private String read( ) {
        FileInputStream in = null;
        BufferedReader reader = null;
        StringBuilder content = new StringBuilder();
        try{
            in =openFileOutput("data");
            reader = new BufferedReader(new InputStreamReader(in));
            String line ="";
            while ((line = reader.readLine()) != null){
                content.append(line);
            }
        }catch (IOException e){
            e.printStackTrace();
        }finally {
            if(reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return content.toString();
    }