Android prompt user input dialog using Parse server

Question

Hey I'am not that good in English sorry.(help)

I am trying using parse Object and dialog prompt. I want to get the value from the text Dialog and asking about it in parse to see if its equal.

If it's equal the dialog sending me to and activity matches the Logon User if it manager/student.

If the code that he writing didn't matches the code in the server i want him to try again but what's happening that the dialog doesn't stop its sending me to and activity matches with the logon even the code text doesn't matches.

This is the code i hope can helping me.

 final EditText editText = (EditText) promptView.findViewById(R.id.editCodeSurvey);
        // setup a dialog window
        alertDialogBuilder.setCancelable(false)
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        String surveyCode = editText.getText().toString();

                        final ParseQuery<ParseObject> query = ParseQuery.getQuery("Field");
                        query.whereEqualTo("codeField", surveyCode);
                        query.findInBackground(new FindCallback<ParseObject>() {
                            @Override
                            public void done(List<ParseObject> list, ParseException e) {
                                if (e != null) {
                                    e.printStackTrace();
                                } else if (list.size() == 0) {
                                    // something went wrong
                                    Toast.makeText(getApplicationContext(), "Make Sure The Code IS Correctly", Toast.LENGTH_SHORT).show();
                                }

                                //After Creating Dialog then we asking if the User that signed in is manager
                                if (parseUser.getBoolean("isManager")) {
                                    //open manager Class
                                    startActivity(new Intent(Login.this, ManagerScreen.class));
                                } else {
                                    //open Student Class to fill the survey
                                    startActivity(new Intent(Login.this, StudentField.class));
                                }

                            }
                        });
                    }
                })
                .setNegativeButton("Cancel",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                dialog.cancel();
                            }
                        });
        // create an alert dialog
        AlertDialog alert = alertDialogBuilder.create();
        alert.show();
         }
     }
       }
   });
 }