How to write text file in Android using Action script 3

dear

i writing simple program under lg optimus installed android 2_3(gingerbread) . cannot access text file or xml file. using flash professional cs5_5. can check program? what's wrong it? works in pc when change path, but  not work in android phone.

 

----------program---------------

import flash.filesystem.*;
import flash.filesystem.filestream;
import flash.events.event;

 

//txtfld standard textfield component

//btnsavefile  standard button component

 

txtfld.text = "start";
btnsavefile.addeventlistener(mouseevent.click,handlerbtnsavefile);
function handlerbtnsavefile(e:event){
  var f:file = new file();
  f.nativepath = "/mnt/sdcard/asdf.txt";
  //f.nativepath.replace(/\//g, file.separator);
 
  var stream:filestream = new filestream();
  stream.open(f, filemode.write);
  txtfld.text = f.nativepath;
 
  stream.writeutfbytes("this text file.");
  stream.close();
   
}

have tried:

 

"stream.open(f, filemode.read)"

 

? (without quotes)

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