csv file android

public static boolean writeCSVFile(String saveFileName) {
        FileWriter fw = null;
        //ObjectOutputStream out = null;
        BufferedWriter out = null;
        Cursor cur = null;

        try {
            File root = Environment.getExternalStorageDirectory();
            cur = mDb.query(DbSchema.SiteSchema.TABLE_NAME, null, null, null, null, null, null, null);

            if(root.canWrite()) {
                fw = new FileWriter(root + "/" + saveFileName);
                out = new BufferedWriter(fw);
                out.write("IP,PORT,LABEL,ACTIVATION_CODE\n");
                while(cur.moveToNext()) {
                    //out.writeObject();
                    String ip = cur.getString(cur.getColumnIndex(DbSchema.SiteSchema.COLUMN_IP));
                    String port = cur.getString(cur.getColumnIndex(DbSchema.SiteSchema.COLUMN_PORT));
                    String label = cur.getString(cur.getColumnIndex(DbSchema.SiteSchema.COLUMN_LABEL));
                    String code = cur.getString(cur.getColumnIndex(DbSchema.SiteSchema.COLUMN_ACTIVATION_CODE));

                    //out.write(ip+","+port+","+label+","+code+"\n");
                    out.write(ip+","+port+","+label+","+code+"\n");
                    //Log.d(LOG_TAG, ip+","+port+","+label+","+code+"\n");
                }
                out.close();
            } else {
                return false;
            }
        } catch (Exception e) {
            Log.d(LOG_TAG, "file write exception: " + e.getMessage());
            return false;
        }

        return true;
    }