android fragment check send mail finish(android show dialog when mail send success)

I have fragment. when click button,it send mail, but i don't know when mail send success, after i show dialog success. my code send :

 //Intent action send
        Intent email = new Intent(Intent.ACTION_SEND);
        email.putExtra(Intent.EXTRA_EMAIL,
                       new String[]{to});
        email.putExtra(Intent.EXTRA_SUBJECT,
                       "bbbbb");
        email.putExtra(Intent.EXTRA_TEXT,
                       "AAAAAAA"));

        //need this to prompts email client only
        email.setType("message/rfc822");
        getActivity().startActivity(Intent.createChooser(email,
                                                         "Send mail..."));

i want show dialog when mail send success. Please help me. thanks