assetsフォルダのファイル内容を取得

    /**
     * @param fileName
     * @return assets 
     */
    public String getFromAssets(Context context, String fileName) {
        StringBuffer buffer = new StringBuffer();
        try {
            InputStream is = context.getResources().getAssets().open(fileName);
            InputStreamReader inputReader = new InputStreamReader(is);
            BufferedReader bufReader = new BufferedReader(inputReader);
            String line = "";
            while ((line = bufReader.readLine()) != null) {
                buffer.append(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return buffer.toString();
    }