Model json

    public List<Month> months = new ArrayList<Month>();

    public void saveMonths(Context context) {
        Gson gson = new Gson();
        String gsonOutput = gson.toJson(this.months, ArrayList.class);
        FileOutputStream fos;
        try {
            if (context.getFileStreamPath(MONTHS_FILE).exists())
                context.deleteFile(MONTHS_FILE);
            fos = context.openFileOutput(MONTHS_FILE, Context.MODE_PRIVATE);
            fos.write(gsonOutput.getBytes());
            fos.close();
        } catch (FileNotFoundException e) {
            Log.e(e);
        } catch (IOException e) {
            Log.e(e);
        }
    }

    public void restoreMonths(Context context) {
        Gson gson = new Gson();
        try {
            this.months = gson.fromJson(new InputStreamReader(context.openFileInput(MONTHS_FILE)), new TypeToken<List<Month>>() {
            }.getType());
        } catch (JsonSyntaxException e) {
            Log.e(e);
        } catch (JsonIOException e) {
            Log.e(e);
        } catch (FileNotFoundException e) {
            Log.e(e);
        }
    }