i try to delete contact groups by following code.but it does not work.

they are still in contact display options list. how should i do?


                String where = ContactsContract.Data.MIMETYPE + " = ?";
                String[] whereParameters = new String[]
{ GroupMembership.CONTENT_ITEM_TYPE };

                int delete = getContentResolver().delete(
                                ContactsContract.Data.CONTENT_URI, where, 
whereParameters);

                // グループ情報を削除
                int count = getContentResolver().delete(
                                ContactsContract.Groups.CONTENT_URI,
                                ContactsContract.Groups.SYSTEM_ID + " is null 
and "
                                                + ContactsContract.Groups._ID + 
" > "
                                                + GROUP_ID_STARRED_IN_ANDROID, 
null);

                // notify registered observers that a row was updated
        
getContentResolver().notifyChange(ContactsContract.Groups.CONTENT_URI,
                                null);

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