Reading the opened email attachment on Kindle Fire (android)

Question

To read the data from the attached file I use:

Uri dataUri = getIntent().getData();
ContentResolver cr = getContentResolver();
String readXmlString = "";
try {
    InputStream inputStream = cr.openInputStream(dataUri);
    readXmlString = FileUtils.readFromInputStream(inputStream);
} catch (FileNotFoundException e) {
    e.printStackTrace();
}

On most devices this code works fine, but on Kindle Fire I have a problem. I have debugged it. The problem occurs when content resolver tries to open input stream. So, I have something like this in readXmlString: �۝�+v�(�קi�^����%z��ܩz��ʗ����

The code of my readFromInputStream:

public static String readFromInputStream(InputStream inputStream){
    StringBuilder total = new StringBuilder();
    try {
        BufferedReader r = new BufferedReader(
                new InputStreamReader(inputStream)); //also tried: new InputStreamReader(inputStream, "UTF-8")
        String line;
        while ((line = r.readLine()) != null) {
            total.append(line);
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return total.toString();
}