Youtube搜索:列表获取PageInfo和nextPageToken空

Question

我正试图使用关键字从YouTube获得视频。我正在使用YouTube API Java库。我可以获得前50条记录成功，但获取下一个记录需要设置nextPageToken。但我得到nextPageToken null。下面是我的代码。

YouTube.Search.List search = youtube.search().list("id,snippet");
search.setOauthToken(credential.getAccessToken());
search.setMaxResults(50L);
search.setQ(keywords); // keywords is string type and input by user.
search.setType("video");
search.setFields("items(id/kind,id/videoId,snippet/title,snippet/thumbnails/default/url)");
VideoList returnList = new VideoList();
    do {
        search.setKey("MYKEY");
        SearchListResponse searchResponse = search.execute();
        // This get 50 items proper.
        List<SearchResult> searchResultList = searchResponse.getItems();

        // Why PageInfo is null? 
        PageInfo pageInfo = searchResponse.getPageInfo();
        // int totalResults = pageInfo.getTotalResults();
        // int pageSize = pageInfo.getResultsPerPage();
        if(searchResponse != null){
            // i use searchResultList and update my database for search.
            ....
            ....
            // PageToken also null.
            String pageToken  = searchResponse.getNextPageToken();
            search.setPageToken(pageToken);
        }
        else{
            break;
        }
    } while (true);
    }catch(Exception ex){
        ex.printStackTrace();
    }

Answer 1

你得到空，因为你没有提到nextpagetoken或pageinfo字段，当显式设置字段时，搜索结果集受到限制。

search.setFields("items(kind,id/kind,id/videoId,snippet/title,snippet/thumbnails/default/url),nextPageToken,pageInfo,prevPageToken");
System.out.println("PAGE INFO: " +response.getPageInfo());
System.out.println("next page token :" +response.getNextPageToken());
System.out.println("prev page token:"+ response.getPrevPageToken());

输出:输入搜索词

扑克脸

PAGE INFO: {"resultsPerPage":2，"totalResults":667891}

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