You can use this:
try {
Resources res = getResources();
InputStream in_s = res.openRawResource(R.raw.help);
byte[] b = new byte[in_s.available()];
in_s.read(b);
txtHelp.setText(new String(b));
} catch (Exception e) {
// e.printStackTrace();
txtHelp.setText("Error: can't show help.");
}