youtube-api search response (java) -

using youtubeapi of java, made video search. worked using sample of following.

ttps://developers.google.com/youtube/v3/code_samples/java#search_by_keyword

the following data acquired.

{     "items": [         search resource     ] } 

and want "nextpagetoken" , "prevpagetoken". added following code.

searchresponse.getnextpagetoken();

but result "null";

what wrong?

reference: ttps://developers.google.com/youtube/v3/docs/search/list

this code.thanks.

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/* * copyright (c) 2012 google inc. * * licensed under apache license, version 2.0 (the "license"); may not use file except * in compliance license. may obtain copy of license @ * * http://www.apache.org/licenses/license-2.0 * * unless required applicable law or agreed in writing, software distributed under license * distributed on "as is" basis, without warranties or conditions of kind, either express * or implied. see license specific language governing permissions , limitations under * license. */

package com.google.api.services.samples.youtube.cmdline.youtube_cmdline_search_sample;  import com.google.api.client.googleapis.json.googlejsonresponseexception; import com.google.api.client.http.httprequest; import com.google.api.client.http.httprequestinitializer; import com.google.api.client.http.httptransport; import com.google.api.client.http.javanet.nethttptransport; import com.google.api.client.json.jsonfactory; import com.google.api.client.json.jackson2.jacksonfactory; import com.google.api.services.youtube.youtube; import com.google.api.services.youtube.youtube.search; import com.google.api.services.youtube.model.resourceid; import com.google.api.services.youtube.model.searchlistresponse; import com.google.api.services.youtube.model.searchresult; import com.google.api.services.youtube.model.thumbnail;  import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstream; import java.io.inputstreamreader; import java.util.iterator; import java.util.list; import java.util.properties;  /**  * prints list of videos based on search term.  *  * @author jeremy walker  */ public class youtube_sample_2 {    /** global instance properties filename. */   private static string properties_filename = "youtube.properties";    /** global instance of http transport. */   private static final httptransport http_transport = new nethttptransport();    /** global instance of json factory. */   private static final jsonfactory json_factory = new jacksonfactory();    /** global instance of max number of videos want returned (50 = upper limit per page). */   private static final long number_of_videos_returned = 25;    /** global instance of youtube object make api requests. */   private static youtube youtube;     /**    * initializes youtube object search videos on youtube (youtube.search.list). program    * prints names , thumbnails of each of videos (only first 50 videos).    *    * @param args command line args.    */   public static void main(string[] args) {     // read developer key youtube.properties      properties properties = new properties();     try {       inputstream in = search.class.getresourceasstream("/" + properties_filename);       properties.load(in);     } catch (ioexception e) {       system.err.println("there error reading " + properties_filename + ": " + e.getcause()           + " : " + e.getmessage());       system.exit(1);     }     try {       /*        * youtube object used make api requests. last argument required,        * because don't need initialized when httprequest initialized, override        * interface , provide no-op function.        */       youtube = new youtube.builder(http_transport, json_factory, new httprequestinitializer() {         public void initialize(httprequest request) throws ioexception {}       }).setapplicationname("youtube-cmdline-search-sample").build();        // query term user.       string queryterm = getinputquery();        youtube.search.list search = youtube.search().list("id,snippet"); //      system.out.println(search);        /*        * important set developer key google developer console        * non-authenticated requests (found under api access tab @ link:        * code.google.com/apis/). practice , increased quota.        */       string apikey = properties.getproperty("youtube.apikey");        search.setkey(apikey);       search.setq(queryterm);       /*        * searching videos (not playlists or channels). if searching        * more, add them string this: "video,playlist,channel".        */       search.settype("video");       /*        * method reduces info returned fields need , makes calls more        * efficient.        */       search.setfields("items(id/kind,id/videoid,snippet/title,snippet/thumbnails/default/url)");       search.setmaxresults(number_of_videos_returned);       searchlistresponse searchresponse = search.execute();       system.out.println(searchresponse); //      system.out.println(searchresponse.getnextpagetoken()); //      system.out.println(searchresponse.getpageinfo());        list<searchresult> searchresultlist = searchresponse.getitems(); //      system.out.println(searchresultlist);        if (searchresultlist != null) {         prettyprint(searchresultlist.iterator(), queryterm);       }     } catch (googlejsonresponseexception e) {       system.err.println("there service error: " + e.getdetails().getcode() + " : "           + e.getdetails().getmessage());     } catch (ioexception e) {       system.err.println("there io error: " + e.getcause() + " : " + e.getmessage());     } catch (throwable t) {       t.printstacktrace();     }   }    /*    * returns query term (string) user via terminal.    */   private static string getinputquery() throws ioexception {      string inputquery = "";      system.out.print("please enter search term: ");     bufferedreader breader = new bufferedreader(new inputstreamreader(system.in));     inputquery = breader.readline();      if (inputquery.length() < 1) {       // if nothing entered, defaults "youtube developers live."       inputquery = "youtube developers live";     }     return inputquery;   }    /*    * prints out searchresults in iterator. each printed line includes title, id, ,    * thumbnail.    *    * @param iteratorsearchresults iterator of searchresults print    *    * @param query search query (string)    */   private static void prettyprint(iterator<searchresult> iteratorsearchresults, string query) {      system.out.println("\n=============================================================");     system.out.println(         "   first " + number_of_videos_returned + " videos search on \"" + query + "\".");     system.out.println("=============================================================\n");      if (!iteratorsearchresults.hasnext()) {       system.out.println(" there aren't results query.");     }      while (iteratorsearchresults.hasnext()) {        searchresult singlevideo = iteratorsearchresults.next();       resourceid rid = singlevideo.getid();        // double checks kind video.       if (rid.getkind().equals("youtube#video")) {         thumbnail thumbnail = (thumbnail) singlevideo.getsnippet().getthumbnails().get("default");          system.out.println(" video id" + rid.getvideoid());         system.out.println(" title: " + singlevideo.getsnippet().gettitle());         system.out.println(" thumbnail: " + thumbnail.geturl());         system.out.println("\n-------------------------------------------------------------\n");       }     }   } } 

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this propety file.

youtube.properties

youtube.apikey=aizasydlnvt0sjrc4hluwqbilxkgflwbsjsrvjq

user65415642,

i don't know youtube api of java have completed youtube api in app i.e iphone app(ios).

searchstring = [nsstring stringwithformat:@"https://www.googleapis.com/youtube/v3/search?part=snippet&contentdetails&q=%@&type=video&videosyndicated=true&key=%@&maxresults=%d", searchkey,youtube_api_key, results_per_call];

by calling url can response nextpage token