Check if ParseUser exists before signing up

Question

I'm beginner on Android and I'm looking for a way on how can I check if a username exists already in Parse data class(User) in Android.

 btnreg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               ParseUser user = new ParseUser();
                user.setUsername(etmail.getText().toString());
                user.setPassword(etpwd.getEditableText().toString());
                user.put("nom_prenom", etname.getText().toString());
                user.put("tel", ettel.getText().toString());
                user.put("adresse", adresse.getText().toString());
                user.put("sexe", spsexs.getSelectedItem().toString());
                user.put("annee_naissance",spnaissance.getSelectedItem().toString());
                user.put("ville", spville.getSelectedItem().toString());
                user.signUpInBackground(new SignUpCallback() {
                    public void done(ParseException e) {
                        if (e == null) {
                            // Show a simple Toast message upon successful registration



                        } else {
                            alerte("Oupss!!", "Error..." + e.getMessage(), 0);

                        }
                    }


                    public void done(com.parse.ParseException e) {
                        alerte("Succes", "Inscription terminée..", 1);
                    }
                });

I want to check if a username exist in parse : if it exist i want to show an error or a message ("username already taken").

Answer 1

Why do you want do to this ? parse will do that itself for you.

You can track this using ParseException object that you get in SignUpCallback's done method.

Try to get message of that ParseException.