android - ListView items don't load on screen -

the use case following: want load listview inside viewpager , @ same time set onitemclicklistener on list.

can tell why listview doesn't load, i.e. screen stays black. not strip pager works.

layout:

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal" android:orientation="vertical" android:padding="4dip" >  <android.support.v4.view.viewpager     android:id="@+id/pager"     android:layout_width="match_parent"     android:layout_height="0px" >      <android.support.v4.view.pagertitlestrip         android:id="@+id/pager_title_strip"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_gravity="top"         android:layout_weight="1"         android:background="#33b5e5"         android:paddingbottom="4dp"         android:paddingtop="4dp"         android:textcolor="#fff" />      <listview         android:id="@+id/android:list"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:drawselectorontop="false" />  </android.support.v4.view.viewpager> 

some code:

public static class headerfragment extends listfragment {      list<message> messages = new arraylist<message>();     string topic;      public headerfragment(list<message> messages, string topic) {         this.messages = messages;         this.topic = topic;     }      public headerfragment() {         // todo auto-generated constructor stub     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,             bundle savedinstancestate) {          view v = inflater.inflate(r.layout.main, container, false);          final listview listview = (listview) v.findviewbyid(android.r.id.list);          final messageitemadapter adapter = new messageitemadapter(inflater,                 r.layout.headers, messages, 1);           //the click listener.         listview.setonitemclicklistener(new onitemclicklistener() {              @override             public void onitemclick(adapterview<?> parent, view view,                     int position, long id) {                  message message = adapter.getitem(position);                 intent intent = new intent();                 intent.setclassname(                         "main",                         "newsactivity");                 intent.putextra("title", message.gettitle());                 intent.putextra("description", message.getdescription());                 intent.putextra("source", message.getlink().tostring());                 intent.putextra("language", location);                 startactivity(intent);             }         });          listview.setadapter(adapter);          return v;     } 

thanks in advance !!!

edit:

the code calls fragment:

public class headersactivitypageradapter extends fragmentstatepageradapter {      public headersactivitypageradapter(fragmentmanager fm) {         super(fm);     }      @override     public fragment getitem(int i) {          int k = 0;         string topic = null;         list<message> messages = new arraylist<message>();          (entry<string, list<message>> elem : fragmentsdata.entryset()) {             if (k==i)             {                 topic = elem.getkey();                 messages = elem.getvalue();                 break;             }             k++;         }          return new headerfragment(messages, topic);     }      @override     public int getcount() {         return fragmentsdata.size();     }      @override     public charsequence getpagetitle(int position) {         int k = 0;         string topic = "";         (entry<string, list<message>> elem : fragmentsdata.entryset()) {             if (k==position)             {                 topic = elem.getkey();                 break;             }             k++;         }         return topic;     } } 

it works this, lose listener listview:

main.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal" android:orientation="vertical" android:padding="4dip" >  <android.support.v4.view.viewpager     android:id="@+id/pager"     android:layout_width="match_parent"     android:layout_height="0px"     android:layout_weight="1" >      <android.support.v4.view.pagertitlestrip         android:id="@+id/pager_title_strip"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_gravity="top"         android:background="#33b5e5"         android:paddingbottom="4dp"         android:paddingtop="4dp"         android:textcolor="#fff" /> </android.support.v4.view.viewpager> 

submain.xml

<?xml version="1.0" encoding="utf-8"?><linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" >  <framelayout     android:layout_width="match_parent"     android:layout_height="0dip"     android:layout_weight="1" >      <listview         android:id="@android:id/list"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:drawselectorontop="false" /> </framelayout> 

some code:

public static class headerfragment extends listfragment {      list<message> messages = new arraylist<message>();     string topic;      public headerfragment(list<message> messages, string topic) {         this.messages = messages;         this.topic = topic;     }      public headerfragment() {         // todo auto-generated constructor stub     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,             bundle savedinstancestate) {          view v = inflater.inflate(r.layout.submain, container, false);          final listview listview = (listview) v.findviewbyid(android.r.id.list);          final messageitemadapter adapter = new messageitemadapter(inflater,                 r.layout.headers, messages, 1);           //the click listener.         listview.setonitemclicklistener(new onitemclicklistener() {              @override             public void onitemclick(adapterview<?> parent, view view,                     int position, long id) {                  message message = adapter.getitem(position);                 intent intent = new intent();                 intent.setclassname(                         "main",                         "newsactivity");                 intent.putextra("title", message.gettitle());                 intent.putextra("description", message.getdescription());                 intent.putextra("source", message.getlink().tostring());                 intent.putextra("language", location);                 startactivity(intent);             }         });          listview.setadapter(adapter);          return v;     } 

the problem lose listener, doesn't trigger. solution found slows hell down application.

i place listener inside adapter, each item.

your viewpager set height 0px. give larger height , should able see it. perhaps:

<android.support.v4.view.viewpager android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="match_parent" > 

edit:

show code creating fragment , adding screen. add logging constructor:

public headerfragment(list<message> messages, string topic) {     this.messages = messages;     log.i("tag", "messages size: " + this.messages.size(); // <- add     this.topic = topic; } 

to ensure messages has items in when gets passed here. fragment never adds items messages if has none in when create fragment there won't show in listview.