Question

我正在尝试使用google api java client library检索YouTube用户的收藏视频。这只是youtube-json-sample的调整。我基本上想要做的是打印用户喜欢的视频列表（特别是打印标题，更新，描述等）。我设法得到列表 - 但问题是所有（标题，描述等）都是空的！这只发生在收藏夹上 - 我用搜索和大多数查看过的查询对它进行了测试，并且它有效。这个奇怪的行为只有收藏夹...这是我的代码：

private  void run() throws IOException {
        YouTubeClient client = new YouTubeClient();
        showVideos(client);
      }

    private VideoFeed showVideos(YouTubeClient client) throws IOException {

        TextView textView = (TextView) findViewById(R.id.textView);
        View.header(textView, "Get Videos");
        YouTubeUrl url = YouTubeUrl.forVideosFeed();
        // execute GData request for the feed
        VideoFeed feed = client.executeGetVideoFeed(url);
        View.display(textView, feed);
        return feed;
      }

public class YouTubeUrl extends GoogleUrl {

  /** Whether to pretty print HTTP requests and responses. */
  private static final boolean PRETTY_PRINT = true;

  static final String ROOT_URL = "https://gdata.youtube.com/feeds/api";



  YouTubeUrl(String encodedUrl) {
    super(encodedUrl);
    this.alt = "jsonc";
    this.prettyprint = PRETTY_PRINT;
  }

  private static YouTubeUrl root() {
    return new YouTubeUrl(ROOT_URL);
  }

  public static YouTubeUrl forVideosFeed() {
    YouTubeUrl result = root();

    result.getPathParts().add("users"); //the URL is http://gdata.youtube.com/feeds/api/users/username/favorites?v=2
    result.getPathParts().add("liorash1"); //some user name
    result.getPathParts().add("favorites");

    return result;
  }
}

public class YouTubeClient {

  private final JsonFactory jsonFactory = new JacksonFactory();

  private final HttpTransport transport = new NetHttpTransport();

  private final HttpRequestFactory requestFactory;

  public YouTubeClient() {
    final JsonCParser parser = new JsonCParser(jsonFactory);
    requestFactory = transport.createRequestFactory(new HttpRequestInitializer() {

      @Override
      public void initialize(HttpRequest request) {
        // headers
        GoogleHeaders headers = new GoogleHeaders();
        headers.setApplicationName("Google-YouTubeSample/1.0");
        headers.gdataVersion = "2";
        request.setHeaders(headers);
        request.addParser(parser);
      }
    });
  }

  public VideoFeed executeGetVideoFeed(YouTubeUrl url) throws IOException {
    return executeGetFeed(url, VideoFeed.class);
  }

  private <F extends Feed<? extends Item>> F executeGetFeed(YouTubeUrl url, Class<F> feedClass)
      throws IOException {
    HttpRequest request = requestFactory.buildGetRequest(url);
    return request.execute().parseAs(feedClass);
  }
}

public class Item {

  @Key
  String title;

  @Key
  DateTime updated;
}

public class Video extends Item {

  @Key
  String description;

  @Key
  List<String> tags = new ArrayList<String>();

  @Key
  Player player;
}

有些课我没有放在这里所以它不会太乱。无论如何，我得到的输出是：

============== Get Videos ==============

Showing first 6 of 8 videos: 

-----------------------------------------------
Title: null
Updated: null

-----------------------------------------------
Title: null
Updated: null

-----------------------------------------------
Title: null
Updated: null

-----------------------------------------------
Title: null
Updated: null

-----------------------------------------------
Title: null
Updated: null

-----------------------------------------------
Title: null
Updated: null

一些更新：

经过一些测试后，我发现我可以获得我测试过的所有Feed（包括用户的上传内容），但收藏夹Feed除外。问题很可能在于JsonCParser：

return request.execute().parseAs(feedClass);

如何使用google api java客户端库检索喜爱的视频？

0 个答案: