不确定如何确保我的代码中的处理程序能够正确运行

Question

以下代码是应用程序注册页面的一部分。我最近问了一个关于我的代码中的错误的问题，我被告知Handler总是在调用onSignupSuccess。如何确保根据布尔emailsuccess的成功或失败，Handler将运行onSignupSuccess和onSignupFailed，或else下的代码声明分别？

    link_login.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent login = new Intent(SignUp.this, Login.class);
            startActivity(login);
        }
    });

    signupbutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            signup();

        }
    });
}

    public void signup() {
        Log.d(TAG, "Signup");

        if(!validate()) {
            onSignupFailed();
            return;

        }

        signupbutton.setEnabled(false);

        final ProgressDialog progressDialog = new ProgressDialog(SignUp.this, R.style.Theme_AppCompat_DayNight_Dialog_Alert);
        progressDialog.setIndeterminate(true);
        progressDialog.setMessage("Creating Account");
        progressDialog.show();



            final String name = inputname.getText().toString();
            final String email = inputemail.getText().toString();
            final String password = inputpassword.getText().toString();
            final int number = Integer.parseInt(inputnumber.getText().toString());

            Response.Listener<String> responseListener = new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    try {
                        JSONObject jsonResponse = new JSONObject(response);
                        boolean emailsuccess = jsonResponse.getBoolean("emailsuccess");

                        if (emailsuccess) {
                            onSignupSuccess();
                            return;
                        }
                        else {
                            onSignupFailed();
                            AlertDialog.Builder cancel = new AlertDialog.Builder(SignUp.this);
                            cancel.setTitle("Registration Failed");
                            cancel.setMessage("Email already in database.");
                            cancel.setNegativeButton("Retry", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    dialog.dismiss();
                                }
                            });
                            cancel.create();
                            cancel.show();
                            return;
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }


                }
            };

            RegisterRequest registerRequest = new RegisterRequest(name, email, password, number, responseListener);
            RequestQueue queue = Volley.newRequestQueue(SignUp.this);
            queue.add(registerRequest);

        new android.os.Handler().postDelayed(
                new Runnable() {
                    public void run() {
                        onSignupSuccess();
                        progressDialog.dismiss();
                    }
                }, 3000);


        }

        public void onSignupSuccess() {
            signupbutton.setEnabled(true);
            setResult(RESULT_OK, null);
            AlertDialog.Builder builder = new AlertDialog.Builder(SignUp.this);
                        builder.setTitle("Registration Successful!");
                        builder.setMessage("A confirmation code has been sent to your email.");
                        builder.setPositiveButton("Next", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                    Intent intent = new Intent(SignUp.this, Confirmation_Sign_Up.class);
                    startActivity(intent);
                     }
                   });
                   builder.create();
                   builder.show();;


        }

        public void onSignupFailed() {
            Toast toast = Toast.makeText(this, "Registration failed", Toast.LENGTH_LONG);
            TextView v = (TextView) toast.getView().findViewById(android.R.id.message);
            v.setTextColor(Color.RED);
            toast.show();

            signupbutton.setEnabled(true);


        }

        public boolean validate() {
            boolean valid = true;

            String name = inputname.getText().toString();
            String email = inputemail.getText().toString();
            String password = inputpassword.getText().toString();
            String number = inputnumber.getText().toString();

            if (name.isEmpty() || name.length() < 2) {
                inputname.setError("Store name must be at least 2 characters");
                valid = false;
            } else {
                inputname.setError(null);
            }

            if (email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
                inputemail.setError("Enter a valid email address");
                valid = false;
            } else {
                inputemail.setError(null);
            }

            if (password.isEmpty() || password.length() < 4 || password.length() > 10) {
                inputpassword.setError("Password must have between 4 and 10 characters");
                valid = false;
            } else {
                inputpassword.setError(null);
            }
            if (number.isEmpty() || number.length() != 8) {
                inputnumber.setError("Enter a valid phone number");
                valid = false;
            } else {
                inputnumber.setError(null);
            }

            return valid;




 }
}

编辑：我删除了处理程序并将ProgressDialog放在try下，但现在ProgressDialog并没有解雇。

try {
                    final ProgressDialog progressDialog = new ProgressDialog(SignUp.this, R.style.Theme_AppCompat_DayNight_Dialog_Alert);
                    progressDialog.setIndeterminate(true);
                    progressDialog.setMessage("Creating Account");
                    progressDialog.show();

                    JSONObject jsonResponse = new JSONObject(response);
                    boolean emailsuccess = jsonResponse.getBoolean("emailsuccess");

                    if (emailsuccess) {
                        progressDialog.dismiss();
                        onSignupSuccess();
                    }
                    else ........