I am creating a text file and writing some data into it.the string i want to write in file is written successfully but whenever i want to write the new line (use ) in file it shows some boxes in that notpad file like[][]][]. How can i write the new line character in text file.tell me what i m doing wrong.Here is my code.Thanks in advance.

      try {
        //FileWriter f = new FileWriter("/sdcard/download/possible.txt");
     FileOutputStream fOut = openFileOutput("report.txt",MODE_WORLD_READABLE);
         OutputStreamWriter osw = new OutputStreamWriter(fOut); 
         osw.write("Diet Report"+"
");
         osw.append("
Food Calories Consumed 
");
        osw.append(""+SummaryReportActivity.map.keySet());
    osw.append(""+SummaryReportActivity.map.values());
         osw.append("
");
     osw.append("
Exercise Calories Burnt 
");
    osw.append(""+SummaryReportActivity.exercisemap.keySet());
    osw.append(""+SummaryReportActivity.exercisemap.values());
             osw.append("
");
             osw.append("
Weight Recorded 
");
         osw.append(""+SummaryReportActivity.weightmap.keySet());
                             osw.append(""+SummaryReportActivity.weightmap.values());
         osw.append("
");
         osw.append("
Net Calories Daily 
");
                             osw.append(""+SummaryReportActivity.netCalorie.keySet());
                             osw.append(""+SummaryReportActivity.netCalorie.values());
         osw.flush();
         osw.close();
        FileInputStream fIn = openFileInput("report.txt");
           InputStreamReader isr = new InputStreamReader(fIn);
           char[] inputBuffer = new char[100];
             isr.read(inputBuffer);
           readString = new String(inputBuffer);

        } catch (IOException e) {
                // TODO Auto-generated catch block
                    e.printStackTrace();
            }


//code to mail that text file as an attachement 
    Intent i=new Intent(Intent.ACTION_SEND);
                        //i.putExtra(Intent.EXTRA_EMAIL,emailaddress.getText().toString());
        i.putExtra(Intent.EXTRA_SUBJECT, "Summary report of your diet");
        i.putExtra(Intent.EXTRA_STREAM, Uri.parse("report.txt"));
        i.setType("text/plain");
           startActivity(i);