Java包含ArrayList的方法不返回值

Question

我创建了一个包含三个变量的自定义ContactsRow class。我将此类的对象添加到ArrayList 逐个。我想要实现的是，每当我向ArrayList添加新对象时，它应检查该对象是否已添加到列表中。我使用contains()方法来检查相同的内容。但是，当我运行我的应用程序时，从不调用此方法，并且我在列表中获得重复值。

这是我的ContactsRow class：

private class ContactsRow {

        String name, phone;
        Bitmap photo;

        @Override
        public boolean equals(Object obj) {

            if (this == obj)
                return true;

            if ((obj == null) || (obj.getClass() != this.getClass()))
                return false;

            ContactsRow row = (ContactsRow) obj;
            return (name.equals(row.name) || (name != null && name.equals(row.name))) &&
                    (phone.equals(row.phone)  || (phone != null && phone.equals(row.phone))) &&
                    (photo.equals(row.photo) || (photo != null && photo.equals(row.photo)));
        }

        @Override
        public int hashCode() {
            int hash = 7;
            hash = 31 * hash + (name == null ? 0 : name.hashCode());
            hash = 31 * hash + (phone == null ? 0 : phone.hashCode());
            hash = 31 * hash + (photo == null ? 0 : photo.hashCode());

            return hash;
        }

        public ContactsRow(String name, String phone, Bitmap photo) {
            this.name = name;
            this.phone = phone;
            this.photo = photo;
        }
    }

以下是我在ArrayList中添加和检查值的方式：

contactsRow = new ContactsRow(contactName, contactNumber, contact_Photo);

                    if(contactsRowList.contains(contactsRow)){

                        AlertDialog.Builder duplicateBuilder = new AlertDialog.Builder(MyContactsActivity.this);
                        duplicateBuilder.setTitle("Duplicate contact");
                        duplicateBuilder.setMessage("This contact is already added to list. Please choose unique contact");
                        duplicateBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                                Intent intent = new Intent(Intent.ACTION_PICK);
                                intent.setType(ContactsContract.Contacts.CONTENT_TYPE);
                                startActivityForResult(intent, REQUEST_CONTACT);
                                duplicateEntryDialog.dismiss();
                            }
                        });
                        duplicateEntryDialog = duplicateBuilder.create();
                        duplicateEntryDialog.show();

                    } else {
                        contactsRowList.add(contactsRow);
                        contactsInfoAdapter.notifyDataSetChanged();
                    }

永远不会调用此AlertDialog。

任何人都可以帮我识别问题????