Java contains() method of ArrayList does not return value

Question

I have created a custom ContactsRow class containing three variables. I am adding objects of this class to ArrayList one-by-one. What I want to achieve is that, whenever I add new object to ArrayList, it should check if that object is already added to the list. I am using contains() method to check the same. However, when I run my app, this method is never called and I am getting duplicate values in the list.

Here is my 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;
        }
    }

Here is how I am adding and checking values in ArrayList:

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();
                    }

This AlertDialog is never called.

Can anyone help me identify the issue????