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//write from file
try {
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("abc.txt",MODE_PRIVATE));
            outputStreamWriter.write(message);
            outputStreamWriter.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
//read from file        
        String result = "";
        InputStream inputStream = openFileInput("abc.txt");
        if (inputStream != null){
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String tempResult = "";
            StringBuilder stringBuilder = new StringBuilder();
            while ((tempResult = bufferedReader.readLine())!=null){
                stringBuilder.append(tempResult);
            }
            inputStream.close();
            result = stringBuilder.toString();

        }