FileInputStream fis = null;

fis = openFileInput("a.txt");

    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    byte [] buffer = new byte[1024];

    int len=0;

while((len=fis.read(buffer))!=-1){

baos.write(buffer, 0, len);

    content = baos.toString();

fis.close();

baos.close();

    return content;