Return to Activity after action completed in Android?

When I start the SMS application using the following methods -- everything works fine up until the point where the message is sent. When I send the message -- it never navigates back to the original activity unless I press the back button. How can I start the SMS activity and then once the message is sent have the parent activity showed again?

This is how I call the SMS app with result.

String message = getMessageString();
    Intent sendIntent = new Intent(Intent.ACTION_SENDTO);
    sendIntent.setData(Uri.parse("sms:" + number));
    sendIntent.putExtra("sms_body", message);
    startActivityForResult(sendIntent, INVITE_COMPLETED);