利用Field获取图片

Field[] fi = R.drawable.class.getDeclaredFields();// 获取文件里的全部对象
        for (int i = 0; i < fi.length; i++) {
            Map<String, Integer> map = new HashMap<String, Integer>();
            try {
                if(fi[i].getName().startsWith("s"))//判断名称是不是以‘s’开头
                map.put("img", fi[i].getInt(R.drawable.class));
            } catch (IllegalAccessException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            list.add(map);