AlertDialog不止一次显示

Question

到目前为止，我的AlertDialog.Builder始终在s.contains("")时显示3次，而且我也无法找到原因。有人能指出我为什么或帮助我解决这个问题？谢谢。

HashMap postData = new HashMap();
                                postData.put("profileID", profile.getId());
                                AsyncClass task = new AsyncClass(LoginActivity.this, postData, new AsyncResponse() {
                                    @Override
                                    public void processFinish(String s) {
                                        if (!s.equals("")) {
                                            if (s.contains("Customer")) {
                                                Intent in = new Intent(LoginActivity.this, MainActivity.class);
                                                editor.putString("firstname", profile.getFirstName());
                                                editor.putString("surname", profile.getLastName());
                                                editor.putString("imageUrl", profile.getProfilePictureUri(200, 200).toString());
                                                editor.putString("userRole", s);
                                                editor.putString("userName", profile.getId());
                                                editor.putString("name", profile.getName());
                                                editor.apply();
                                                startActivity(in);
                                                finish();
                                            } else if (s.contains("Wingman")) {
                                                Intent in = new Intent(LoginActivity.this, WingmanMainActivity.class);
                                                editor.putString("firstname", profile.getFirstName());
                                                editor.putString("surname", profile.getLastName());
                                                editor.putString("imageUrl", profile.getProfilePictureUri(200, 200).toString());
                                                editor.putString("userRole", s);
                                                editor.putString("userName", profile.getId());
                                                editor.putString("name", profile.getName());
                                                editor.apply();
                                                startActivity(in);
                                                finish();
                                            }
                                        } else if(s.equals("")) {
                                            builderSingle = new AlertDialog.Builder(LoginActivity.this);
                                            builderSingle.setTitle("Select a role: ");

                                            final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(LoginActivity.this, android.R.layout.select_dialog_singlechoice);
                                            arrayAdapter.add("Customer");
                                            arrayAdapter.add("Wingman");

                                            builderSingle.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
                                                @Override
                                                public void onClick(DialogInterface dialog, int which) {
                                                    dialog.dismiss();
                                                }
                                            });

                                            builderSingle.setAdapter(arrayAdapter, new DialogInterface.OnClickListener() {
                                                @Override
                                                public void onClick(DialogInterface dialog, int which) {
                                                    strName = arrayAdapter.getItem(which);
                                                    editor.putString("role", strName);
                                                    editor.apply();

                                                    if (String.valueOf(strName).contains("Wingman")) {
                                                        HashMap postData = new HashMap();
                                                        postData.put("userName", profile.getId());
                                                        postData.put("userRole", strName);
                                                        postData.put("userFirstname", profile.getFirstName());
                                                        postData.put("userLastname", profile.getLastName());
                                                        postData.put("userImage", profile.getProfilePictureUri(200,200).toString());
                                                        postData.put("isWingman","No");
                                                        AsyncClass task = new AsyncClass(LoginActivity.this, postData, true, new AsyncResponse() {
                                                            @Override
                                                            public void processFinish(String s) {
                                                                if (s.contains("success")) {
                                                                    Intent in = new Intent(LoginActivity.this, WingmanMainActivity.class);
                                                                    editor.putString("firstname", profile.getFirstName());
                                                                    editor.putString("surname", profile.getLastName());
                                                                    editor.putString("imageUrl", profile.getProfilePictureUri(200, 200).toString());
                                                                    editor.putString("role", strName);
                                                                    editor.putString("userName", profile.getId());
                                                                    editor.putString("name", profile.getName());
                                                                    editor.apply();
                                                                    startActivity(in);
                                                                    finish();
                                                                }
                                                            }
                                                        });
                                                        task.execute(getString(R.string.link) + "registerFB.php");

                                                    } else if (String.valueOf(strName).contains("Customer")) {
                                                        HashMap postData = new HashMap();
                                                            postData.put("userName", profile.getId());
                                                            postData.put("userRole", strName);
                                                            postData.put("userFirstname", profile.getFirstName());
                                                            postData.put("userLastname", profile.getLastName());
                                                            postData.put("userImage", profile.getProfilePictureUri(200,200).toString());
                                                            AsyncClass task = new AsyncClass(LoginActivity.this, postData, true, new AsyncResponse() {
                                                                @Override
                                                                public void processFinish(String s) {
                                                                    if (s.contains("success")) {
                                                                        Intent in = new Intent(LoginActivity.this, MainActivity.class);
                                                                        editor.putString("firstname", profile.getFirstName());
                                                                        editor.putString("surname", profile.getLastName());
                                                                        editor.putString("imageUrl", profile.getProfilePictureUri(200, 200).toString());
                                                                        editor.putString("role", strName);
                                                                        editor.putString("userName", profile.getId());
                                                                        editor.putString("name", profile.getName());
                                                                        editor.apply();
                                                                        startActivity(in);
                                                                        finish();
                                        }
                                    }
                                });
                                task.execute(getString(R.string.link) + "registerFB.php");
                            }
                        }
                    });
                        builderSingle.show();
                }
            }
        });
        task.execute(getString(R.string.link) + "checkFB.php");