Problem for read line from text file external

hi to all.
i am trying to read line from .txt file from my external folder in android,but path is not accessable.my code is like this.

private var stereoValue:String = "";
function Start()
{
  var str1:String = "file:/storage/emulated/0/sdfg.txt";
   var myReader:StreamReader = new StreamReader(str1);
   stereoValue = myReader.ReadLine();
}

problem solved thanks for watch…