稍后在应用程序中使用这些文件，所以我有以下问题：

我怎样才能使文件保存到 android 应用程序中的特定文件夹，而不是打开一个框供用户选择位置？

import flash.net.FileReference;

/// It can be an mp3,jpg, png, etc... just change the url
/// and the extension name. nice huh?
var yourFileLocation = "http://YourWeb.com/YourSong.mp3";
var yourFileName = "YourSong.mp3";

var daFile:FileReference = new FileReference();
daFile.download(new URLRequest(yourFileLocation), yourFileName);

监控这个进度也很不错，当它开始、停止和进展时，但我认为 eventListener 可能会与它一起工作。

Answer 1

以下代码从远程 url 下载 mp3 并创建一个名为 .007 的文件夹（您可以更改名称或添加多个文件夹或不添加文件夹）。然后保存到那个位置。

import flash.filesystem.*;
/// Change the line below to point to your mp3 online
var urlString:String = "http://YourWebsite.com/YourSound.mp3";
var urlReq:URLRequest = new URLRequest(urlString);
var urlStream:URLStream = new URLStream();
var fileData:ByteArray = new ByteArray();
urlStream.addEventListener(Event.COMPLETE, loaded);
urlStream.load(urlReq);

function loaded(event:Event):void
{
    urlStream.readBytes(fileData, 0, urlStream.bytesAvailable);
    writeAirFile();
}

function writeAirFile():void
{ 
    // Change the folder path to whatever you want plus name your mp3
    // If the folder or folders does not exist it will create it.
    var file:File = File.userDirectory.resolvePath(".007/Yahoo.mp3");
    var fileStream:FileStream = new FileStream();
    fileStream.open(file, FileMode.WRITE);
    fileStream.writeBytes(fileData, 0, fileData.length);
    fileStream.close();
    trace("The file is written.");
}

附注请记住在应用程序中使用 Android 授予正确的权限

Answer 2

我到处寻找有关如何下载等的答案...

我个人更喜欢从 Greenshocks AS3 库中使用 LoaderMax 下载任何文件（自从它是一个轻量级加载器以来，它已经包含在我的大多数项目中。

---

我没有指定一个本地 URL，而是指定一个远程 URL。 让我给你看一些代码：

public function downloadTxtJpgMp3():void
{
    var queue:LoaderMax = new LoaderMax();
    emptyLoader();    //this emptys the loader from previous attempts to load any files

    queue.append( new DataLoader("http://www.70disco.com/lyrics/delegation_you_and_I.txt",{name:"test_txt" ,format:"text", estimatedBytes:4000})  );
    queue.append( new ImageLoader( "http://4.bp.blogspot.com/-WQ3uAvGdPS0/UOB_OPS6rcI/AAAAAAAAKkU/HYaXXHVHTqc/s1600/whatever-dude-whatever.jpg" , {name:"test_img" , estimatedBytes:77000, container:this, alpha:0, scaleMode:"proportionalInside"}) );
    queue.append( new MP3Loader( "http://nocturno.nsk.pt/otherpages/funny/mp3/2001-02/Cebola%20Mol/Cebola%20Mol%20-%20Satright%20No%20Chaser%20II.mp3" , {name:"test_mp3" , repeat:0, autoPlay: false}) );  

    queue.addEventListener(LoaderEvent.COMPLETE, onDownloadComplete);
    queue.load();
}

下面是 COMPLETE 事件的处理程序。您还可以为您命名的 ERROR、FAIL、PROGRESS 等设置处理程序..

protected function onDownloadComplete(event:LoaderEvent):void
{
    var objects:Array = event.currentTarget.content ;

    var firstObjectILoaded: String      //txt
    var secondObjectILoaded:Bitmap      //jpg
    var thirdObjectILoaded: Sound       //mp3

    // ContentDisplay is found within greenshock

    firstObjectILoaded = objects[0];
    secondObjectILoaded = ((objects[1] as ContentDisplay).rawContent as Bitmap)
    thirdObjectILoaded = objects[2];

    trace(firstObjectILoaded);
    thirdObjectILoaded.play();
}   

请记住，LoaderMax 并不真正关心文件是本地文件还是远程文件，它只是将其加载到内存中..

---

从那时起，您可以决定是将其保存为文件还是仅使用它然后丢弃它。

如果您想将其保存为文件，方法如下：（以下 iOs 示例）

var str:String = File.applicationDirectory.nativePath;

//in iOs you can save on 4 different folder directories (according to apples rules)
// cache, temp, app support, and user documents (i don't cover this below)

appCache = new File(str +"/\.\./Library/Caches");       //cache folder (in which you put files that you dont care being erased. the iOs might delete those files in case of low memory
appTempData = new File(str +"/\.\./tmp");               //temp folder (just files you temporarily want to store
appData = new File(str +"/\.\./Library/Application\ Support");      //any file your application NEEDS in order to operate, this can't be deleted by the os


var fr:FileStream = new FileStream();

fr.open(
    appTempData     //  appTempData or appCache or appData or userDocs
    .resolvePath("myCache.txt"),FileMode.WRITE); 
fr.writeUTFBytes("works");
fr.close(); 

---