android - downloadUrl returns null Stream -

i'm trying parse rss feed. it's returning null value. debugged & checked. in onpostexecute()- value of result null. here tried code:

here rssfragment.java

    package com.example.samplerssfeed;      import java.io.ioexception;     import java.io.inputstream;     import java.net.httpurlconnection;     import java.net.url;     import java.util.arraylist;     import java.util.list;      import org.xmlpull.v1.xmlpullparserexception;      import android.os.asynctask;     import android.os.bundle;     import android.support.v4.app.fragment;     import android.util.log;     import android.view.layoutinflater;     import android.view.view;     import android.view.viewgroup;     import android.widget.listview;     import android.widget.toast;           public class rssfragment extends fragment {             private listview mlistview;             private static final string url = "https://news.google.com/?output=rss";              @override             public view oncreateview(layoutinflater inflater, viewgroup container,                     bundle savedinstancestate) {                 view view=inflater.inflate(r.layout.fragment_rs, container, false);                 mlistview=(listview)view.findviewbyid(r.id.listview);                 downloadxmltask xmltask=new downloadxmltask();                 xmltask.execute(url);                 return view;              }                private class downloadxmltask extends asynctask<string, void, list<item>>{                  @override                 protected list<item> doinbackground(string... urls) {                     list<item> items = new arraylist<item>();                              try {                                 items=loadxmlfromnetwork(urls[0]);                             } catch (xmlpullparserexception e) {                                 // todo auto-generated catch block                                 e.printstacktrace();                             } catch (ioexception e) {                                 // todo auto-generated catch block                                 e.printstacktrace();                             }                             return items;              }                 @override                 protected void onpostexecute(list<item> result) {                     if(result==null){                         toast.maketext(getactivity(), "parsing faied", toast.length_long).show();                     }                     else{                     rssadapter adapter=new rssadapter(getactivity(),result);                     log.d("parsing", "calling adapter");                     mlistview.setadapter(adapter);                     }                 }          }              private list<item> loadxmlfromnetwork(string urlstring) throws xmlpullparserexception, ioexception{                 inputstream stream=null;                 rssparser rssparser=new rssparser();                 list<item> items=null;                 try {                     stream = downloadurl(urlstring);                             items = rssparser.parse(stream);                 // makes sure inputstream closed after app                 // finished using it.                 } {                     if (stream != null) {                         stream.close();                     }                   }              return items;             }                 // given string representation of url, sets connection , gets                 // input stream.                 private inputstream downloadurl(string urlstring) throws ioexception {                     url url = new url(urlstring);                     httpurlconnection conn = (httpurlconnection) url.openconnection();                     conn.setreadtimeout(10000 /* milliseconds */);                     conn.setconnecttimeout(15000 /* milliseconds */);                     conn.setrequestmethod("get");                     conn.setdoinput(true);                     // starts query                     conn.connect();                     return conn.getinputstream();                 }             } 

this fragment class, in used async task. method items=loadxmlfromnetwork(urls[0]) returning null value

here rssparser.java

 package com.example.samplerssfeed;      import java.io.ioexception;     import java.io.inputstream;     import java.util.arraylist;     import java.util.list;      import org.xmlpull.v1.xmlpullparser;     import org.xmlpull.v1.xmlpullparserexception;      import android.util.xml;      public class rssparser {     private static final string ns=null;     //instantiating pull parser     public list<item> parse(inputstream in) throws xmlpullparserexception,ioexception{         try{             xmlpullparser parser=xml.newpullparser();             parser.setfeature(xmlpullparser.feature_process_namespaces, false);             parser.setinput(in,null);             parser.nexttag();             return reedchannel(parser);          }         finally{             in.close();         }     }      //reading feed     private list<item> reedchannel(xmlpullparser parser) throws xmlpullparserexception, ioexception{         list<item> items = new arraylist<item>();          parser.require(xmlpullparser.start_tag, ns, "channel");         while (parser.next() != xmlpullparser.end_tag) {             if (parser.geteventtype() != xmlpullparser.start_tag) {                 continue;             }             string name = parser.getname();             // starts looking item tag             if (name.equals("item")) {                 items.add(readitem(parser));             } else {                 skip(parser);             }         }           return items;     }           private item readitem(xmlpullparser parser) throws xmlpullparserexception, ioexception{              parser.require(xmlpullparser.start_tag, ns, "item");              string title=null;              string link=null;              string summary=null;              while (parser.next() != xmlpullparser.end_tag) {                     if (parser.geteventtype() != xmlpullparser.start_tag) {                         continue;                     }                     string name = parser.getname();                     if (name.equals("title")) {                         title = readtitle(parser);                     } else if (name.equals("description")) {                         summary = readdescription(parser);                     } else if (name.equals("link")) {                         link = readlink(parser);                     } else {                         skip(parser);                     }                 }                 return new item(title, summary, link);          }          // processes title tags in feed.          private string readtitle(xmlpullparser parser) throws ioexception, xmlpullparserexception {              parser.require(xmlpullparser.start_tag, ns, "title");              string title = readtext(parser);              parser.require(xmlpullparser.end_tag, ns, "title");              return title;          }           // processes link tags in feed.          private string readlink(xmlpullparser parser) throws ioexception, xmlpullparserexception {              string link = "";              parser.require(xmlpullparser.start_tag, ns, "link");              string tag = parser.getname();              string reltype = parser.getattributevalue(null, "rel");                if (tag.equals("link")) {                  if (reltype.equals("alternate")){                      link = parser.getattributevalue(null, "href");                      parser.nexttag();                  }               }              parser.require(xmlpullparser.end_tag, ns, "link");              return link;          }           // processes summary tags in feed.          private string readdescription(xmlpullparser parser) throws ioexception, xmlpullparserexception {              parser.require(xmlpullparser.start_tag, ns, "description");              string summary = readtext(parser);              parser.require(xmlpullparser.end_tag, ns, "description");              return summary;          }           // tags title , summary, extracts text values.          private string readtext(xmlpullparser parser) throws ioexception, xmlpullparserexception {              string result = "";              if (parser.next() == xmlpullparser.text) {                  result = parser.gettext();                  parser.nexttag();              }              return result;          }           private void skip(xmlpullparser parser) throws xmlpullparserexception, ioexception {                 if (parser.geteventtype() != xmlpullparser.start_tag) {                     throw new illegalstateexception();                 }                 int depth = 1;                 while (depth != 0) {                     switch (parser.next()) {                     case xmlpullparser.end_tag:                         depth--;                         break;                     case xmlpullparser.start_tag:                         depth++;                         break;                     }                 }              }         } 

here rssadapter.java

package com.example.samplerssfeed;  import java.util.list;  import android.content.context; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.arrayadapter; import android.widget.textview;  public class rssadapter extends arrayadapter<item>{    private list<item> mitems;    private context mcontext;    private layoutinflater minflater;     public rssadapter(context context, list<item> items) {         super(context, r.layout.rss_items, items);         mcontext=context;         mitems=items;         minflater=(layoutinflater) mcontext.getsystemservice(context.layout_inflater_service);     }     private static class rssholder{         textview mtextview1,mtextview2;      }     @override     public view getview(int position, view convertview, viewgroup parent) {          rssholder holder;          if (convertview == null) {             holder = new rssholder();             convertview = minflater.inflate(r.layout.rss_items, parent,                     false);             holder.mtextview1 = (textview) convertview                     .findviewbyid(r.id.textview1);             holder.mtextview2 = (textview) convertview                     .findviewbyid(r.id.textview2);             log.d("parsing", "setting listview");             convertview.settag(holder);         } else {             holder = (rssholder) convertview.gettag();         }         string title=mitems.get(position).tostring();         string description=mitems.get(position).tostring();         holder.mtextview1.settext(title);         holder.mtextview2.settext(description);         log.d("parsing", "return views");          return convertview;     }  } 

here item.java

 package com.example.samplerssfeed;      public  class item {          public final string title;          public final string link;          public final string summary;          public item(string title,string link,string summary){              this.title=title;              this.link=link;              this.summary=summary;           }     } 

can tell me why returning null value

my log cat entries:

06-03 04:57:14.848: d/dalvikvm(385): gc_for_alloc freed 846k, 22% free 6130k/7804k, paused 263ms, total 275ms 06-03 04:57:15.258: d/androidruntime(2959): >>>>>> androidruntime start com.android.internal.os.runtimeinit <<<<<< 06-03 04:57:15.268: d/androidruntime(2959): checkjni on 06-03 04:57:15.638: d/dalvikvm(2959): trying load lib libjavacore.so 0x0 06-03 04:57:15.678: d/dalvikvm(2959): added shared lib libjavacore.so 0x0 06-03 04:57:15.748: d/dalvikvm(2959): trying load lib libnativehelper.so 0x0 06-03 04:57:15.758: d/dalvikvm(2959): added shared lib libnativehelper.so 0x0 06-03 04:57:15.758: d/dalvikvm(2959): no jni_onload found in libnativehelper.so 0x0, skipping init 06-03 04:57:15.928: d/lightsservice(385): excessive delay setting light: 1003ms 06-03 04:57:16.438: w/recognitionmanagerservice(385): no available voice recognition services found user 0 06-03 04:57:16.778: d/dalvikvm(2959): note: class landroid/app/activitymanagernative; has 179 unimplemented (abstract) methods 06-03 04:57:16.848: d/dalvikvm(544): gc_for_alloc freed 577k, 37% free 4677k/7324k, paused 146ms, total 157ms 06-03 04:57:16.968: i/choreographer(544): skipped 304 frames!  application may doing work on main thread. 06-03 04:57:27.448: d/androidruntime(2968): >>>>>> androidruntime start com.android.internal.os.runtimeinit <<<<<< 06-03 04:57:27.478: d/androidruntime(2968): checkjni on 06-03 04:57:27.678: d/dalvikvm(2968): trying load lib libjavacore.so 0x0 06-03 04:57:27.688: d/dalvikvm(2968): added shared lib libjavacore.so 0x0 06-03 04:57:27.748: d/dalvikvm(2968): trying load lib libnativehelper.so 0x0 06-03 04:57:27.748: d/dalvikvm(2968): added shared lib libnativehelper.so 0x0 06-03 04:57:27.748: d/dalvikvm(2968): no jni_onload found in libnativehelper.so 0x0, skipping init 06-03 04:57:28.338: d/dalvikvm(2968): note: class landroid/app/activitymanagernative; has 179 unimplemented (abstract) methods 06-03 04:57:29.648: e/memtrack(2968): couldn't load memtrack module (no such file or directory) 06-03 04:57:29.648: e/android.os.debug(2968): failed load memtrack module: -2 06-03 04:57:30.278: d/androidruntime(2968): calling main entry com.android.commands.pm.pm 06-03 04:57:30.448: d/androidruntime(2968): shutting down vm 06-03 04:57:30.468: d/dalvikvm(2968): debugger has detached; object registry had 1 entries 06-03 04:57:31.728: d/androidruntime(2979): >>>>>> androidruntime start com.android.internal.os.runtimeinit <<<<<< 06-03 04:57:31.738: d/androidruntime(2979): checkjni on 06-03 04:57:31.928: d/dalvikvm(2979): trying load lib libjavacore.so 0x0 06-03 04:57:31.938: d/dalvikvm(2979): added shared lib libjavacore.so 0x0 06-03 04:57:32.018: d/dalvikvm(2979): trying load lib libnativehelper.so 0x0 06-03 04:57:32.018: d/dalvikvm(2979): added shared lib libnativehelper.so 0x0 06-03 04:57:32.028: d/dalvikvm(2979): no jni_onload found in libnativehelper.so 0x0, skipping init 06-03 04:57:32.528: d/dalvikvm(2979): note: class landroid/app/activitymanagernative; has 179 unimplemented (abstract) methods 06-03 04:57:33.858: e/memtrack(2979): couldn't load memtrack module (no such file or directory) 06-03 04:57:33.858: e/android.os.debug(2979): failed load memtrack module: -2 06-03 04:57:34.518: d/androidruntime(2979): calling main entry com.android.commands.am.am 06-03 04:57:34.688: i/activitymanager(385): start u0 {act=android.intent.action.main cat=[android.intent.category.launcher] flg=0x10000000 cmp=com.example.samplerssfeed/.rssactivity} pid 2979 06-03 04:57:34.778: d/gralloc(49): registering buffer in process created it. may cause memory ordering problems. 06-03 04:57:34.778: e/libegl(49): called unimplemented opengl es api 06-03 04:57:34.788: e/libegl(49): called unimplemented opengl es api 06-03 04:57:34.788: e/libegl(49): called unimplemented opengl es api 06-03 04:57:34.788: e/libegl(49): called unimplemented opengl es api 06-03 04:57:34.788: e/surfaceflinger(49): glcheckframebufferstatusoes error 1945814895 06-03 04:57:34.788: e/surfaceflinger(49): got gl_framebuffer_complete_oes error while taking screenshot 06-03 04:57:34.788: e/libegl(49): called unimplemented opengl es api 06-03 04:57:34.788: e/libegl(49): called unimplemented opengl es api 06-03 04:57:34.828: w/windowmanager(385): screenshot failure taking screenshot (164x246) layer 21010 06-03 04:57:34.928: d/androidruntime(2979): shutting down vm 06-03 04:57:34.948: d/jdwp(2979): got wake-up signal, bailing out of select 06-03 04:57:34.948: d/dalvikvm(2979): debugger has detached; object registry had 1 entries 06-03 04:57:35.088: i/activitymanager(385): start proc com.example.samplerssfeed activity com.example.samplerssfeed/.rssactivity: pid=2990 uid=10067 gids={50067, 3003} 06-03 04:57:35.158: d/dalvikvm(2990): not late-enabling checkjni (already on) 06-03 04:57:35.218: i/choreographer(385): skipped 47 frames!  application may doing work on main thread. 06-03 04:57:35.538: i/choreographer(385): skipped 43 frames!  application may doing work on main thread. 06-03 04:57:35.648: i/dalvikvm(2990): checkjni enabled: not enabling jni app bug workarounds. 06-03 04:57:36.108: i/choreographer(385): skipped 66 frames!  application may doing work on main thread. 06-03 04:57:36.228: i/choreographer(385): skipped 30 frames!  application may doing work on main thread. 06-03 04:57:36.338: i/choreographer(385): skipped 63 frames!  application may doing work on main thread. 06-03 04:57:36.448: i/choreographer(385): skipped 66 frames!  application may doing work on main thread. 06-03 04:57:37.498: i/choreographer(2990): skipped 145 frames!  application may doing work on main thread. 06-03 04:57:37.548: d/gralloc_goldfish(2990): emulator without gpu emulation detected. 06-03 04:57:37.678: i/activitymanager(385): displayed com.example.samplerssfeed/.rssactivity: +2s714ms 06-03 04:57:37.778: i/choreographer(2990): skipped 51 frames!  application may doing work on main thread. 06-03 04:57:37.788: i/choreographer(385): skipped 39 frames!  application may doing work on main thread. 06-03 04:57:37.908: i/choreographer(385): skipped 43 frames!  application may doing work on main thread. 06-03 04:57:37.998: i/choreographer(385): skipped 40 frames!  application may doing work on main thread. 06-03 04:57:38.258: d/dalvikvm(2990): gc_for_alloc freed 83k, 5% free 3128k/3276k, paused 207ms, total 213ms 06-03 04:57:41.768: d/httpexample(2990): response is:200 06-03 04:57:41.838: d/dalvikvm(2990): gc_for_alloc freed 373k, 12% free 3259k/3700k, paused 57ms, total 57ms 06-03 04:57:42.638: d/lightsservice(385): excessive delay setting light: 69ms 06-03 04:57:42.818: d/lightsservice(385): excessive delay setting light: 178ms 06-03 04:57:42.948: d/lightsservice(385): excessive delay setting light: 103ms 06-03 04:57:43.038: d/lightsservice(385): excessive delay setting light: 64ms 06-03 04:57:43.398: d/dalvikvm(2990): gc_for_alloc freed 487k, 15% free 3275k/3832k, paused 45ms, total 46ms 06-03 04:57:43.478: d/parsing(2990): calling adapter 06-03 04:58:00.178: i/choreographer(544): skipped 38 frames!  application may doing work on main thread. 06-03 04:58:35.628: d/lightsservice(385): excessive delay setting light: 82ms 06-03 04:58:35.678: d/lightsservice(385): excessive delay setting light: 54ms 06-03 04:58:35.788: d/lightsservice(385): excessive delay setting light: 69ms 06-03 04:58:35.908: d/lightsservice(385): excessive delay setting light: 102ms 06-03 05:00:01.018: d/connectivityservice(385): sampling interval elapsed, updating statistics .. 06-03 05:00:01.068: d/connectivityservice(385): done. 06-03 05:00:01.078: d/connectivityservice(385): setting timer 720seconds 06-03 05:04:27.788: d/dalvikvm(944): gc_for_alloc freed 845k, 15% free 5225k/6140k, paused 66ms, total 67ms 06-03 05:04:36.198: d/dalvikvm(523): gc_for_alloc freed 591k, 17% free 3240k/3900k, paused 48ms, total 50ms 

this seems culprit:

items = rssparser.parse(stream); 

perhaps, parse seems return null.