读取Android sd卡的文件

private String readFileSdcard(String fileName) {
String verString = "";

try {
FileInputStream fileInputStream = new FileInputStream(fileName);
// System.out.println("可以不受阻塞地从此输入流中读取（或跳过）的估计剩余字节数 字节数："+
// fileInputStream.available());
byte[] buffer = new byte[fileInputStream.available()];

/**
* 拆分字符串 string [] s = strings.split("="); BIG5 UTF-8 UNICODE ISO-8859-1 GBK
*/
fileInputStream.read(buffer);
verString = org.apache.http.util.EncodingUtils.getString(buffer,
"UTF-8").split("=")[1];

fileInputStream.close();

} catch (Exception e) {
e.printStackTrace();
}

return verString;

}