as3 Air for Android下载和保存远程文件

Question

The Code below downloads an mp3 to your phone from a server using as3 Air For Android. I want to use these files later in the app so I have the following question:

How can I make it so the files save to a particular folder in the android app rather than a box opening for the user to choose a location?

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);

Would also be sweet to monitor this progress, when it starts, stops and progress but I think an eventListener might work with that.

Answer 1

The Following Code downloads an mp3 from a remote url and makes a folder called .007 (You can change the name or add many or no folders). Then it saves to that location.

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.");
}

PS REMEMBER TO GRANT THE CORRECT PERMISSIONS USING ANDROID IN THE APP

Answer 2

I was looking all over the place for an answer on how to download etc...

What I personally prefer is to download any file with LoaderMax from Greenshocks AS3 library (which is already included in most of my projects since its a kick-ass lightweight loader.

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Instead of specifying a URL which is local i specify a URL which is remote.. lemme show you some code:

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();
}

And below is the handler for the COMPLETE event. You can also have handler for ERROR,FAIL,PROGRESS etc you name it..

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();
}   

Remember LoaderMax does not really care whether the file is local or remote, it just loads it into memory..

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From that point on you can decide whether you want to save it as a file or just use it and then discard it.

If you want to save it as a file here is how: (iOs example below)

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(); 

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