java - Implementing Endless scrolling in Recycler View -

i have recycler view uses asynctask populate ui.

currently retrieves data db , displays in 1 shot,

i want retrieve 15 records in 1 go , after scroll ends want load more 15 records , on...can please help. have pasted code below:

feedactivity.java

package com.bbau.ankit.test_splash;  import android.app.activity; import android.graphics.color; import android.os.asynctask; import android.os.bundle; import android.support.v7.widget.linearlayoutmanager; import android.support.v7.widget.recyclerview; import android.util.log; import android.view.window;  import com.yqritc.recyclerviewflexibledivider.horizontaldivideritemdecoration;  import org.json.jsonarray; import org.json.jsonexception; import org.json.jsonobject;  import java.io.bufferedreader; import java.io.inputstream; import java.io.inputstreamreader; import java.net.httpurlconnection;import java.net.url; import java.util.arraylist; import java.util.list;  /**  * created ankit on 8/14/2015.  */ public class feedlistactivity extends activity {     private static final string tag = "recyclerviewexample";      private list<feeditem> feeditemlist = new arraylist<feeditem>();      private recyclerview mrecyclerview;      private myrecycleradapter adapter;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          /* allow activity show indeterminate progressbar */         requestwindowfeature(window.feature_indeterminate_progress);          setcontentview(r.layout.news);          /* initialize recyclerview */         mrecyclerview = (recyclerview) findviewbyid(r.id.recycler_view);         mrecyclerview.additemdecoration(new horizontaldivideritemdecoration.builder(this).color(color.black).build());         mrecyclerview.setlayoutmanager(new linearlayoutmanager(this));          /*downloading data below url*/         final string url = "http://192.168.170.72/bbau_news.php?before=1&after=5";         new asynchttptask().execute(url);      }      public class asynchttptask extends asynctask<string, void, integer> {          @override         protected void onpreexecute() {             setprogressbarindeterminatevisibility(true);         }          @override         protected integer doinbackground(string... params) {             inputstream inputstream = null;             integer result = 0;             httpurlconnection urlconnection = null;              try {                 /* forming th java.net.url object */                 url url = new url(params[0]);                  urlconnection = (httpurlconnection) url.openconnection();                  /* request */                 urlconnection.setrequestmethod("get");                  int statuscode = urlconnection.getresponsecode();                  /* 200 represents http ok */                 if (statuscode ==  200) {                      bufferedreader r = new bufferedreader(new inputstreamreader(urlconnection.getinputstream()));                     stringbuilder response = new stringbuilder();                     string line;                     while ((line = r.readline()) != null) {                         response.append(line);                     }                      parseresult(response.tostring());                     result = 1; // successful                 }else{                     result = 0; //"failed fetch data!";                 }              } catch (exception e) {                 log.d(tag, e.getlocalizedmessage());             }              return result; //"failed fetch data!";         }          @override         protected void onpostexecute(integer result) {              setprogressbarindeterminatevisibility(false);              /* download complete. lets update ui */             if (result == 1) {                 adapter = new myrecycleradapter(feedlistactivity.this, feeditemlist);                 mrecyclerview.setadapter(adapter);             } else {                 log.e(tag, "failed fetch data!");             }         }     }      private void parseresult(string result) {         try {             jsonobject response = new jsonobject(result);             jsonarray posts = response.optjsonarray("news");              /*initialize array if null*/             if (null == feeditemlist) {                 feeditemlist = new arraylist<feeditem>();             }              (int = 0; < posts.length(); i++) {                 jsonobject post = posts.optjsonobject(i);                  feeditem item = new feeditem();                 item.settitle(post.optstring("news_desc"));                 item.setdescription(post.optstring("date"));                 item.seturl(post.optstring("news"));                 feeditemlist.add(item);             }         } catch (jsonexception e) {             e.printstacktrace();         }     }  } 

myrecycleradapter.java

package com.bbau.ankit.test_splash;  import android.content.context; import android.content.intent; import android.support.v7.widget.recyclerview; import android.text.html; import android.text.style.alignmentspan; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.textview; import android.widget.toast;  import org.w3c.dom.text;  import java.text.parseexception; import java.text.simpledateformat; import java.util.date; import java.util.list;  /**  * created ankit on 8/14/2015.  */ public class myrecycleradapter extends recyclerview.adapter<feedlistrowholder> {        private list<feeditem> feeditemlist;      private context mcontext;      public myrecycleradapter(context context, list<feeditem> feeditemlist) {         this.feeditemlist = feeditemlist;         this.mcontext = context;     }      @override     public feedlistrowholder oncreateviewholder(viewgroup viewgroup, int i) {         view v = layoutinflater.from(viewgroup.getcontext()).inflate(r.layout.list_row, null);         feedlistrowholder mh = new feedlistrowholder(v);         mh.relativelayout.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 log.d("list size", integer.tostring(getitemcount()));                 textview redditurl = (textview) v.findviewbyid(r.id.url);                 string posturl = redditurl.gettext().tostring();                 log.d("the url:", posturl);                 intent intent = new intent(mcontext, webviewactivity.class);                 intent.putextra("url", posturl);                 mcontext.startactivity(intent);             }         });          return mh;     }      @override     public void onbindviewholder(feedlistrowholder feedlistrowholder, int i) {         final feeditem feeditem = feeditemlist.get(i);          feedlistrowholder.title.settext(html.fromhtml(feeditem.gettitle()));         feedlistrowholder.description.settext(feeditem.getdescription());         feedlistrowholder.url.settext(feeditem.geturl());     }      @override     public int getitemcount() {         return (null != feeditemlist ? feeditemlist.size() : 0);     }  } 

of course can use recycler view , endlessscrool combination this..

here sample

private boolean loading = true; int pastvisiblesitems, visibleitemcount, totalitemcount;  mrecyclerview.setonscrolllistener(new recyclerview.onscrolllistener() {     @override     public void onscrolled(recyclerview recyclerview, int dx, int dy) {              visibleitemcount = mlayoutmanager.getchildcount();             totalitemcount = mlayoutmanager.getitemcount();             pastvisiblesitems = mlayoutmanager.findfirstvisibleitemposition();              if (loading) {                 if ( (visibleitemcount + pastvisiblesitems) >= totalitemcount) {                     loading = false;                     log.v("...", "last item wow !");                 }             }      } }); 

don't forget add

linearlayoutmanager mlayoutmanager; mlayoutmanager = new linearlayoutmanager(this); mrecyclerview.setlayoutmanager(mlayoutmanager); 

here github example: endlessrecycleronscrolllistener