How to send text via bluetooth

How to send text via bluetooth

I just want to send a text file via bluetooth and I'm using the following
code... but it is showing file not found exception ...
File file = getBaseContext().getFileStreamPath("helloworld.txt");
uri = Uri.fromFile(file);
//to go for bluetooth...
Intent intent=new Intent();
intent.setAction(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(intent);
I have also tried this one
intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new
File("//assets/hello.txt")));
but again it is showing the same exception will u please tell me how to
resolve it...