Android - อยากสอบถามการ Sort file ใน Listview Android ว่าทำยังไงคะ

ftpClient.connect(InetAddress.getByName(server));
ftpClient.login(user, password);
ftpClient.changeWorkingDirectory(serverRoad);
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
BufferedInputStream buffIn=null;
buffIn=new BufferedInputStream(new FileInputStream(file));
ftpClient.enterLocalPassiveMode();
ftpClient.storeFile("test.txt", buffIn);
buffIn.close();
ftpClient.logout();
ftpClient.disconnect();