Android开发实现读取Assets下文件及文件写入存储卡的方法

public String getFromAssets(String fileName) {
    String result = "";
    try {
      InputStream in = 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, ENCODING);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return result;
}

String strEn = getFromAssets("encode.txt");

String[] encode1 = strEn.split(","); 

for(int i=0;i<encode1.length;i++){
  sendString = encode1[i];
  //       sbuf.append(sendString+",");
  try {
    sendBytes = sendString.getBytes("UTF8");
    byte[] s = Base64Encoder.B64Encode(sendBytes);
    str = new String(s, "ISO-8859-1");
  } catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
  sbuf.append(str);
  sbuf.append(",");
}

public String saveInfo2File(String mString) {
    StringBuffer sb = new StringBuffer();
    try {
      long timestamp = System.currentTimeMillis();
      String fileName = "encut" + ".txt";
      if (Environment.getExternalStorageState().equals(
          Environment.MEDIA_MOUNTED)) {
        String spath = Environment.getExternalStorageDirectory()
            .getPath() + "/A1/";
        File sdir = new File(spath);
        if (!sdir.exists())
          sdir.mkdirs();
        FileOutputStream fos = new FileOutputStream(spath + fileName);
        sb.append(mString);
        fos.write(sb.toString().getBytes());
        fos.close();
      }
      return fileName;
    } catch (Exception e) {
    }
    return null;
}