Android: Sending a Mail/SMS/Tweet with Intent.ACTION_SEND / requestCode / resultCode ?

Question

I'm using the following code :

Intent sendMailIntent = new Intent(Intent.ACTION_SEND); 
        sendMailIntent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.Share_Mail_Subject));
        sendMailIntent.putExtra(Intent.EXTRA_TEXT, getString(R.string.Share_Mail_Text)); 
        sendMailIntent.setType("text/plain");

startActivity(Intent.createChooser(sendMailIntent, "Email / SMS / Tweet ?"));

Then I would like to be able to make the difference between: 1. my user has indeed sent en email/SMS ... OR 2. my user has in fact pushed the BACK BUTTON ... and didn't send anything.

Is there a way to make this difference ?

=> Should I launch the activity with startActivityForResult ? and catch the requestCode/resultCode with onActivityResult ...

=> What king of resultCode should I expect ? how to grab it correctly ? Where should I put these lines of code ? Any snippet of code would be very helpful here.

thanks in advance.

Hub