CODE TO SAVE AND READ FROM TEXT FILES

Utility.java

public static void writeStringAsFile(final String fileContents, String fileName) {
        Context context = App.instance.getApplicationContext();
        try {
            FileWriter out = new FileWriter(new File(context.getFilesDir(), fileName));
            out.write(fileContents);
            out.close();
        } catch (IOException e) {
            Logger.logError(TAG, e);
        }
    }

    public static String readFileAsString(String fileName) {
        Context context = App.instance.getApplicationContext();
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        BufferedReader in = null;

        try {
            in = new BufferedReader(new FileReader(new File(context.getFilesDir(), fileName)));
            while ((line = in.readLine()) != null) stringBuilder.append(line);

        } catch (FileNotFoundException e) {
            Logger.logError(TAG, e);
        } catch (IOException e) {
            Logger.logError(TAG, e);
        } 

        return stringBuilder.toString();
    }