/** 从assets 文件夹中读取文本数据 */
        public static String getTextFromAssets(final Context context, String fileName) {
            String result = "";
            try {
                InputStream in = context.getResources().getAssets().open(fileName);
                // 获取文件的字节数
                int lenght = in.available();
                // 创建byte数组
                byte[] buffer = new byte[lenght];
                // 将文件中的数据读到byte数组中
                in.read(buffer);
                result = EncodingUtils.getString(buffer, "UTF-8");
                in.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return result;
        }
       
        /** 从assets 文件夹中读取图片 */
        public static Drawable loadImageFromAsserts(final Context ctx, String fileName) {
            try {
                InputStream is = ctx.getResources().getAssets().open(fileName);
                return Drawable.createFromStream(is, null);
            } catch (IOException e) {
                if (e != null) {
                    e.printStackTrace();
                }
            } catch (OutOfMemoryError e) {
                if (e != null) {
                    e.printStackTrace();
                }
            } catch (Exception e) {
                if (e != null) {
                    e.printStackTrace();
                }
            }
            return null;
        }